ECO4 Delivery guidance
Summary
Ofgem published version 4.0 of the ECO4 Delivery guidance, updated to reflect the government's extension of the scheme to 31 December 2026. The guidance covers supplier obligations, household and measure eligibility, scoring, monitoring, and audit processes. This is an operational update to an existing supplier obligation, not a structural change to energy markets.
Why it matters
ECO4 is a redistributive mechanism that loads insulation costs onto energy bills via supplier obligations. The scheme extension continues the pattern of using bill-funded levies rather than fiscal spending for fuel poverty measures — costs that fall on all consumers regardless of ability to pay.
Key facts
- •ECO4 scheme extended to 31 December 2026
- •Delivery guidance version 4.0 published 26 March 2026
- •Covers measure eligibility, scoring, monitoring, and counter-fraud
Timeline
Areas affected
Related programmes
Memo
ECO4 Delivery guidance | Ofgem Please enable JavaScript in your web browser to get the best experience. BETA This site is currently in BETA. Help us improve by giving us your feedback . Close alert: ECO4 Delivery guidance Publication type: Guidance Publication date: 7 August 2025 Last updated: 26 March 2026 Scheme name: ECO Show all updates Print this page Related links ECO4 Contacts, guidance and resources Share the page Share on Facebook Share on Twitter Share on LinkedIn T he ECO4 Delivery guidance and measures table are for suppliers and the supply chain. They provide guidance on the fourth Energy Company Obligation scheme, ECO4 , including: how a supplier meets its obligations the eligibility of different homes and the households that occupy them the eligibility of different energy efficiency measures the measure and project notification processes measure and project scores technical and score monitoring auditing and counter-fraud processes This guidance document has been updated to reflect the government’s extension to the ECO4 scheme to 31 December 2026. See the summary of updates document for summaries of changes between versions of the Delivery Guidance and Measures Table. You can find other ECO4 guidance documents on our Contacts, guidance and resources page . Please note that the ECO4 delivery guidance document attached below is not fully accessible. If you require an alternative format, please contact ECO@ofgem.gov.uk . Main document ECO4 Delivery guidance version 4.0 [PDF, 2.77MB] Subsidiary documents ECO4 Measures Table v4.0 [XLSX, 82.46KB] Summary of updates to ECO4 delivery guidance and measures table [PDF, 341.26KB] Print this page Related links ECO4 Contacts, guidance and resources Share the page Share on Facebook Share on Twitter Share on LinkedIn All updates 26 March 2026 added updated guidance document and summary of updates. Close