National Grid ESO
L o a d i n g
National Grid Electricity System Operator (ESO) is the transmission system operator, working to balance supply and demand in real time, as well as coordinating markets and auctions which ensure sufficient future supply, and exploring initiatives such as demand-side response measures to reduce peaks in electricity demand.
Available DatasetsShowing 134 of 134 results
- National Energy System Operator (NESO) trades on interconnectors to adjust the flow of electricity into or out of Great Britain to help manage system issues such as thermal, voltage or stability constraints or to manage energy requirements such as upwards and downwards margin. Trades can take place on IFA1, BritNed, NEMO, IFA2, ElecLink and Viking Link interconnectors. We invite qualified counterparties into NESO Interconnector (IC) auctions which run ad hoc across the day. The counterparties, who hold respective interconnector capacity or be able to secure the capacity later on, can bid in the auction based on the requirement. Requirements are not firm and are subject to change depending on prevailing system conditions. When the auction has been concluded, the information for a given requirement (lot) will be updated to include the volumes secured on each interconnector, the best price, the volume-weighted average price (VWA), and the clearing price. The requirement may not be completely filled. To participate in this market, a counterparty is required to have a Grid Trade Master Agreement (GTMA) in place with NESO and to have access to capacity on channel interconnectors, along with being registered with the BSC party. OTF Dates - Featuring Trading At various times of the year members of the trading team are invited along to the OTF to provide a deep dive or insight into our day job. Here are some of the OTF dates the trading team have attended: 6th July - DA trading on Eleclink click here 27th July - High cost trading days click here 17th August - CMN and trading data locations click here 5th October - Overview of how we trade click here >**NOTE:** Documentation relating to interconnector trading, including the procurement framework and supporting materials: Interconnector Trading Procurement Framework1Licence not specified10 months ago
- The dataset contains national and BMU wind forecast over a day ahead timescale as well as all historic day ahead wind forecasts to assist the industry to make efficient decisions in balancing their supply and demand positions.1Licence not specified10 months ago
- As part of Clean Energy Package (CEP) 6.9 we will be running daily auction for procurement of Short Term Operating Reserve (STOR). The daily results from the auction are available here.1Licence not specified10 months ago
- This dataset contains national carbon intensity forecast for the GB electricity system. The carbon intensity of electricity is a measure of how much CO2 emissions are produced per kilowatt hour of electricity consumed.1Licence not specified10 months ago
- This dataset contains country carbon intensity forecast for the GB electricity system.The carbon intensity of electricity is a measure of how much CO2 emissions are produced per kilowatt hour of electricity consumed.1Licence not specified10 months ago
- There is a file for each run type we calculate a BSUoS charge for - Interim Initial (II), Settlement Final (SF) and Reconciliation Final (RF). These are updated daily with the actual Half Hourly BSUoS price. Total costs and volume information by settlement period is also published here. >**NOTE:** We have paused the billing due to system outage from 26/04/2024 to 20/05/2024 (inclusive) and during this period there will be no BSUoS web prices issued. The outage has been extended now until 27/05/2024, the billing will resume on 28/05/2024 and the data will be published on daily basis. Please find the link for more information.1Licence not specified10 months ago
- The BSUoS charge recovers the cost of day-to-day operation of the transmission system. Generators and suppliers are liable for these charges, which are calculated daily as a flat tariff for all users. Historical values of these charges, on a daily basis in a annual file, are provided here. There are a few missing dates and/or settlement periods from the years below under investigation.1Licence not specified10 months ago
- A snapshot of the limits and flows at relevant boundaries at day ahead stage. These flow values are true for when the measurement was taken and will not reflect any changes in the flows following the publication of this data. The network diagrams show the constraint boundaries and arrows indicating the positive direction of power flow across each boundary.1Licence not specified10 months ago
- A list of projects that hold contracts for Transmission Entry Capacity (TEC) with us. These include existing and future connection projects and projects that can be directly connected to the National Electricity Transmission System (NETS), or make use of it.1Licence not specified10 months ago
- The dataset contains national and windfarm-level 0-14 Day Ahead wind forecasts for all the windfarms which provide real-time operational metering (SCADA telemetry) to the NESO. The forecasts are based on evaluated Operational Capacity, which is a deterministic value based on recent actual production levels of that windfarm, captured from SCADA telemetry.1Licence not specified10 months ago
- Balancing Services Adjustment Data (BSAD) is used to submit balancing actions to the Balancing & Settlement Code (BSC), which defines the rules and governance for the balancing mechanism and imbalance settlement processes of electricity in Great Britain. BSAD covers actions taken outside of the balancing mechanism. >The BSAD methodology statement can be found here: [https://www.nationalgrideso.com/document/110891/download](https://www.nationalgrideso.com/document/110891/download)1Licence not specified10 months ago
- The dataset contains forecasts of our Dynamic Containment Low and High requirements for the next 4-days. The methodology uses forecasted demand, inertia, and response volumes as well as a view of the largest losses on the system to estimate the DC requirements. The actual requirements day-ahead are likely to change based on optimisation carried out closer to real-time coupled with greater visibility of inertia, demand, and loss sizes. For example, changes to interconnector flows from our forecasted position can lead to either an increase or decrease in our requirements if the change impacts the largest loss we need to secure.1Licence not specified10 months ago
- A new dataset to calculate Skip Rates using the methodology developed with LCP Delta. For more information on this methodology see the Skip Rate section of the website. This dataset provides the skip rates per 30mins of each day following each stage of exclusions as set out in the methodology on the website.1Licence not specified10 months ago
- The Balancing Services Use of System (BSUoS) costs are reported on a monthly basis with a forecast for the next month and a rolling 24 month period. Here you can find the data for the 24 month ahead forecast. **Disclaimer**: This forecast is published without prejudice and whilst every effort has been made to ensure the accuracy based on the assumptions and models used, it is subject to several estimations and forecasts and may not bear relation to either the indicative or actual tariffs Electricity system Operator will publish at a later date.1Licence not specified10 months ago
- This dataset contains regional carbon intensity forecast for the GB electricity system.The carbon intensity of electricity is a measure of how much CO2 emissions are produced per kilowatt hour of electricity consumed.1Licence not specified10 months ago
- This dataset gives indicative information on the availability and utilisation of Stability Pathfinder contracts. The information is provided at a settlement period resolution for all contracted units. Time values are all given in local time in GB.1Licence not specified10 months ago
- These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per hourly time period. >**NOTE:** Final interconnector capacity is calculated using these NESO values, values from the connected SO and the interconnector capability. Therefore, the interconnector’s final capacity value may be lower than the NESO values shown here. The final values can be found on each interconnector’s trading facilitator’s website. Values will only be published where a restriction has been applied by NESO. If there are no values, NESO has not applied a restriction.1Licence not specified10 months ago
- A list of interconnector projects that hold connection contracts with NESO. These include active interconnectors and future interconnector projects. **Note**: The Mega Watt (MW) Total MW Import figures represent firm Transmission Entry Capacity (TEC). Moyle holds a total of 500MW TEC which is subject to operational restrictions **CUSC Definitions** Connection and Use of System Code (CUSC) Definition paragraph 9.4 *EXPORT OF POWER FROM THE INTERCONNECTOR CONNECTION SITE* * MW Import: Subject to the other provisions of the CUSC, the relevant Bilateral Connection Agreement and the Grid Code and any Operating Agreement, The Company shall accept into the National Electricity Transmission System at the connection site of an Interconnector power up to the Transmission Entry Capacity and (if any) Short-Term Transmission Entry Capacity (STTEC) and\or Limited Duration Transmission Entry Capacity (LDTEC) and\or any Temporary Received TEC less any Temporary Donated TEC for the relevant Period as specified in Appendix C to the relevant Bilateral Connection Agreement except to the extent (if any) that The Company is prevented from doing so by transmission constraints which could not be avoided by the exercise of Good Industry Practice. CUSC Definition paragraph *9.5 IMPORT OF POWER TO THE INTERCONNECTOR CONNECTION SITE* * MW Export: Subject to the other provisions of the CUSC, the relevant Bilateral Connection Agreement, the Grid Code and any Operating Agreement, The Company shall transport a supply of power to a Connection Site of an Interconnector through the National Electricity Transmission System up to the amount specified in the Bilateral Connection Agreement except to the extent (if any) that The Company is prevented from doing so by transmission constraints which could not be avoided by the exercise of Good Industry Practice by The Company.1Licence not specified10 months ago
