Energy suppliers have legal obligations under the Energy Company Obligation (ECO) scheme if they:
- have more than 250,000 domestic customers
- provide more than 400 gigawatt hours of electricity or more than 2,000 gigawatt hours of gas.
When do suppliers become obligated?
In December each year, we ask suppliers to tell us how many customers they have and how much energy they supply. If they reach the two eligibility thresholds above, the supplier becomes obligated under the following year of the scheme, which usually begins in April.
We offer advice and assistance to all newly obligated suppliers to make sure they’re prepared to take part in the scheme.
What are suppliers’ responsibilities?
Suppliers are responsible for meeting their obligations and ensuring that they, and any members of the supply chain acting on their behalf, comply with the scheme requirements.
How are suppliers’ targets worked out?
As scheme administrator, we’re responsible for setting suppliers’ obligations. We do this using a calculation based on their share of the gas and electricity supply market. This is determined by ECO legislation.
The ECO register
Each month, obligated energy suppliers notify us of the measures they’ve delivered by uploading them to the ECO register.
Where do I find out more?
You can find more detailed information in the Contacts, guidance and resources section of our website. This includes our official ECO2 guidance, as well as information on ECO2 Monitoring, the AWG Guidance note, ECO2 Appropriate Guarantees and key templates and checklists.
The ECO reporting working group section of our website also contains key standardised ECO templates such as the Declaration of Conformity and Completed Installation and AWG and Private Domestic Premises Checklist.