Who Redeems Britain’s Renewable Certificates
Who redeems Britain’s renewable certificates
Ofgem issues one Renewable Energy Guarantee of Origin (REGO) for each megawatt hour of eligible renewable generation. A supplier redeems certificates to support its annual renewable electricity claim. The latest complete compliance year is shown first below.
Who redeemed certificates for 2026/27
The 1 largest of 1 certificate holders that redeemed anything against generation in this Fuel Mix Disclosure year. Redeeming is the act that lets a supplier describe supply as renewable; the other statuses further down are not that.
This is the newest compliance year with any redemptions in the register, not a final full-year table. It is a live partial view and can keep filling after the compliance year ends.
| Certificate holder, as published | Certificates redeemed | Share of the year |
|---|---|---|
| Opus Energy Renewables Ltd | 1,279 | 100.0% |
These are the legal entities that hold the certificates, spelled as the register spells them. One corporate group can hold under several, and this page does not merge them — doing so would need an effective-dated record of which entity belonged to which brand in which year, which does not exist here. Nor is a share of certificates a share of households: the register covers business supply too and carries no customer denominator at all.
What those certificates were generated by
- Solar PV
- 100.0%1,279 certificates
Every technology in this list is renewable under the scheme’s own rules. That includes burning things: a certificate from a biomass plant and one from an offshore wind farm are interchangeable when a supplier redeems them, and a tariff label does not distinguish between them.
Contains public sector information licensed under the Open Government Licence v3.0. Source: Ofgem Renewable Electricity Register. Renewable Electricity Register: REGO certificates public report
What a redeemed certificate proves
Redemption proves that renewable electricity was generated and that one company may count the certificate. It does not prove that the company financed or caused the generation, because certificates can be traded separately from the electricity.
Why these are company names, not brands
Ofgem publishes legal entities rather than consumer brands, and one group may use several entities. The page therefore uses the register names and does not treat certificate share as customer market share.
For what all of this adds up to for a household — what the electricity nobody claimed is actually made of — see what a green tariff actually buys.
Frequently asked questions
What is a REGO?
A Renewable Energy Guarantee of Origin. Ofgem issues one for each megawatt hour of eligible renewable generation, and it is a tradable record that the generation happened. A supplier that redeems enough REGOs to cover what its customers used may describe that supply as renewable in its annual Fuel Mix Disclosure.
Does redeeming a certificate mean the supplier caused renewable generation?
No. A REGO is created by the act of generating and can be sold separately from the electricity itself, so redeeming one is a claim on generation that already happened rather than a cause of it. The register shows this directly: certificates are redeemed months and sometimes years after the electricity was made, and a substantial number expire with nobody claiming them at all — that generation still reached the grid.
Is “Redeemed” the same as “Retired”?
No, and it is the easiest mistake to make with this register because the two words are near-synonyms in ordinary English. A certificate is Redeemed when it is used to back a Fuel Mix Disclosure claim. It is Retired when it is withdrawn from circulation without such a claim. Expired means it lapsed unused. This page keeps all three apart, because adding Retired to Redeemed overstates what suppliers claimed by roughly half again.
Why are the names on this page not the brands I recognise?
Ofgem publishes the legal entity that holds the certificate, sometimes with its supply licence reference. One corporate group can use several entities. There is no reliable public mapping from every entity to its consumer brand for every year, so the register’s own wording is shown.
Does a big share of certificates mean a big share of customers?
No. The register covers business and industrial supply as well as households, and it carries no customer numbers at all. A share here is a share of certificates redeemed, and nothing about it can be read as market share.