- The number of voltage machine required for a given voltage group for upcoming weekend and following Monday to Friday. Given the complexity and locational nature of the voltage requirement, the actual requirement is likely to change, also further optimisation can be carried out towards real time based on the market condition, unit running pattern, demand and supply fundamentals.1Licence not specified10 months ago
- As part of our daily planning processes within the ESO control room, the control room strategy team produces a System Operating Plan (SOP) at key demand peaks or troughs throughout the day, at what we call a Cardinal Point (CP). Prior to each CP the Strategy team hand over the relevant SOP to the real-time Energy team, who then use this plan to take real-time operational decisions to balance the electricity system. The SOP is a snapshot of key information that is available to the ENCC at that time of its creation and based on this information provides a flexible strategic plan to ensure the ESO fulfills all its obligations to balance the system. The information within the SOP ensures that the most economic, secure, and flexible plan is developed for that moment in time at the time of handover. The real-time energy team constantly reviews the information within the SOP to ensure it is still relevant as they approach the CP, so that to ensure the operational plan is still valid, and if required modify as needed. On this page, we aim to publish the following SOPs every day ahead of the respective cardinal point: 1A, 1B, 2F/A/B (whichever is the peak of the morning), 3B, 3C & 4B. For further background on the SOP please view our [Introduction to SOPs document](https://www.nationalgrideso.com/data-portal/system-operating-plan-sop/an_introduction_to_system_operator_plans), additionally, you can find explanations of the terms used in the SOP in our [SOP Glossary document](https://www.nationalgrideso.com/data-portal/system-operating-plan-sop/glossary_of_terms_used_in_system_operating_plan). >**NOTE:** We are currently experiencing issues with the quality of the published SOP data in the Data Portal. Our team is actively investigating the matter and working towards a resolution. We apologize for any inconvenience this may have caused.1Licence not specified10 months ago
- A set of auction result views which present the outcome of daily Balancing Reserve (BR) auction runs. The EAC-BR Auction Results are updated daily in the morning and are available in the listed resources below.1Licence not specified10 months ago
- This dataset is a component of the Forward Plan 2020-21 commitment to increase the transparency of our operational decision making in the Balancing Mechanism (BM). It includes the publication of actions taken in the BM, reasons for them and includes a methodology document for the process.1Licence not specified10 months ago
- This dataset displays all upcoming electricity trades due to be delivered. To meet our forecast balancing requirements at minimum cost, we trade energy-related products. The data is refreshed every ten minutes. The trade details should be considered provisional and subject to correction in particular following the usual trade confirmation process with the counterparty, and should not therefore be relied upon. We draw your attention to the disclaimers in our terms and conditions. >**NOTE:** We are currently experiencing difficulties with updating the dataset. Our dedicated team is actively investigating the issue to address it as soon as possible. We apologize for any inconveniences this may cause and appreciate your patience while we work towards a resolution.1Licence not specified10 months ago
- National Energy System Operator (NESO) publishes at a half-hourly resolution the embedded (refer to embedded document for definition) wind and solar forecast from within day up to 14 days ahead. This forecast gets updated on an hourly basis.1Licence not specified10 months ago
- This dataset contains national electricity demand forecast for day ahead as well as all historic day ahead demand forecasts. The forecast assists the industry to make efficient decisions in balancing their supply and demand positions.1Licence not specified10 months ago
- This dataset contains an estimate of the outturn inertia and market provided inertia for Great Britain Transmission System.1Licence not specified10 months ago
- This section contains historic electricity demand, interconnector, hydro storage pumping, Non-BM Short Term Operating Reserve (STOR), wind and solar outturn data.1Licence not specified10 months ago
- This dataset contains data for historic GTMA (Grid Trade Master Agreement) trades conducted since April 2015. The data includes the trade ID, start and end time and date, the volume in MW, the price in £/MWh and the total cost of the trade. The dataset will be updated on a monthly basis shortly after the start of the month, with the previous months data. The live data file is refreshed every morning to capture the trades occurred between D-1 06:00 and D 06:00. However post-delivery things can change, for example counterparties can default (not deliver the trade) and in this event the data may not be updated retrospectively. OTF Dates - Featuring Trading At various times of the year members of the trading team are invited along to the OTF to provide a deep dive or insight into our day job. Here are some of the OTF dates the trading team have attended: 6th July - DA trading on Eleclink click here 27th July - High cost trading days click here 17th August - CMN and trading data locations click here 5th October - Overview of how we trade click here1Licence not specified10 months ago
- OPMR is the amount of generation exceeding the demand forecast needed to meet our reserve requirement. When assessing and publishing generation availability information against system requirements, the ESO includes an OPMR above demand forecast for 2-13 days ahead.1Licence not specified10 months ago
- To give greater insight on balancing decisions, this post monthly report provides outturn system costs for maintaining voltage levels on the network. Maintaining the electricity system at the correct voltages enables safe and efficient power transfer across the network. This requires the right balance of reactive power injection and absorption to be maintained in real time. > **Note:** Please note the utilisation costs presented here are only the ORPS payments, allocated per voltage constraint group. The historical years 2019-20, 2020-21, 2021-22 have recently been revised, as has the current year file.1Licence not specified10 months ago
- The carbon intensity of electricity measures how much carbon dioxide emissions are produced per kilowatt hour. This dataset contains data from 1 January 2009. It has seasonal decomposition applied to correct missing or irregular data points. The data is subject to change due to a data cleansing process taking place to provide the most accurate figures.1Licence not specified10 months ago
- These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per hourly time period. >**NOTE:** Final interconnector capacity is calculated using these NESO values, values from the connected SO and the interconnector capability. Therefore, the interconnector’s final capacity value may be lower than the NESO values shown here. The final values can be found on each interconnector’s trading facilitator’s website. Values will only be published where a restriction has been applied by NESO . If there are no values, NESO has not applied a restriction.1Licence not specified10 months ago
- This dataset contains national electricity demand forecast for 2 days ahead as well as all historic 2 day ahead demand forecasts. The forecast assists the industry to make efficient decisions in balancing their supply and demand positions.1Licence not specified10 months ago
- Demand Flexibility Service (DFS) allows the NESO to access additional flexibility. Email alerts are available for this dataset once subscribed, triggered by any modification to the files. The auction results will now be published below. The previous results page will no longer be updated, but will be retained to share historical data.1Licence not specified10 months ago
- Metered wind output in MW for Scotland, England, and Wales. Output is provided per date per settlement period. Please note that this data is from operational metering and is therefore expected to be different to the data published as part of the wind forecasting metrics, as that data uses settlement metering which will be subject to reconciliation.1Licence not specified10 months ago
- The obligatory reactive power service (ORPS) is the provision of varying reactive power output. At any given output generators may be requested to produce or absorb reactive power to help manage system voltages close to its point of connection. All generators covered by the requirements of the Grid Code are required to have the capability to provide reactive power. Provided here is data on utilisation (in MVARh) of this service per balancing mechanism unit and per month.1Licence not specified10 months ago
