# Which grid emission factor should a Mexican supplier use?

Canonical: https://senseible.earth/answers/mexico-grid-emission-factor-for-suppliers

Use the national electricity system emission factor published each year by Mexico's environment and energy authorities, for the year the power was used, and cite it. Recent figures are a little over 0.4 kg of CO2 per kWh, reflecting a gas heavy grid.

## Which number for which question

- Location based Scope 2: the official national factor for the year.
- Market based Scope 2: clean energy certificates or a supply contract meeting the Scope 2 Quality Criteria.
- CBAM: for cement and fertilisers the electricity factor changes the cost; for steel and aluminium electricity is not charged.

## Keep it auditable

Record the publication, its year and the value. Do not mix years in one report, and update when the new figure is out.

## What Senseible does here

Senseible reads each site's monthly electricity bills into a dated, fingerprinted Scope 2 record. Grid factors outside India are entered from the official source for the country and year, and are labelled with that source.

- [Free grid factors by country](https://senseible.earth/answers/free-grid-emission-factors-by-country)
- [Bajio auto parts and CBAM goods](https://senseible.earth/answers/bajio-auto-parts-shipment-cbam-goods)
- [Vietnam grid factor](https://senseible.earth/answers/vietnam-grid-emission-factor-for-suppliers)

Sources: [GHG Protocol Scope 2 Guidance](https://ghgprotocol.org/scope-2-guidance), [IEA, electricity and emissions data by country](https://www.iea.org), [GHG Protocol Corporate Standard](https://ghgprotocol.org/corporate-standard)

Last reviewed 2026-10-21.