Annual update of Emission Factor Library (EFL): Release notes 2026-11-12 (Batch 2)

This is the second batch of the 2026 annual emission factor update, released on November 12, 2026. It updates 19 lists: business travel, employee commuting, company electric and hybrid vehicles, electricity per country (Scope 2 and 3) and cloud services.

New data

• IEA Emissions Factors (2026): Country-average factors for electricity generation, T&D losses and well-to-tank emissions. CO2 for 2025 is provisional. CH4 and N2O come from 2024, the latest year IEA has for those gases.
• AIB (2026): 2025 production mixes and residual mixes for Europe. They’re used for location-based and market-based electricity factors.
• IVL (2026), report B11147: Nordic electricity mix, corrected edition from February 2026. The factor values are unchanged.
• SJ train factors are updated with IVL (2026), which calculated them for SJ, and Energimarknadsinspektionen (Ei) was reviewed with no new release: Sweden’s market-based factor is now covered by AIB (2026), and the Nordic mix keeps its Ei (2025) value.
• Now applied to the Batch 2 lists: DEFRA (2026), Cornerstone Sustainability Data Initiative (2026), NTM (2026), IVL (2026) for SJ trains, and Drivkraft Sverige, Energimyndigheten and Trafikverket (2026). The sources are described in the Batch 1 release notes.

Data changed

• UK electric vehicles: DEFRA now uses more recent UK grid data. The time lag dropped from two years to one. UK-based battery electric car and van factors are 21–33% lower.
• Electricity per country: the median change is −1.3%. About 20 countries change by 25% or more, mainly because of hydro conditions, IEA revisions to historical data and shifts in the AIB 2025 mixes. Examples are Portugal, Sweden (market-based), Costa Rica and Uruguay.
• Netherlands: there’s no market-based factor for 2026. The Netherlands is now a full-disclosure country in AIB, so no residual mix is published.
• Scope 3 electricity in Burkina Faso, Chad, Mali, Mauritania, Other non-OECD Americas and Other non-OECD Asia: these now use each region’s own IEA T&D losses instead of the World average. IEA has no upstream data for these regions, so the changes are large: Mali −89%, Chad +124%.
• US factors: these now come from Cornerstone (2026) instead of EPA. The inputs are the same. The small differences come from the move to AR6 global warming potentials.
• Swedish fuels: HVO100 is 31.6% lower (WTW). E85 is 19–25% higher.
• Car commuting, WTW (NTMCalc): the diesel, petrol and ethanol factors were recalculated to match NTMCalc. Diesel is −3.3%, petrol −7.9% and ethanol −13.3%. The TTW factors are unchanged.
• E-bikes and e-scooters: the Nordic countries fall most, with Finland at −27%. Europe (average) WTW is now fully IEA-based at 337.1 g CO2e/kWh.
• Cloud services: Estonia rises 215%. This corrects an error in the 2025 value.
• Democratic Republic of the Congo: +873% in the electricity and cloud lists, from 0.5 to 10.1 g CO2/kWh. The absolute level is still very low.
• Business travel compiled sets: 24 new DEFRA items in each set. They are car factors by size and fuel, plus average local bus and coach.

Upcoming releases

• Exiobase: spend-based global and regional cradle-to-gate factors. Expected at the end of 2026.
• Finnish Energy: average district heating factor for Finland. No date confirmed.
• CTR, HOFOR and VEKS: average district heating factor for Denmark. The source data is published, but we’re waiting for other district heating data to avoid a partial update.
• Green-e & e-Grid: US electricity generation factors. Usually published in December.
• RISE: food and beverage factors for Sweden. Usually published in December.

For more information, please see this spreadsheet. 

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