Energy v1.5

• Climatiq has released a minor update to the energy feature, which is now available. The update brings in the 2026 edition of the IEA emission factors, refreshes Australian and US supplier electricity data, and improves how fuel combustion emission factors are chosen for biogenic fuels.
• This is a non-breaking change from v1.4, and so you can just update the URL you use and immediately start using it. This is released as a separate version, so that you have control over when to adopt the changes which can result in material changes to your estimations.
• This is the changelog & upgrade guide for v1.5. See our API versioning guide for how API versioning works at Climatiq.
• This document lists the changes between v1.4 and v1.5.

Changes between v1.4 and v1.5

Updated data

All of the energy endpoints now use data release 39, up from data release 37 in v1.4. Expect emission factors to update in some regions as sources publish newer figures.

Electricity

IEA 2026 edition (data year 2024)

If you have a license for the premium IEA dataset, the 2026 edition of the IEA emission factors is now used. Final (non-provisional) data for 2024 is now available, so generation, transmission and distribution, and well-to-tank factors move from 2023 to 2024 for 205 regions.

Updated Australian data

Australia (AU) and its states now use the DISER 2026 National Greenhouse Accounts Factors, in place of the 2025 edition, for generation, well-to-tank and transmission and distribution factors.

New region

AU-NWIS (the North Western Interconnected System in Western Australia) is now supported by core data, with generation, well-to-tank and transmission and distribution factors from DISER. The previous, misspelt code AU-NWSI is still accepted but is no longer updated, so use AU-NWIS instead.

Updated US supplier data

US supplier-specific factors now use EEI 2026. This adds 2025 factors for 45 suppliers, and updates factors for earlier years where EEI has restated them.

Renamed supplier ID

The supplier avista_corporation_avista_utilities (in US-ID, US-MT, US-OR and US-WA) is now listed as avista_corporation. The old ID is still accepted and returns the factors previously published under it, up to 2024. Use the new ID to get the 2025 factor and any later updates.

Heat and Steam

Updated well-to-tank factors for Germany

The well-to-tank factors for Germany (DE) have been updated.

Fuel Combustion

Biogenic fuels prefer factors that report biogenic emissions

For fuels that are chiefly biogenic, identified by bio in the fuel_type (for example biodiesel_bio_100), combustion emission factors that report biogenic CO2 emissions are now preferred. This preference is applied after matching the region, and before matching fuel_use and year. As a result, more biogenic fuel estimates include biogenic_product_emissions_co2e in additional_indicators, and the co2e value can change significantly as the biogenic CO2 is reported separately.

Belgium and the Netherlands fall back to each other

Where no fuel emission factor is available for Belgium (BE), factors for the Netherlands (NL) are now used before falling back to other regions, and vice versa. A no_region_match notice is still included in the response when this happens.

Updated Australian and US data

Australian fuel factors now come from the National Greenhouse Accounts Factors 2026; values are essentially unchanged. US well-to-tank factors have been updated from 2025 to 2026.