This API provides data on U.S. consumption for useful thermal output in British thermal units (Btu). Data organized by fuel type, i.e., coal, petroleum liquids, petroleum coke, and natural gas. Data also organized by sector, i.e., electric power, electric utility, commercial and industrial. Annual, quarterly, and monthly data available. Based on Form EIA-906, Form EIA-920, and Form EIA-923 data.