Installers and industry

If you’re interested in delivering energy efficiency measures through the Energy Company Obligation (ECO), you should contact an obligated energy supplier.

If you’re already installing measures under the scheme and are looking for standardised templates such as the Declaration of Conformity and Completed Installation, the Deemed Score Survey or the latest file naming conventions then visit the ECO reporting working group page.

If you’re looking for the latest ECO3 guidance, including the Boiler Assessment Checklist and the Electric Storage Heater Checklist, please visit our ECO3 guidance page.

What measures can be installed under ECO?

There are a wide range of energy efficiency measures that can be installed under ECO including insulation measures, heating measures and connections to district heating systems (new and upgrades). These include internal and external wall insulation systems.

You can find a list of measures in our ECO3 measures table. This provides information on eligible energy efficiency measures which suppliers can use to meet their ECO obligations.

The list of measures is non-exhaustive. Other measures may qualify, subject to review by us, on a case-by-case basis.

Additionally, under ECO3 there is the voluntary option for suppliers to meet up to 10% of their obligation with innovation measures. ECO3 has two new optional routes for supporting innovation; demonstration actions and innovation measures. In addition to innovation, suppliers will also be able to use a new monitored measures route to delivery up to 10% of their obligation.

For suppliers who wish to use the innovation routes, we will publish an application form that should be filled out and submitted to More information on innovation can be found in our Innovation Guidance which will be published in due course.

What is ECO Brokerage?

ECO Brokerage allows ECO providers to sell ‘lots’ of ECO measures to energy companies. An anonymous auction is held every fortnight where these lots are sold.

The Crown Commercial Service hosts an online e-auction allowing energy companies to bid in real-time on each auction day.

For more information, and to access the service, visit the Department of Business, Energy and Industrial Strategy’s website.

Staying compliant

Whether delivered directly or through the brokerage mechanism, ECO measures need to comply with the ECO3 Order and our scheme guidance.

Need help?

Feel free to contact us:


Publications and updates

  • Published: 14th Feb 2017
  • Open letters and correspondence
  • 1 Associated documents
This letter provides detail on Ofgem's approach to the closedown of the Carbon Saving Community Obligation (CSCO) aspect of the Energy Company Obligation (ECO) scheme.

  • Published: 10th Feb 2017
  • Investigations
  • 0 Associated documents
An update on the investigation of room in roof insulation measures installed before 28 July 2016.

  • Published: 1st Sep 2016
  • Guidance
  • 2 Associated documents
Information on room in roof insulation (RIRI) measures under ECO.

  • Published: 24th Aug 2016
  • Factsheets
  • 1 Associated documents
This note describes the ECO2 de-duplication process.

  • Published: 19th Nov 2015
  • Guidance
  • 5 Associated documents
Guidance for suppliers on technical and score monitoring for measures installed under ECO2.

  • Published: 19th Oct 2015
  • Guidance
  • 1 Associated documents
Ofgem's ECO Toolkit for installers and other third parties involved in delivering ECO measures. This suite of resources aims to improve understanding of how an ECO measure is processed.

  • Published: 17th Sep 2015
  • Open letters and correspondence
  • 2 Associated documents
This update explains how we have amended the way we let energy suppliers know if we have refused or revoked approval of an energy efficiency measure under the Energy Company Obligation (ECO).

  • Published: 22nd Jun 2015
  • Open letters and correspondence
  • 1 Associated documents
An update on key approaches and timelines for the closedown of ECO1. This includes some changes to previous guidance.

  • Published: 4th Jun 2015
  • Factsheets
  • 1 Associated documents
This document provides a summary of the approach we propose to take to the various scenarios where ECO1 loft insulation measures have been notified incorrectly.

  • Published: 22nd Apr 2015
  • Reports and plans
  • 1 Associated documents
This report presents the results of our review of hard-to-treat cavity (HTTC) measures installed under ECO in 2013.