AZNM eGRID Subregion - WECC Southwest Emission Factor (2023)

EPA eGRID2023 Rev2 · States: AZ, NM, NV, TX · Average

Southwest US grid covering Arizona, New Mexico, southern Nevada and west Texas. This page provides the official EPA eGRID2023 electricity emission factors for the AZNM subregion, used for GHG Protocol Scope 2 location-based emissions reporting.

Emission Factors

706.189

lb CO₂e / MWh

0.3203

kg CO₂e / kWh

40.22%

Carbon-free

22.26%

Renewable

The AZNM subregion is 8% cleaner than the US average (770.9 lb CO₂e/MWh).

All Pollutants

Pollutant	lb / MWh	kg / kWh	Scope
CO₂e (total GHG)	706.189	0.3203	Scope 2
CO₂	703.703	0.3192	Scope 2
CH₄ (methane)	0.039	0.00001769	Scope 2
N₂O (nitrous oxide)	0.005	0.00000227	Scope 2
NO_x	0.36	0.00016329	Air quality
SO₂	0.103	0.00004672	Air quality
CO₂ non-baseload	1175.094	0.5330	Scope 2 (marginal)

Generation Mix

Solar8.2%

Wind7.7%

Nuclear18.0%

Hydro2.6%

Natural Gas48.6%

Coal11.1%

Geothermal3.6%

kWh to CO₂ Calculator

Enter electricity consumption (kWh):

Using AZNM emission factor: 706.189 lb CO₂e/MWh = 0.3203 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: 706.189 lb/MWh or 0.3203 kg/kWh.

Get This Data via API

Query AZNM emission factors by ZIP code:

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

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

Neighboring Subregions

CAMX - WECC California ERCT - ERCOT NWPP - WECC Northwest SPSO - SPP South

Frequently Asked Questions

What is the AZNM emission factor for Scope 2 reporting?

The AZNM eGRID2023 Scope 2 location-based emission factor is 706.189 lb CO₂e per MWh (0.3203 kg CO₂e per kWh). This is the value to use in GHG Protocol location-based Scope 2 calculations for facilities in the WECC Southwest subregion.

Which states are in the AZNM subregion?

The AZNM (WECC Southwest) eGRID subregion covers: AZ, NM, NV, TX. Southwest US grid covering Arizona, New Mexico, southern Nevada and west Texas.

How do I convert kWh to kg CO₂e for AZNM?

Multiply kWh by 0.3203. Example: 50,000 kWh × 0.3203 = 16015 kg CO₂e (16.01 tonnes).

Query any US ZIP code via API

33,616 ZIP codes · All 27 eGRID subregions · EPA eGRID2023 + 2024 preliminary

Read the API docs · Scope 2 guide