NWPP eGRID Subregion - WECC Northwest Emission Factor (2023)

EPA eGRID2023 Rev2 · States: WA, OR, MT, UT, ID, NV, WY, CA, AZ, NM · Average

NWPP (WECC Northwest) covers ZIP codes in WA (28%), OR (19%), MT (15%), UT (14%), ID (13%), NV (5%), WY (3%), CA (2%), AZ (1%), NM (1%), by share of its ZIP codes. Its largest generation sources in 2023 were hydro 39%, gas 25%, coal 16%. This page gives the official EPA eGRID2023 emission factors for NWPP, used for GHG Protocol Scope 2 location-based reporting.

Emission Factors

635.267

lb CO₂e / MWh

0.2882

kg CO₂e / kWh

58.25%

Carbon-free

55.12%

Renewable

The NWPP subregion is 18% cleaner than the US average (770.9 lb CO₂e/MWh).

All Pollutants

Pollutant	lb / MWh	kg / kWh	Scope
CO₂e (total GHG)	635.267	0.2882	Scope 2
CO₂	631.735	0.2866	Scope 2
CH₄ (methane)	0.054	0.00002449	Scope 2
N₂O (nitrous oxide)	0.008	0.00000363	Scope 2
NO_x	0.568	0.00025764	Air quality
SO₂	0.268	0.00012156	Air quality
CO₂ non-baseload	1613.426	0.7318	Avoided-emissions estimates (not Scope 2)

Generation Mix

Solar3.1%

Wind11.6%

Nuclear3.1%

Hydro38.7%

Natural Gas24.8%

Coal16.4%

Biomass1.0%

Geothermal0.7%

kWh to CO₂ Calculator

Enter electricity consumption (kWh):

Using NWPP emission factor: 635.267 lb CO₂e/MWh = 0.2882 kg/kWh. Source: EPA eGRID2023.

Data Source & Methodology

These emission factors are from EPA eGRID2023 Rev2 (released June 2025), the official US government source for grid electricity emission rates. eGRID uses annual net generation and emissions data from all US power plants to calculate subregion-level output emission rates.

For GHG Protocol Scope 2 reporting, use the CO₂e total output emission rate: 635.267 lb/MWh or 0.2882 kg/kWh.

Get This Data via API

Query NWPP emission factors by ZIP code:

curl "https://emission-factors.com/api/lookup?zip=YOUR_ZIP"

Read the API docs - free, no key, no signup.

Subregions Serving the Same States

AZNM - WECC Southwest CAMX - WECC California MROW - MRO West RMPA - WECC Rockies

Frequently Asked Questions

What is the NWPP emission factor for Scope 2 reporting?

The NWPP eGRID2023 Scope 2 location-based emission factor is 635.267 lb CO₂e per MWh (0.2882 kg CO₂e per kWh). This is the value to use in GHG Protocol location-based Scope 2 calculations for facilities in the WECC Northwest subregion.

Which states are in the NWPP subregion?

How do I convert kWh to kg CO₂e for NWPP?

Multiply kWh by 0.2882. Example: 50,000 kWh × 0.2882 = 14410 kg CO₂e (14.41 tonnes).

Query any US ZIP code via API

33,700+ ZIP codes · All 27 eGRID subregions · EPA eGRID2023 + eGRID2024 (Cornerstone)

Read the API docs · Scope 2 guide