Energy Company Obligation 2017-18 (ECO2t) Guidance: Administration


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The Energy Company Obligation is a government energy efficiency scheme for Great Britain, administered by Ofgem. Our guidance documents provide information on the legislative requirements of the ECO2 Order and our administrative processes.

An extension to the obligation period for ECO2 was established under The Electricity and Gas (Energy Company Obligation) (Amendment) Order 2017. The extension to the obligation period runs from 1 April 2017 to 30 September 2018 and is referred to as ECO2t.

This document provides guidance on how we will administer the ECO scheme in line with the new ECO2t requirements for measures installed from 1 April 2017.

For measures installed before 1 April, please refer to our ECO2 guidance Delivery and Administration, Versions 1.1.           

We have split the ECO2t Guidance into two parts.

1. ECO2t Guidance: Administration, and

2. ECO2t Guidance: Delivery.

The administration guidance is aimed mainly at suppliers, describing the processes that suppliers and Ofgem follow to meet the requirements of the ECO2 Order. It addresses the following:

  • when a supplier is obligated under ECO2t and how its obligations are set
  • details of the provisional solid wall minimum requirement and solid wall minimum requirement
  • details of the home heating minimum requirement
  • how suppliers notify completed ECO measures
  • the application process for trading obligations
  • the application process for transfers and re-elections, and
  • our role as the ECO administrator.

The table below lists the current and previous versions of the ECO2 Guidance: Administration and the dates they came into effect. Where the reissuing of this guidance document is to incorporate or align with documents that have already been published, the original date of effect of those documents is unaffected.

Document name

Document date of effect
Energy Company Obligation 2017-18 (ECO2t) Guidance: Administration (Version 1.0) 1 April 2017
Energy Company Obligation 2015-17 (ECO2) Guidance: Administration (Version 1.1) 1 December 2015
Energy Company Obligation 2015-17 (ECO2) Guidance: Administration (Version 1.0) 1 April 2015

Document updated December 2017

Version 1.1 of this guidance includes corrections and updates to the previous version. Details of changes can be found in the summary of updates to guidance document which can be found below.