The Energy Company Obligation (ECO)

Condition 21 of the electricity supply licence requires an electricity supplier to publish specified information about:

1. fuel sources from which the electricity supplied by it has been generated; and
2. the environmental impact of generating electricity from those fuel sources.

Licensees who have supplied electricity throughout a disclosure period (1 April – 31 March) must, during the period of 12 months beginning on 1 October after the disclosure period:

• provide data relating to that disclosure period to each customer to whom it sends a bill or statement of account, by including this data on or with at least one bill or statement of account sent to the customer during those 12 months; and
• include this data in its promotional materials issued during those 12 months.

The data to be published are:

• the contribution, as a percentage, made by each energy source to the total amount of electricity purchased for supply by the licensee; and
• the environmental impact of the total amount of electricity purchased for supply by the licensee, expressed as the quantity in grams of carbon dioxide emitted and of radioactive waste produced per kWh of electricity.

When a supplier does not hold generator declarations, REGOs, or figures provided by electricity exchanges for some of its electricity supplied they should apportion the amount of electricity in accordance with the residual fuel mix percentages in BEIS’s Fuel Mix Disclosure.

The Fuel Mix Disclosure Data Table will be compiled and updated annually by BEIS and will be published on its website by 1 August each year. This table includes the table for the residual mix, which is compiled by BEIS based on the best available information on the actual mix of electricity not subject to generator declarations or REGOs after consulting major suppliers.

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