Washington's electricity grid has a CO2e emission factor of 635.3 lb/MWh (0.2882 kg/kWh) - 18% cleaner than the US average. The grid is 58% carbon-free and 55% renewable. These are the official EPA eGRID2023 values used for GHG Protocol Scope 2 location-based emissions reporting.
Washington is entirely within the NWPP (WECC Northwest) eGRID subregion.
Latest monthly state-level average rate (EIA Form 861, 2026-04):
| Sector | $/kWh |
|---|---|
| Residential | $0.1436 |
| Commercial | $0.1174 |
| Industrial | $0.0701 |
| All sectors | $0.1192 |
State-level averages, not utility-specific tariffs. For exact pricing, check your utility's published rate schedule.
Average hourly CO2e intensity across the last 7 days from Bonneville Power Administration (WA's balancing authority). Red = dirtiest, green = cleanest. Data: EIA-930 (~24h lag).
Hours in local standard time. Swing: 1.21× between cleanest (00:00 local) and dirtiest (21:00 local).
Read full guide on hourly grid carbon intensity →
Using Washington average: 635.3 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 facilities use the NWPP factor: 635.267 lb CO2e/MWh.
curl "https://emission-factors.com/api/lookup?zip=YOUR_ZIP"
Washington's EPA eGRID2023 electricity emission factor is 635.3 lb CO2e per MWh (0.2882 kg per kWh). This is 18% cleaner than the US national average.
Multiply the facility's annual kWh consumption by 0.2882 to get kg CO2e. Divide by 1,000 for metric tonnes. For facilities spanning multiple Washington subregions, use the emission factors API to get the exact factor by ZIP code.
Washington's grid is 58% carbon-free and 55% renewable. At 635 lb CO2e/MWh, it is 18% cleaner than the US average of 770.9 lb/MWh.
Get exact emission factors by ZIP code
33,616 ZIP codes · All 27 eGRID subregions · CO2e, NOx, SO2, generation mix
Read the API docs · Scope 2 calculation guide