Which grid emission factor should a Mexican supplier use?
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.
Sources: GHG Protocol Scope 2 Guidance, IEA, electricity and emissions data by country, GHG Protocol Corporate Standard
Last reviewed 2026-10-21.