Emissions associated with electricity production are emissions from operation of power plants. These emissions are represented at the location of the power plant, regardless of where the power is consumed. Electricity production data come from three sources: 1) EPA’s Clean Air Markets Division (CAMD) data generated from hourly measurements of CO₂ emissions from continuous emission monitoring systems (CEMS) stack monitoring, 2) EIA data on power plant fuel consumption reported at the monthly scale, and 3) U.S. EPA NEI which captures some small co-generation facilities not included in the other data sources.

Data Sources #

• EIA Form 923 Data
• EIA Form 860 Data
• EPA’s Clean Air Markets (CAM) Data
• EIA and CAM Facility ID Crosswalk

Methods summary #

For Electric generating unit (EGU) EIA 923 and EIA 860 datasets are merged to assign coordinates to facilities, with missing values gapfilled. CAM emissions are tagged with DOE fuel codes and mapped to A4 fuel IDs, with CO₂ emissions estimated based on heat output using tCO₂/mmBTU factors. The data is aggregated by facility, fuel, and year, then merged using an ID crosswalk, with EIA data prioritized over CAM for completeness. Duplicate entries and complex ID matches are manually resolved to ensure accurate facility mapping. For Electricity Production Stationary Point Envirofacts and GHGRP Subparts data are aggregated by facility_id, fuel_id, and year. Where data overlaps, GHGRP Annual data is prioritized over Envirofacts and GHGRP Subparts. Facilities are tagged with Envirofacts fuel information where available