Great British Insulation Scheme Guidance: Supplier Administration
Guidance
- Publication date
- Scheme name
- Great British Insulation Scheme
The Great British Insulation Scheme (GBIS) is a government energy efficiency scheme for Great Britain, administered by Ofgem.
Our guidance documents provide information on the legislative requirements of the ECO4A Order and our administrative processes.
The ECO4A Order (parts 1 to 9) commenced on 25 July 2023 and runs until 31 March 2026.
- Great British Insulation Scheme Guidance: Supplier Administration
- Great British Insulation Scheme Guidance: Supplier Delivery
- Great British Insulation Scheme Data Dictionary
- Great British Insulation Scheme forms and tables
- Great British Insulation Scheme and ECO4 Local Authority Administration Guidance
- Great British Insulation Scheme and ECO4 LA and Supplier Flex Forms and Subsidiary Documents
The Supplier Administration guidance is aimed mainly at suppliers, describing the processes that suppliers and Ofgem follow to meet the requirements of the ECO4A Order. It addresses the following:
- when a supplier is obligated under The Great British Insulation scheme
- notifying customer numbers and supply and how obligations are set
- details of carry over, carry under and early delivery of measures
- details on trading obligations, inter and intra supplier trading
- how suppliers notify completed measures
- details on transfers of measures, inter and intra supplier transfers
- details on reassigning annual bill savings from ECO4 to GBIS
- details on the end of the obligation period and achieving your obligation
- our role as the ECO administrator
This guidance document has been updated to reflect changes as a result of amendments made to the ECO4A Order in 2025 as well as general formatting and drafting improvements. Further details of the updates contained in this version are provided in the separately published subsidiary document below.