CAMX eGRID Subregion - WECC California Emission Factor (2023)

EPA eGRID2023 Rev2 · States: CA, NV · Clean

California grid (CAISO) - one of the cleanest large US grids due to solar and hydro. This page provides the official EPA eGRID2023 electricity emission factors for the CAMX subregion, used for GHG Protocol Scope 2 location-based emissions reporting.

Emission Factors

429.983

lb CO₂e / MWh

0.1950

kg CO₂e / kWh

54.34%

Carbon-free

46.36%

Renewable

The CAMX subregion is 44% cleaner than the US average (770.9 lb CO₂e/MWh).

All Pollutants

Pollutant	lb / MWh	kg / kWh	Scope
CO₂e (total GHG)	429.983	0.1950	Scope 2
CO₂	428.464	0.1943	Scope 2
CH₄ (methane)	0.025	0.00001134	Scope 2
N₂O (nitrous oxide)	0.003	0.00000136	Scope 2
NO_x	0.332	0.00015059	Air quality
SO₂	0.02	0.00000907	Air quality
CO₂ non-baseload	958.303	0.4347	Scope 2 (marginal)

Generation Mix

Solar20.0%

Wind6.6%

Nuclear8.0%

Hydro14.1%

Natural Gas42.8%

Coal2.1%

Biomass2.2%

Geothermal3.6%

Other Fossil0.7%

kWh to CO₂ Calculator

Enter electricity consumption (kWh):

Using CAMX emission factor: 429.983 lb CO₂e/MWh = 0.1950 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: 429.983 lb/MWh or 0.1950 kg/kWh.

Primary utility: Pacific Gas & Electric

Get This Data via API

Query CAMX 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

AZNM - WECC Southwest NWPP - WECC Northwest

Frequently Asked Questions

What is the CAMX emission factor for Scope 2 reporting?

The CAMX eGRID2023 Scope 2 location-based emission factor is 429.983 lb CO₂e per MWh (0.1950 kg CO₂e per kWh). This is the value to use in GHG Protocol location-based Scope 2 calculations for facilities in the WECC California subregion.

Which states are in the CAMX subregion?

The CAMX (WECC California) eGRID subregion covers: CA, NV. California grid (CAISO) - one of the cleanest large US grids due to solar and hydro.

How do I convert kWh to kg CO₂e for CAMX?

Multiply kWh by 0.1950. Example: 50,000 kWh × 0.1950 = 9750 kg CO₂e (9.75 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