- This dataset gives information on the arming and disarming of units contracted under CMIS (previously known as Constraint Management Pathfinder). The information is provided for each instance of arming. Time values are all given in local time in GB. >**NOTE:** Update 10th October 2024: Two changes have been made to the format of the Constraint Management Intertrip Arming 2024-2025 report. 1) From October 2024, all CMIS contracts are now priced on a £/MWh basis. This has been reflected in the ‘Current Arming Fee’ column header. Reports for 2023-24 and 2022-23 will continue to show the ‘Current Arming Fee’ as £/Settlement period which was the previous pricing model for Scotland (B6) 2) An additional column has been included to specify whether the armed BMU has a CMIS contract for Scotland (B6) or East Anglia (EC5)1Licence not specified10 months ago
- These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per hourly time period. >**NOTE:** Final interconnector capacity is calculated using these NESO values, values from the connected SO and the interconnector capability. Therefore, the interconnector’s final capacity value may be lower than the NESO values shown here. The final values can be found on each interconnector’s trading facilitator’s website. Values will only be published where a restriction has been applied by NESO. If there are no values, NESO has not applied a restriction.1Licence not specified10 months ago
- This publication is similar to "Historic Demand Data" dataset but updated on a daily basis with approximately ten days lag in receiving settlement data. In the dataset, embedded forecast for the upcoming next 7 days is also made available.1Licence not specified10 months ago
- This dataset contains the results from daily auction for static FFR and buy orders. For service requirement see this page: Static FFR Requirements1Licence not specified10 months ago
- The Balancing reserve service has been designed to secure firm positive and negative reserve on BM units at the day ahead stage. The service is procured via a daily auction at 08:15 for delivery between 23:00 and 23:00 D+1. For more details of the service and how to participate see this page: Balancing Reserve This data set contains the daily forecast of requirements for procurement via the Daily Balancing reserve auction. There are two separate datasets, a medium term forecast that gives an approximate requirement without detailed wind and solar forecasts, and the detailed daily forecast that refines the medium term figure with the latest short term features. The required volumes for both Positive Balancing Reserve and Negative Balancing reserve are given for each half-hour service window on each service day. The data sets are overwritten daily and the previous entries archived to the history file. >**NOTE:** All forecasts published on this page after 27th February are Live Demand Forecasts.1Licence not specified10 months ago
- Balancing Services Adjustment Data (BSAD) is used to submit balancing actions to the Balancing & Settlement Code (BSC), which defines the rules and governance for the balancing mechanism and imbalance settlement processes of electricity in Great Britain. BSAD covers actions taken outside of the balancing mechanism. >The BSAD methodology statement can be found here: [https://www.nationalgrideso.com/document/110891/download](https://www.nationalgrideso.com/document/110891/download)1Licence not specified10 months ago
- The NG ESO publishes non-BM instruction data from our ASDP system once instructions have been confirmed by Service Providers. This information is then continuously published throughout the day on this platform. A new monthly file is only created when a new set of instructions are dispatched for non-BM Fast Reserve (FR), Short Term Operating Reserve (STOR), and Regional Development Programme (RDP) MegaWatt (MW) Dispatch services.1Licence not specified10 months ago
- This dataset contains NRAPM (Negative Reserve Active Power Margin) forecast for Daily 2-14 days ahead and Weekly for 2-52 weeks ahead for both National and Scotland. The purpose of the NRAPM forecast is to indicate to the market a risk of NRAPM situation and therefore risk of Emergency Instructions. The insufficient NRAPM warning (Negative Reserve Active Power Margin) is a request to encourage more flexible parameters from generators, and inform participants of a risk of emergency instructions. A system NRAPM may be issued if there is insufficient flexibility available to ensure that generation matches demand during low demand periods.1Licence not specified10 months ago
- This dataset contains national electricity demand forecasts for 2-14 days ahead (medium term) as well as all historic 2-14 days ahead forecasts. These forecasts assist the industry to make efficient decisions in balancing their supply and demand positions. These files are updated twice daily, at 09:20 and 14:20.1Licence not specified10 months ago
- The carbon intensity of balancing actions measures the difference between the carbon intensity of the combined Final Physical Notice (FPN) of machines in the Balancing Mechanism (BM) and the equivalent profile with balancing actions applied.1Licence not specified10 months ago
- This publication displays the Electricity System Operator’s (ESO) wind generator availability in megawatt (MW) at a generator level at a weekly resolution for 2-52 weeks ahead.1Licence not specified10 months ago
- These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per hourly time period. >**NOTE:** Final interconnector capacity is calculated using these NESO values, values from the connected SO and the interconnector capability. Therefore, the interconnector’s final capacity value may be lower than the NESO values shown here. The final values can be found on each interconnector’s trading facilitator’s website. Values will only be published where a restriction has been applied by NESO. If there are no values, NESO has not applied a restriction.1Licence not specified10 months ago
- The historic half hourly day ahead national demand forecast as published via BMRS, alongside the outturn values, adjustments for TRIAD avoidance estimates and Absolute Percentage Error (APE) for each half hour from April 2021 onwards. TRIAD avoidance estimates may be revised after publication if required. For data further back in time, please see the data submitted to OFGEM for the 1B metric here: https://www.ofgem.gov.uk/publications/decisions-eso-guidance-documents-2021-231Licence not specified10 months ago
- A list of connected or contracted to connect embedded generation projects in Scotland.1Licence not specified10 months ago
- Balancing Services Adjustment Data (BSAD) is used to submit balancing actions to the Balancing & Settlement Code (BSC), which defines the rules and governance for the balancing mechanism and imbalance settlement processes of electricity in Great Britain. BSAD covers actions taken outside of the balancing mechanism. >The BSAD methodology statement can be found here: [https://www.nationalgrideso.com/document/110891/download](https://www.nationalgrideso.com/document/110891/download)1Licence not specified10 months ago
- These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per hourly time period. >**NOTE:** Final interconnector capacity is calculated using these NESO values, values from the connected SO and the interconnector capability. Therefore, the interconnector’s final capacity value may be lower than the NESO values shown here. The final values can be found on each interconnector’s trading facilitator’s website. Values will only be published where a restriction has been applied by NESO . If there are no values, NESO has not applied a restriction.1Licence not specified10 months ago
- This publication displays the Electricity System Operator’s (ESO) wind generator availability in megawatts (MW) at a daily resolution for 2-14 days ahead.1Licence not specified10 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for natural gas and residential heat demand which are included in this dataset.1Licence not specified10 months ago
- The dataset contains national and BMU-Level 0-14 day ahead wind forecasts for all the windfarms which are used to produce NESO's national day ahead incentive wind forecasts available [here](https://www.neso.energy/data-portal/day-ahead-wind-forecast). The forecasts are based on evaluated Operational Capacity, which is a deterministic value based on recent actual production levels of that BMU, captured from SCADA telemetry (Operational Metering).1Licence not specified10 months ago
- This dataset contains national electricity demand forecast for 7 days ahead as well as all historic 7 day ahead demand forecasts. The forecast assists the industry to make efficient decisions in balancing their supply and demand positions.1Licence not specified10 months ago
- The current suite of response services (DC, DM, and DR) are now being procured via the EAC platform. The daily auction results will now be published below. The previous results page will no longer be updated, but will be retained to share historical data. Auction results are available in the listed resources below.1Licence not specified10 months ago
- This dataset contains Non-BM Window Price change on ASDP sent by Service Provider and published on National Energy Data portal website.1Licence not specified10 months ago
- The BSUoS charge recovers the cost of day-to-day operation of the transmission system. Generators and suppliers are liable for these charges, which are calculated daily as a flat tariff for all users. Historical values of these charges, on a daily basis in a annual file, are provided here. There are a few missing dates and/or settlement periods from the years below under investigation.1Licence not specified10 months ago
