Monthly totals of gross inland deliveries of the five major oil products to Ireland. Gross inland delivery is the quantity of each product flowing through the market from production to delivery that is ready for sale or consumption. Monthly gross inland deliveries of oil products are determined by SEAI based on the aggregation of confidential submissions made by oil suppliers to Ireland’s Oil Levy Administration (OLA) database, which is administered and maintained by the Department of the Environment, Climate and Communications (DECC). SEAI determines and submits monthly gross inland deliveries of oil products to satisfy Ireland’s international reporting obligations under the 2008 European Energy Statistics Regulation. Oil delivery data is sourced from the OLA database in units of volume (i.e. litres) and mass (i.e. tonnes) depending on the oil product, with SEAI making the conversion to TJ to comply with international reporting obligations. Monthly oil delivery data is published in terms of net calorific value (NCV).