What is a green electricity tariff?

A green electricity tariff is a supply product marketed with renewable electricity attributes, often evidenced by REGO certificates. Ofgem issues 1 certificate per megawatt-hour of eligible renewable output [S1]. That evidence concerns generation attributes; it does not create a dedicated renewable wire to your premises [S3]. Check the documentation and reporting method before making a business claim. Checked October 2026.

Last checked 19 October 2026

What does a green electricity tariff mean?

A green electricity tariff is an electricity supply product marketed with renewable energy attributes, commonly supported by REGO certificates evidencing renewable generation [S1].

Why it matters for your site: a tender response saying your business uses renewable electricity needs a defined claim and supporting records. A tariff label alone does not establish the result under your carbon-reporting method [S2].

Ofgem issues 1 REGO for each megawatt-hour of eligible renewable output. Its main use is fuel-mix disclosure, which tells customers the sources used for the electricity supplied [S1].

Does green electricity arrive through a separate supply?

Grid-connected customers receive electricity from the shared system. Ofgem’s green-tariff proposals explain that choosing a renewable product does not change the physical mixture delivered through the network. That document concerns domestic offers; the physical grid distinction also helps explain a business claim [S3].

On-site solar is a different arrangement: generation occurs at your premises. For reporting, establish who retains the renewable attributes before describing that electricity as yours to claim [S2]. Use the Scope 2 reporting guide for the wider evidence process.

What does the renewable claim leave unresolved?

It does not establish that every charging session coincides with renewable generation. Ask what period the certificate evidence covers. GHG Protocol applies quality criteria to instruments used in market-based electricity accounting [S2].

Electricity and gas claims also need separating. Ofgem administers renewable electricity certificates and the Green Gas Support Scheme as different programmes [S1]. Do not carry an electricity claim across to boiler fuel.

Read emissions scopes and grid carbon intensity before choosing wording for customers. Keep price context separate using business electricity data.

Next step

Use your energy cost goal to identify what on-site equipment should achieve, then get matched with an installer that covers your area.

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