- These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per hourly time period. >**NOTE:** Final interconnector capacity is calculated using these NESO values, values from the connected SO and the interconnector capability. Therefore, the interconnector’s final capacity value may be lower than the NESO values shown here. The final values can be found on each interconnector’s trading facilitator’s website. Values will only be published where a restriction has been applied by NESO. If there are no values, NESO has not applied a restriction.1Licence not specified10 months ago
- These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per hourly time period. >**NOTE:** Final interconnector capacity is calculated using these NESO values, values from the connected SO and the interconnector capability. Therefore, the interconnector’s final capacity value may be lower than the NESO values shown here. The final values can be found on each interconnector’s trading facilitator’s website. Values will only be published where a restriction has been applied by NESO . If there are no values, NESO has not applied a restriction.1Licence not specified10 months ago
- This dataset contains the volumes of all BOAs taken on wind BMUs that are used in our incentive wind forecasts.1Licence not specified10 months ago
- This dataset contains the historical and forecast profile dates used to convert our Cardinal Point forecasts into half hourly demand forecasts between the start of 2018 up to 14 Days Ahead. The profile dates are NESO's estimate at the historic date which will most closely match the forecast date in terms of weather, embedded generation, time of year, recurring calendar activities and special events. These dates can change as we get closer to real time as our weather forecasts are updated and certainty improves.1Licence not specified10 months ago
- As part of Clean Energy Package (CEP) 6.9, we will be running daily auction for procurement of STOR. The buy curve used in the daily assessment process is available here.1Licence not specified10 months ago
- OPMR is the amount of generation exceeding the demand forecast needed to meet our reserve requirement. When assessing and publishing generation availability information against system requirements, the ESO includes an OPMR above demand forecast for 2-52 weeks ahead.1Licence not specified10 months ago
- This dataset contains a preliminary list of Balancing Mechanism units that make up National Demand. This is related to the Historic Demand Data published here1Licence not specified10 months ago
- The dataset contains the latest update on important ancillary services procurement changes. Please subscribe to get the latest update.1Licence not specified10 months ago
- The publication consists of constraint breakdown information to provide additional transparency of why as ESO we are taking actions on the system. Please note that tags applied to actions can occasionally be changed post event and in this instance the information in this dataset would be refreshed to reflect the up to date information. The data is applicable to the transmission network only.1Licence not specified10 months ago
- Thermal constraints are taken when the amount of energy that would flow naturally from one region to another exceeds the capacity of the circuits connecting the two regions. This dataset provides outturn system costs for thermal constraints across a number of significant constraint boundaries.1Licence not specified10 months ago
- There are a number of factors which influence transmission losses. These include variations in zonal generation patterns, growth in northern vs southern generation, level of Scottish exports to England and Wales, changes in interconnector flows, level of partly loaded plant, reduced flows directly out of concentrations of generation (e.g. Drax, South Humber Bank, Killingholme), the degree of geographic dispersal of plant and also levels of demand growth. The configuration of the Transmission System, the geographic profile of operating voltages, and the characteristics of individual items of transmission equipment also influence losses. It is difficult for NESO to forecast future losses because many of the above factors are outside its control. Generally losses are very sensitive to the geographic generation pattern, and small changes in the north / south balance can have a significant impact on the overall transmission loss volumes from day to day and year to year. Post event, NESO monitors transmission losses incurred as a result of operating the transmission system. Normally network configuration and voltage profile are dictated by security, quality and safety considerations and the resulting configuration may or may not act to reduce losses. We always aim to operate the GB transmission system as efficiently and economically as possible in accordance with our licence conditions. Wherever possible we will despatch plant to minimise the overall cost of operating the system. Decisions taken to achieve this in the optimal manner overall may also indirectly result in lower transmission losses, but generally, the optimisation of transmission losses will not result in the system being operated in the most economic way, and would be likely to increase costs significantly. An example of this would be dispatching more expensive out of merit plant in the south to back off high north to south flows and reduce loadings on heavily loaded circuits which are contributing to higher transmission losses.1Licence not specified10 months ago
- Here you will find details of upcoming changes to the NESO Data Portal along with any known issues that we are working to resolve. If you have encountered any issues not captured in this table please report them to box.OpenData@nationalenergyso.com1Licence not specified10 months ago
- This dataset contains the 24-month ahead constraint costs on a monthly basis for the main boundaries on the transmission system. These costs are the costs of managing constraint boundaries (for thermal, voltage or stability constraints) plus the cost of meeting the voltage requirements. These costs do not include the cost of managing inertia or the largest loss of infeed.1Licence not specified10 months ago
- This dataset contains Mega Watt constraint limits for the main boundaries on the transmission system on weekly bases for 24 months ahead.1Licence not specified10 months ago
- This page holds the historic system frequency data for Great Britain at a 1 second resolution. It is the role of the National Grid ESO to keep the system frequency at 50 Hz, with a statutory limit of 0.5 Hz above or below this value. Time values are all given in Greenwich Mean Time (GMT) starting January 2020. >**NOTE:** Due to the size and format of these files, to view the data, please download the CSV file and open it with Notepad++ for complete document loading.1Licence not specified10 months ago
- This dataset will contain our forecasted requirements for Dynamic Moderation.1Licence not specified10 months ago
- This dataset will contain our forecasted requirements for Dynamic Regulation.1Licence not specified10 months ago
- This dataset contains approximate GIS (Geographic Information System) geospatial boundaries associated with each of the Grid Supply Points (GSPs) on the GB transmission network. GSPs are points of connection between the Transmission System and a Distribution System. This includes Offshore Transmission; a GSP exists for when an offshore wind farm connects to a Distribution System. The files include the GSP ID as registered with Elexon. This enables the end user to link the regions to the GSP Period Data available on Elexon’s Open Settlement Data webpage. The GSP boundaries are used for regional modelling of the GB electricity transmission network, for example to aggregate distributed embedded generator energy flows onto the transmission network. This includes the regional FES analysis and the Regional PV_Live outturn estimates published by The University of Sheffield. There are multiple versions of the GIS boundaries, with older versions maintained here for posterity. A changelog explains the major differences between recent versions. In early versions the boundaries have been derived by generating Thiessen polygons around the lowest level grid asset for which we have a topological lookup back to GSP. In some cases, this means Thiessen polygons have been generated around Distribution Network Operator (DNO) assets (e.g. Bulk Supply Points, Primary Substations etc) and these Thiessen polygons have been aggregated up to GSP level using topological lookups provided by the DNOs, in other cases no DNO asset GIS data was available in time for the dataset release and the GSP boundary is a single Thiessen polygon. Over the years we have improved the resolution of the boundaries as more data has become available. In places we have incorporated the GSP boundaries produced by the DNOs (who follow similar processes to generate these) now that the DNOs are producing and publishing these themselves. The GSP boundaries have been clipped to the DNO Licence Area boundaries, except where GIS data from DNOs provided evidence of a DNO serving demand in a neighbouring DNO Licence Area through an Inter-GSP-Group Connection point with the neighbouring DNO. Some GSPs have been grouped together because it was either not possible to discern which geographical regions they each serve or the area is geographic region is served by a GSP connecting to the onshore Transmission System and a GSP connecting to an offshore wind farm (Offshore Transmission). The 20181031 version of the dataset includes a lookup between GSPs and so-called Gnodes and Direct Connects. Gnodes are an entity used by teams within NESO for the purposes of modelling and monitoring the transmission network. In most cases there is a “ONE : ONE” relationship between “GSP : Gnode”, but occasionally a Gnode can represent several GSPs (“ONE Gnode : MANY GSPs”) and in some cases a Gnode represents an asset on the distribution network. In general, the relationship between GSPs and Gnodes is “MANY : MANY”. A Direct Connect represents demand connected directly to the transmission network. They are included in this dataset because they may theoretically host embedded generation and/or may form part of a MANY : MANY relationship with a Gnode.1Licence not specified10 months ago
