Ask the supplier to show how much of your metered electricity use the tariff covers and what evidence you will receive after the reporting period. If you have several sites, ask whether the evidence lists individual meters or provides a single allocation for the contract. Read Ofgem’s REGO scheme guidance.

When comparing business green electricity tariffs, ask what your supplier will match to your consumption and what evidence it will give you at the end of the reporting period. A green tariff label on its own tells you little about the contract terms or the evidence behind the claim.

What a REGO shows

Ofgem issues one Renewable Energy Guarantee of Origin, or REGO, for each megawatt hour of eligible renewable electricity generated. Suppliers use REGOs for fuel mix disclosure. They document renewable generation and matching, while electricity reaching your premises comes from the shared grid.

What to ask a supplier

  • Which sites, consumption and dates will the evidence cover?
  • What records will you provide, and when?
  • How do you handle volumes that differ from the original forecast?
  • Does the contract include a separate commitment to buy electricity from a named generator?

See Ofgem’s REGO guidance or use the renewable electricity evidence checker to compare documented volumes with your consumption.

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