Power plants in Washington emitted 266.6 lb CO2e per MWh generated in 2023 (0.1209 kg/kWh), 65% cleaner than the US average, according to EPA's eGRID2023 state rate. Their generation was 77% carbon-free and 69% renewable. For GHG Protocol Scope 2 location-based reporting, use the eGRID subregion factor of each facility's ZIP (below), not the state rate: power flows across state lines within a subregion.
All of Washington's ZIP codes are in the NWPP (WECC Northwest) eGRID subregion, whose Scope 2 factor is 635.267 lb CO2e/MWh (0.2882 kg/kWh).
Generation by power plants in Washington, 2023 (EPA eGRID2023 state resource mix).
Using the NWPP subregion factor (635.267 lb CO2e/MWh = 0.2882 kg/kWh). Source: EPA eGRID2023.
For GHG Protocol Scope 2 location-based emissions reporting, multiply each facility's electricity consumption by the emission factor for its ZIP code's eGRID subregion. All Washington ZIP codes use the NWPP factor: 635.267 lb CO2e/MWh.
curl "https://emission-factors.com/api/lookup?zip=YOUR_ZIP"
For Scope 2 reporting, it depends on the ZIP: all are in NWPP, 635.267 lb CO2e/MWh. EPA's state rate for plants in Washington is 266.6 lb CO2e/MWh, 65% cleaner than the US average.
Multiply the facility's annual kWh by the kg/kWh factor of its ZIP code's eGRID subregion (0.2882 for NWPP) to get kg CO2e, and divide by 1,000 for metric tonnes. The emission factors API returns the factor for any ZIP.
Power plants in Washington generated 77% carbon-free and 69% renewable electricity in 2023. At 267 lb CO2e/MWh, the state rate is 65% cleaner than the US average of 770.9 lb/MWh.
Get exact emission factors by ZIP code
33,700+ ZIP codes · All 27 eGRID subregions · CO2e, NOx, SO2, generation mix
Read the API docs · Scope 2 calculation guide