- This dataset contains incremental updates for 2-52 weeks ahead demand forecast. The forecast assist the industry to make efficient decisions in balancing their supply and demand positions.1Licence not specified10 months ago
- This resource contains the population weighted percentage of Public schools on holiday across GB and for each Local Authority as well as the population multipliers given to each Local Authority. This dataset currently does not include private schools as they manage their holidays separately from the Local Authorities. The start date for each year is the first date for which any GB local authority is on its summer holiday for the first year and the end date is the final date for which any GB local authority is on its holiday before the summer holiday of the second year. Any gap between years is has no public school holidays during it. This data is used as an input into our demand models.1Licence not specified10 months ago
- Index Linked Contract can be used by National Grid ESO to meet the [voltage requirement](https://www.nationalgrideso.com/transmission-constraint-management?market-information "voltage"). The contract is normally enacted in the morning ahead of the power exchange auction. The generator will get paid based on the agreed strike price. The generator will also be compensated if the generation spread is negative, if positive, the positive spread will be deducted from the strike price. As the generation spread is calculated based on the outturn market indices, so the name of index linked contract.1Licence not specified10 months ago
- Quick Reserve, separated into Negative Quick Reserve (NQR) and Positive Quick Reserve (PQR), is aimed primarily for reacting to pre-fault disturbances to restore the energy imbalance quickly and return the frequency close to 50.0 Hz. The service is procured via a daily auction at 14:00 for delivery between 23:00 and 23:00 D+1. For more details of the service and how to participate see this page: Quick Reserve This data set contains the daily forecast of requirements for procurement via the Daily Quick Reserve auction. The data set is updated monthly.1Licence not specified10 months ago
- This dataset contains all the Balancing Services Use of System Charges (BSUoS) tariffs which are forecasted and set by the revenue team at National Grid ESO. These files will be updated on a six monthly basis (when tariffs are published), to receive automatic updates please register and subscribe to this dataset.1Licence not specified10 months ago
- This data set gives indicative values for the average daily price (in £ per GVAs) for BM accepted offers tagged as being for System Inertia. The tagging process identifies the most likely main reason for a Balancing Mechanism action, and is a best endeavours process, as individual actions can be taken for a combination reasons. The data is published at daily resolution, and is calculated by summing the total cost of all offers tagged in each day as System Inertia actions and dividing by the sum of estimates of the inertia provided. Worked examples are provided below. 1. ESO sum up the total cost of actions instructed in the BM which are tagged as system inertia for a given day. 2. ESO sum up the total volume of inertia shortfall (GVA.s) in each settlement period of the day. 3. ESO divide the total cost of inertia actions per day by the total volume of inertia shortfall (GVA.s) to give the average daily cost per GVA.s. Example 1: - Settlement Periods 4-7 (inclusive) = 1 GVA.s shortfall in each period replaced at total cost of £5,000. - Settlement Periods 8-11 (inclusive) = 4 GVA.s shortfall in each period replaced at total cost of £40,000. Total cost for the day = £5,000 + £40,000 = £45,000 Total inertia volume instructed for the day (on SP basis) = (1 x 4 SPs) + (4 x 4 SPs) = 20 GVAs Average daily inertia cost = (45,000 / 20) = £2,250/GVA.s Example 2: - SP 4-8 = 1 GVA.s shortfall in each period replaced at total cost of £5,000. - SP 8-16 = 4 GVA.s shortfall in each period replaced at total cost of £80,000. Total cost for the day = £5,000 + £80,000 = £85,000 Total inertia volume instructed for the day (on SP basis) = (1 x 4) + (4 x8) = 36 GVAs Average daily inertia cost = (85,000 / 36) = £2,361/GVA.s These examples represent the average daily inertia cost (£/GVA.s) using the actions we take on a SP basis where system inertia is below our minimum operating level.1Licence not specified10 months ago
- This dataset will contain our forecasted requirements for Static Firm Frequency Response.1Licence not specified10 months ago
- Please visit Demand Flexibility Service for the latest auction results. This dataset will no longer be updated. NESO are again launching the Demand Flexibility Service (DFS) for Winter 2023/24. The service allows the NESO to access additional flexibility when the national demand is at its highest – during peak winter days – which is not currently accessible to the NESO in real time. The service will allow consumers – both domestic and I&C – to be incentivised for voluntarily flexing the time during which they use their electricity. This dataset contains updates and information relating to both **live** and **test** DFS events. NESO have launched the Demand Flexibility Service (DFS) for winter 2023/24. The service allows the NESO to access additional flexibility when the national demand is at its highest – during peak winter days – which is not currently accessible to the NESO in real time. The service will allow consumers – both domestic and I&C – to be incentivised for voluntarily flexing the time during which they use their electricity. Text message/SMS alerts are available for this dataset. This dataset will contain the following files: - **DFS Utilisation Report**: this file will provide details of accepted and rejected bids for both **live** and **test** events, and includes a breakdown by GSP. The NESO will endeavour to update this file within one hour of bid submission gate closure – which occurs one hour after the DFS service requirements are issued. Note: this file will only be updated on days with a corresponding DFS service requirement. - **DFS Utilisation Report Summary**: this file will provide a summary of the demand flexibility volumes procured and delivered for both **live** and **test** events. The file will be updated after the DFS utilisation report has been updated, and/or when the relevant settlements data has been processed. - **DFS Industry Notifications**: this file will indicate when the NESO anticipates publishing a DFS service requirement for a **live** or **test** event, and will provide additional information pertaining to issuing a DFS service requirement. - **DFS Service Requirement**: this file will contain details of service requirements for both **live** and **test** events.”1Licence not specified12 months ago
- This dataset contains a breakdown of all the Transmission Network Use of System (TNUoS) tariff elements of which are forecasted and set by the revenue team at National Grid ESO. These files will be updated on a quarterly basis (when tariffs are published), to receive automatic updates please register and subscribe to this dataset.1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for emissions from whole system and gas supply which are included in this dataset.1Licence not specified12 months ago
- The “Contract Transfer of Obligation” will be updated when ESO receives a Market Provider request to transfer a Balancing Service contract from a contracted unit to a non-contracted unit. This file will be updated to reflect these changes only when a transfer request has been received.1Licence not specified12 months ago
- A set of auction results views which present the outcome of daily Enduring Auction Capability (EAC) - Balancing Reserve (BR) mock auction runs. The EAC-BR Mock Auction Results are updated daily in the morning and are available in the listed resources below. >**NOTE:** EAC-BR Mock Auction Results are scheduled to be published on this page from 14th-23rd February 2024 only.1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the European electricity supply values which are included in this dataset.1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for natural gas and residential heat demand for which this file contains the definitions.1Licence not specified12 months ago
- Please visit EAC auction results for the latest auction results. This dataset will no longer be updated.1Licence not specified12 months ago
- Data for 2024 will be made available on the 15th of July, 2024. Long term electricity forecasts per region covering demand, demand side response and distributed generation based on our Future Energy Scenarios. Regions presented are Grid Supply Points (GSPs) and large sites connected directly to the transmission system. An example visualisation of this data can be seen here: https://www.futureenergyscenarios.com/1Licence not specified12 months ago
