ECO guidance and associated documents

Here you can access guidance and publications on the ECO scheme.

What our guidance does

It outlines:

  • how we determine which suppliers are obligated
  • how obligated suppliers can meet their obligations
  • when and what suppliers need to report on, and
  • information on ECO measures.

The ECO3 scheme commenced on 3 December 2018 and runs until 31 March 2022. The documents below apply to all measures installed on or after 1 October.

You can find guidance on delivering ECO measures amidst COVID-19 on our ECO Amidst COVID-19 page.

What it doesn’t do

It’s not intended as a definitive guide to the ECO3 Order.

Previous ECO schemes

Any measures installed between 1 April 2017 and 30 September 2018, should comply with our ECO2t guidance and associated documents.

Any measures installed between 1 April 2015 and 31 March 2017, should comply with our ECO2 guidance and associated documents.

If you’re unable to find the document you are looking for, contact the ECO team who will be happy to help.

ECO3 Key Scheme Resources (From 1 October 2018)


Date Published

Energy Company Obligation 2018-22 (ECO3) Guidance: Supplier Administration

31 October 2018

Energy Company Obligation 2018-22 (ECO3) Guidance: Delivery

15 November 2018

Energy Company Obligation (ECO3) Guidance: Innovation 5 February 2019



Date Published

ECO3 Pre-existing Loft Insulation Declaration

27 September 2018

ECO3 Social housing E, F and G declaration & landlord permission

28 September 2018

ECO3 Private housing FTCH declaration & private rented sector landlord permission

28 September 2018

ECO3 Boiler Assessment Checklist

02 October 2018

ECO3 Electric Storage Heater Checklist

02 October 2018

ECO3 Privacy policy

10 October 2018

ECO3 Child Benefit self-declaration

16 October 2018

ECO3 Data Dictionary

19 October 2018

ECO3 Appropriate Guarantees

14 November 2018

ECO3 Measures Table

15 November 2018

ECO3 Deemed Scores Matrix

30 November 2018

ECO3 Notification Template

3 December 2018

ECO3 Templates to evidence private domestic premises

3 December 2018

ECO3 Monitoring

25 January 2019

ECO3 Notice of receipt of an application for extension

31 January 2019

ECO3 Address formatting guidance note

31 January 2019

ECO3 Notifying a supplier of a decision to refuse or revoke approval of a measure

31 January 2019

ECO3 Alternative methodologies

31 January 2019

ECO3 District Heating Pre-Conditions (Insulation): Technical Report Template

28 March 2019

ECO3 District heating systems (DHS) factsheet and summary of proposal (SoP)

29 March 2019

ECO3 Toolkit

15 May 2019

ECO3 First Time Central Heating Checklist

16 October 2020

Publications and updates

  • Published: 30th Jan 2015
  • Guidance
  • 1 Associated documents
This document provides information to assist suppliers when completing the monthly notification template under ECO2.

  • Published: 14th Jan 2015
  • Consultations and responses
  • 2 Associated documents
Response to our consultation on specific HHCRO requirements

  • Published: 14th Jan 2015
  • Guidance
  • 1 Associated documents
HHCRO requirements: Guidance notes on specific Home Heating Cost Reduction Obligation (HHCRO) for ECO2.

  • Published: 20th Nov 2014
  • Guidance
  • 1 Associated documents
This publication is for ECO1 reference only and applies to measures installed on or before 31 March 2015.

  • Published: 22nd May 2014
  • Other
  • 0 Associated documents
This page provides details of Ofgem templates which we have produced or updated to reflect suggestions from the working group.

  • Published: 15th Jan 2013
  • Other
  • 1 Associated documents
This document describes CSV file format specification for information exchange from Energy Suppliers to Ofgem IT Systems.