- Mock auction results will be available only for a temporary period. These are a set of auction results views which present the outcome of the weekly mock EAC auction runs. Results are updated once weekly and divided into the four datasets shown. Live EAC results will be available on a new page called “EAC auction results. Updates from live EAC will be daily on successful conclusion of each daily auction run. Namely: Results by Unit, Buy Orders, Sell Orders and Results Summary. Mock Auction Results scheduled to upload on the below dates: 27 September 2023 by 15:00 BST 4 October 2023 by 15:00 BST 11 October 2023 by 15:00 BST1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for whole system and gas supply which are included in this dataset.1Licence not specified12 months ago
- Super Stable Export Limit (SEL) is utilised to directly decrease the sum of the minimum MW level or SEL of generators synchronized to the system by lowering the minimum generating level at a generator synchronised. The service is open to Balancing Mechanism participants who can meet the minimum technical requirement. Super SEL service does not require a change in the energy output of the generation, it is to give access to a reduced minimum active power level. Super SEL contract enactment will be through a trading instruction. Dispatch will be via the Balancing Mechanism to reduce output to the new lower SEL if required. Live data is refreshed every 10 minutes, and if there are no changes to the data, then there will be no updates.1Licence not specified12 months ago
- This dataset is a FES output of data tables containing the GB FES values for road transport. The FES represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target.1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for electricity Supply which are included in this dataset.1Licence not specified12 months ago
- This dataset contains a breakdown of all the Assistance for Areas of High Electricity Distribution Costs (AAHEDC) Tariffs elements which are forecasted and set by the revenue team at National Grid ESO. These files will be updated on a bi annual (when tariffs are published), to receive automatic updates please register and subscribe to this dataset.1Licence not specified12 months ago
- **Winter 2022/23 Data** The Demand Flexibility Service (DFS) has been developed to allow the NESO to access additional flexibility when the national demand is at its highest – during peak winter days – which is not currently accessible to the NESO in real time. This new innovative service will allow consumers, as well as some industrial and commercial users (through suppliers/aggregators), to be incentivised for voluntarily flexing the time when they use their electricity. This dataset will contain updates regarding the use of the live service (not test events), to view data on test events please visit the following dataset: https://www.nationalgrideso.com/data-portal/demand-flexibility-service-test-events Text message/SMS alerts are available for this dataset, to register for this service please follow the guidance provided here: https://www.nationalgrideso.com/data-portal/data-portal-faqs#sms This dataset will contain the following files: - Utilisation Report Summary - LIVE: This file will provide a summary of the utilisation report, it will be updated at around 16:30 GMT (only on days where there was a published requirement). - DFS Utilisation Report - LIVE: This file will provide details of accepted and rejected bids for DFS and includes a breakdown by GSP, it will be updated at around 16:30 GMT (only on days where there was a published requirement) and at around 10:00 GMT on the day the service is required - Service Update Industry Notifications - LIVE: This file will provide notice of live service updates related to the publication of requirements - DFS Service Requirement - LIVE: This file will contain details of live service requirements.1Licence not specified12 months ago
- We have been working with the other network companies as part of the Energy Networks Association (ENA) Open Networks project. The Whole System Electricity FES: Pathways to Net Zero part of this work seeks to develop processes to coordinate National and Regional pathways whilst providing improved clarity and transparency to stakeholders around the various scenarios being produced by ourselves and the network companies. This work is intended to align the GB FES and Regional Distribution Future Energy Scenarios (DFES's) forecasts further and to ensure the data presented gives an accurate reflection of the whole industries’ best view of the future scenarios. One of the outputs is an agreed set of common building blocks, of which the GB FES values are included here. Common building blocks ensure that the results of the GB FES and Regional DFESs are published to a consistent template making comparison easier as we can now directly compare like for like components. We hope you find this additional information useful. Should you have any comments please don’t hesitate to contact us. For suggestions related the data provision itself, you may also contact us and/or the ENA Open Networks project via opennetworks@energynetworks.org1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for the electricity system flexibility which are included in this dataset.1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for electricity demand which are included in this dataset.1Licence not specified12 months ago
- The FES: Pathways to Net Zero represent a range of different, credible ways to decarbonise our energy system as we strive towards the 2050 target. One of the FES outputs is an agreed set of data tables containing the GB FES values for road transport which are included in this dataset.1Licence not specified12 months ago
- In our role as Electricity System Operator (ESO), we balance generation and demand in real time. When demand is low, there may be a requirement for additional flexibility to balance generation and demand, as well as to achieve sufficient negative reserve and high frequency response. During 2020-22, there was a risk that restrictions associated with COVID-19 could present lower demand periods for longer durations than we had seen in the past. To help manage these changing system conditions we implemented an Optional Downward Flexibility Management (ODFM) Service across the summer periods in 2020 and 2021. The service is no longer live. Optional Downward Flexibility Management (ODFM) is a service which allows the ESO to access downward flexibility that is not currently accessible in real time and expand our ability to control output from providers we cannot currently access through the Balancing Mechanism and the Platform for Ancillary Services.1Licence not specified12 months ago
- **Winter 2022/23 Data** The Demand Flexibility Service (DFS) has been developed to allow the NESO to access additional flexibility when the national demand is at its highest – during peak winter days – which is not currently accessible to the NESO in real time. This new innovative service will allow consumers, as well as some industrial and commercial users (through suppliers/aggregators), to be incentivised for voluntarily flexing the time when they use their electricity. This dataset will contain updates regarding the use of the test service (not live events), to view data on live events please visit the following dataset: https://www.nationalgrideso.com/data-portal/demand-flexibility-service-live-events This dataset will contain the following files: - Utilisation Report Summary- TEST: This file will provide a summary of the utilisation report, it will be updated at around 16:30 GMT (only on days where there was a published requirement). - DFS Utilisation Report- TEST: This file will provide details of accepted and rejected bids for DFS and includes a breakdown by GSP, it will be updated at around 16:30 GMT (only on days where there was a published requirement) and at around 10:00 GMT on the day the service is required - Service Update Industry Notifications - TEST: This file will provide notice of test service updates related to the publication of requirements - DFS Service Requirement - TEST: This file will contain details of test service requirements.1Licence not specified12 months ago
- National Grid ESO procures [balancing service contracts](https://www.nationalgrideso.com/industry-information/balancing-services) to balance demand and supply and to ensure the security and quality of electricity supply across Britain's transmission system. For some of the balancing services contracts which fall within trading timescales, (i.e. several days ahead to a couple of hours ahead) the trading team will evaluate all the possible balancing actions including trading and balancing services, and take the most cost-effective actions. If the balancing services contract provides the best solution, the contract will be enacted. The balancing service contracts come in different shapes and forms. We are grouping some of the contract enactment here which typically has relative similar structure or price are fixed at the time of the decision. For example, it can be for constraint management in Scotland, or deliver reactive power requirement. Usually, the balancing service contract enactment doesn't have the physical exchange of power or energy, the balancing services contracts that are not enacted by trading team are not included here. Live data file is refreshed every ten minutes.1Licence not specified12 months ago
- This dataset contains approximate GIS (geographic information system) geospatial boundaries for each of the DNO Licence Areas in Great Britain. There are 14 licensed Distribution Network Operators (DNOs) in Britain and each is responsible for a regional distribution services area. DNO Licence Areas are sometimes referred to as GSP Groups and historically have also been known as Public Electricity Supplier (PES) regions, though the latter name is no longer widely used. The DNO Licence Area boundaries are unusual because they are only well defined when tested. The boundaries tend to run through rural areas and change over time whenever a new connection is added close to a boundary. For example, a new connection close to an existing boundary can approach the DNO responsible for both neighbouring Licence Areas to ask for a connection, and is free to choose either depending on how much they will charge - once the new connection is made the boundary is, theoretically, re-drawn to ensure that the new connection falls into the correct Licence Area. The boundaries in this dataset were originally shared by Western Power Distribution, now National Grid Electricity Distribution (the DNO responsible for 4 of the 14 Licence Areas) and come with the disclaimer that they are probably a little outdated and not 100% accurate. That said, they are a good indication of the geography of DNO Licence Areas. DNO Licence Areas are widely used as an aggregation entity when reporting electricity network data, for example, in Elexon's publication of electricity settlement data. As such, they are also useful for regional modelling of the GB electricity transmission network, for example to aggregate distributed embedded generator energy flows onto the transmission network. A good example of this is the Regional PV_Live outturn estimates published by The University of Sheffield (https://www.solar.sheffield.ac.uk/pvlive/regional/).1Licence not specified12 months ago
- The MBSS gives the costs and volumes of balancing services used by the ESO. These costs are broken into individual months in the past financial year, as well as by each individual service. The most recent month is based on preliminary figures, which are subject to change once updated information becomes available. These changes will be evident in the datasets of future months. Alongside the data files are the PDF reports of the data, giving some extra insight and analysis. >**Note:** we have withdrawn the monthly Balancing Services summary 2022/23 report for March 2023, due to some data errors. It will be available on the portal once the issue is resolved. Apologies for any inconvenience.1Licence not specifiedover 1 year ago
- This dataset represents the regional results from the Spatial Heat model used as part of the Future Energy Scenarios. The 2021 data was generated to support a thought piece to explore the findings from our new spatial heat model in more depth. The data varies from the data published alongside our FES 2021 analysis due to our analysis and modelling being updated. This includes an enhanced representation of how technology stock varies on a regional basis. This was in readiness for our FES 2022 analysis. The data includes the number of buildings per Local Authority on each heating technology, for each scenario between 2020 and 2035, in five year increments as well as the proportion of buildings in each LA on each technology. The 2022 data is an output from our FES 2022 analysis and includes data for each scenario between 2020 and 2050.1Licence not specifiedover 1 year ago
- Frequency Response Products Market Information Report aims to give guidance on the response products requirement and updates on recent changes to procurement of those products.1Licence not specifiedover 1 year ago
- This dataset contains approximate GIS (geographic information system) geospatial boundaries for each of the TNUoS generation zones in Great Britain. There are 27 TNUoS generation zones, and each is associated with a set of generation zonal tariffs. The total number of TNUoS generation zones may change over time. In addition, the boundaries tend to flex over time when a new substation is added close to a boundary. Once we identify an existing substation that is the closest neighbour to the new substation (the “distance” is measured by site-specific incremental MWkm), the boundary is, theoretically, re-drawn to ensure that the new substation falls into the same generation zone that contains its nearest neighbouring substation. The boundaries are indicative and come with the disclaimer that they are not 100% accurate. That said, they are a good indication of the geography of TNUoS generation zones. In the event of any inconsistencies between the shapefiles and the CUSC, the TNUoS tariff reports or the NGESO Use of System Charging Statements, then the CUSC, the TNUoS tariff reports or the NGESO Use of System Charging Statements will take precedence. For the TNUoS demand zones shapefiles, please refer to https://api.nationalgrideso.com/dataset/gis-boundaries-for-gb-dno-license-areas1Licence not specifiedover 1 year ago
- This dataset contains a year ahead Mega Watt constraint limits for the main boundaries on the transmission system. >**NOTE:** This dataset has now been replaced by the "24 Months Ahead Constraint Limits" dataset ("https://www.nationalgrideso.com/data-portal/24-months-ahead-constraint-limits"). For updated data please visit the new dataset.1Licence not specifiedover 1 year ago
- As part of our work on developing our balancing services we ran a weekly trial auction for Firm Frequency Response. The weekly auction trial results and order hash data are available here. Note: The 2 year trial of the procurement platform ended with the last LFS and DLH auctions being run on the 26th November 2021. After this date we have ceased procuring LFS and DLH services.1Licence not specifiedover 1 year ago
- This dataset provides indicative values for the average daily price (in £ per GVAs) for BM accepted offers tagged as being for System Inertia. It also includes the cost of bid actions required to offer on inertia. There are three variations of costs included in this dataset. Method A: The cost of the inertia based on the average bid price, Method B: The cost of inertia assuming the units replace energy taken off at the average wind bid price, Method C: The cost of inertia assuming the units replace energy taken off at the highest bid price. These prices represent all bid prices in each category and not necessarily the accepted bid price.1Licence not specifiedover 1 year ago
- The Firm Frequency Response (FFR) post tender reports are published following each monthly tender. They indicate which tenders were accepted and rejected and the information submitted for these tenders. Reason codes, which explain why a given tender was rejected, can be found below the table in the data files, or in the FFR market information reports.1Licence not specifiedover 1 year ago
- The Electricity Ten Year Statement outlines the ESO’s view of the National Electricity Transmission System over the next ten to twenty years.1Licence not specifiedover 1 year ago
- The BSUoS charge recovers the cost of day-to-day operation of the transmission system. Generators and suppliers are liable for these charges, which are calculated daily as a flat tariff for all users. Historical values of these charges, on a daily basis, are provided here.1Licence not specifiedover 2 years ago
- This page contains live system data for transmission demand, frequency and transfers. This dataset does not currently include any files to download, all information is presented on this page. Use the links below to navigate to the area of interest. >**NOTE:** The "Live System Information" dataset will be removed from the Data Portal on 1 September,2023. Users are kindly requested to access https://extranet.nationalgrid.com/RealTime for Live System Data from 1 September,2023. [System Overview](#SysOv) [Frequency Last 60 Mins](#Fl60m) [Transmission Demand Last 60 Mins](#Dl60m) [Transmission Demand Last 24 Hrs](#D24h) [Transmission Demand Last 7 Days](#D7Days) System Overview Refresh Graph Back to Top Frequency Last 60 Mins Refresh Graph Back to Top Transmission Demand Last 60 Mins Refresh Graph Back to Top Transmission Demand Last 24 Hrs Refresh Graph Back to Top Transmission Demand Last 7 Days Refresh Graph Back to Top1Licence not specifiedover 2 years ago
- This file contains the Electricity System Operator's (ESO) half-hourly BSUoS forecast (Balancing Services Use of System charge). The estimated BSUoS charge is calculated by taking the forecast half-hourly balancing costs divided by the forecast BSUoS volume. **Disclaimer:** This forecast is published without prejudice and whilst every effort has been made to ensure the accuracy it is subject to several estimations and forecasts and may not bear relation to either the indicative or actual tariffs Electricity system Operator will publish at a later date. >**NOTE:** After an industry modification, CMP361 has came into force from the 1st April 2023, this will mean that this dataset will not be updated from April 2023 onward.1Licence not specifiedover 2 years ago
- The Balancing Services Use of System (BSUoS) costs are reported on a monthly basis with a forecast for the next month and a rolling 24 month period. Here you can find the report created each month which includes the outturn from the previous month, the forecast for the next 24 months and a view on accuracy of previous forecasts. **Disclaimer**: This forecast is published without prejudice and whilst every effort has been made to ensure the accuracy based on the assumptions and models used, it is subject to several estimations and forecasts and may not bear relation to either the indicative or actual tariffs Electricity system Operator will publish at a later date. Note: The February outturn was published with the incorrect volume which affects the outturn BSUoS charge. Please see the revised outturn below incorporating these updates. No figures have been changed except for the volume for Feb 22 and therefore the BSUoS charge for Feb 22.1Licence not specifiedover 2 years ago
- The data set shows the daily costs outturn per category associated with balancing the system for the year to date, and the daily forecast costs for the following financial year. In the dataset the category costs are presented broken down per services procured through the Balancing Mechanism, Trading, Ancillary Services and SO-to-SO transactions. 1Licence not specifiedover 2 years ago
- The Balancing Services Charging Report (BCR) provides a breakdown of the Balancing Services Use of System (BSUoS) charge. There is a BCR for each run type we calculate a BSUoS charge for - Interim Initial (II), Settlement Final (SF) and Reconciliation Final (RF). It is published each day that we invoice our BSUoS customers. The file is a zip file containing the report in PDF, PRT, DAT and CSV format. These files correspond to the BCRNEW files being published on the website. https://www.nationalgrideso.com/industry-information/charging/balancing-services-use-system-bsuos-charges.1Licence not specifiedalmost 3 years ago
- Documentation relating to interconnector trading, including the procurement framework and supporting materials. Watch the video below: >**NOTE:** Interconnector Requirement and Auction Summary Data1Licence not specifiedalmost 3 years ago
- >**NOTE:** The ESO operational transparency forum has a new website page, please visit the ESO website for up to date information. All historic data has been transitioned over to the new platform and in turn this data set will be discontinued. https://www.nationalgrideso.com/who-we-are/electricity-national-control-centre/operational-transparency-forum1Licence not specifiedalmost 3 years ago
- In April 2018, the ESO initiated strategic transformation project to develop and implement state of art forecasting capability to deliver value to consumers by providing accurate possible, user-friendly comprehensive forecasts to our stakeholders to make informed decisions ahead of real-time Our strategic forecasting project aims to replace our existing energy forecasting system (EFS) with an advanced cloud-based platform for energy forecasting (PEF) while designing & improving forecasting models, methodologies and apply advanced statistical learning & machine learning modelling techniques & automation. On this page, you will find updates to the roadmap for the project.1Licence not specifiedalmost 3 years ago
- Fast Reserve provides the rapid and reliable delivery of active power through an increased output from generation or a reduction in consumption from demand sources, following receipt of an electronic dispatch instruction from National Grid Electricity System Operator (ESO). These tender reports provide information on the post-assessment results of tenders. > **Note:** This datafeed **is no longer being updated** as we are not currently procuring Fast Reserve. More information about the future of Fast Reserve tenders can be found here: [https://www.nationalgrideso.com/balancing-services/reserve-services/fast-reserve](https://www.nationalgrideso.com/balancing-services/reserve-services/fast-reserve)1Licence not specifiedalmost 3 years ago
- If demand ends up being greater than forecast, or there is unforeseen generation unavailability, extra sources of power may be needed to manage the system. One form of reserve that is used to manage this is Short Term Operating Reserve (STOR), which runs from 20 mins - 4 hours after a frequency event occurs. These tender results show the outcome of the associated tender round for every STOR year available in that tender round. > ** Please Note:** This datafeed is **no longer being updated** as we are now procuring STOR via daily auctions. More information about STOR daily auctions can be found here: [https://www.nationalgrideso.com/balancing-services/reserve-services/short-term-operating-reserve-stor](https://www.nationalgrideso.com/balancing-services/reserve-services/short-term-operating-reserve-stor)1Licence not specifiedalmost 3 years ago
- In our role as Electricity System Operator (ESO), we balance generation and demand in real time. When demand is low, there may be a requirement for additional flexibility to balance generation and demand, as well as to achieve sufficient negative reserve and high frequency response. Restrictions associated with COVID-19 are likely to present lower demand periods for longer durations this summer than we have seen in the past. To help manage these changing system conditions we have implemented an Optional Downward Flexibility Management (ODFM) Service across the summer period. Optional Downward Flexibility Management (ODFM) is a service which allows the ESO to access downward flexibility that is not currently accessible in real time and expand our ability to control output from providers we cannot currently access through the Balancing Mechanism and the Platform for Ancillary Services. The documents in this dataset outline the contractual terms and associated templates. We shall also publish occasional market information here relating to requirements and market reports. > **Note: You can find market information reports and results for the ODFM service [here](https://data.nationalgrideso.com/ancillary-services/optional-downward-flexibility-management-odfm-market-information)**1Licence not specifiedalmost 3 years ago
- Fast Reserve provides the rapid and reliable delivery of active power through an increased output from generation or a reduction in consumption from demand sources, following receipt of an electronic dispatch instruction from National Grid Electricity System Operator (ESO). These reports provide information about the volume of, and time periods over which, Fast Reserve has been required. **Note** - Since the introduction of Fast Reserve dispatch instructions to our [NBM ASDP report](https://data.nationalgrideso.com/ancillary-services/non-bm-ancillary-service-dispatch-platform-asdp-instructions) on our data portal in 2020, we have continued to provide the Fast Reserve Market Information report (MIR). As the NBM ASDP report is available in CSV format and contains all of the data that we use to create the monthly Fast Reserve MIR, we believe that market providers can now use the machine readable format to undertake their own analysis of the Fast Reserve service and create bespoke reporting. In addition, as Fast Reserve is only being procured through the Optional service, there is no tender results data to share as part of market information. Therefore, we intend to stop producing the MIR for future months, and just retain all the historical MIR on our data portal, with the June 2021 report being the last one published.1Licence not specifiedalmost 3 years ago
- The National Grid Electricity System Operator (ESO) publishes an annual report on the performance of the National Electricity Transmission System (NETS) in Great Britain and fulfils Transmission Licence Standard Condition C17: Transmission System Security Standard and Quality of Service. This dataset provides details of any voltage or frequency excursions in the NETS. It is updated following any voltage or frequency excursions.1Licence not specifiedalmost 3 years ago
- If demand ends up being greater than forecast, or there is unforeseen generation unavailability, extra sources of power may be needed to manage the system. One form of reserve that is used to manage this is Short Term Operating Reserve (STOR), which runs from 20 mins - 4 hours after a frequency event occurs. These market information reports are produced after each tender round and are designed to give existing and potential STOR participants an overall view of the tenders received. They give data on the tendered utilisation and availability prices, our forward contracted position and further details on the type and dynamics of the tendered units. **Please Note:** This datafeed **is no longer being updated** as we are not currently procuring STOR. More information about the future of STOR tenders can be found here: [https://www.nationalgrideso.com/balancing-services/reserve-services/short-term-operating-reserve-stor](https://www.nationalgrideso.com/balancing-services/reserve-services/short-term-operating-reserve-stor)1Licence not specifiedalmost 3 years ago
- Please visit our ENCC Transparency Roadmap which highlights the activities we will deliver in the short to medium term. We welcome any further suggestions or questions regarding future data items or portal functionality, please get in touch with us at box.OpenData.ESO@nationalgrideso.com1Licence not specifiedover 3 years ago
- Data showing the demand suppression attributed to the Coronavirus Pandemic. Demand suppression is calculated by taking the National Demand + Embedded Generation outturns and comparing this with the modelled demand assuming no Coronavirus pandemic given the same model parameters (day of week, temperature, etc.). This is split into various periods of the day (timings are half-hour ending): + Night: 00:30 to 07:00 (Trough) + Morning: 07:30 to 13:00 (Peak) + Afternoon: 13:30 to 16:30 (Trough) + Peak: 17:00 to 20:30 (Peak) + Evening: 21:00 to 00:00 (Peak) It also shows the overall suppression (Whole Day). Demand drops over bank holidays are capturing both the pandemic effect as well as the effect of the bank holidays themselves which under normal conditions cause drops in demand also. We do not have sufficient data to separate these effects. This methodology works at a national level with a linear model using least squares regression and cannot be adapted for use in our regional time-based demand models. In agreement with Ofgem & BEIS we are ceasing the publication and reporting of the demand suppression assessment with effect of 19 May 2021. Data on demand suppression was being calculated using a comparison with pre-COVID demand levels, and we can no longer be sure that any changes are attributable to COVID alone. We hope that you found the ESO's assessment of the demand suppression insightful and useful.1Licence not specifiedover 4 years ago
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