Definition: MCS (Microgeneration Certification Scheme) is the UK quality standard for small-scale renewable installations and installers — required for grants like the Boiler Upgrade Scheme and for SEG payments.

Why it matters

Only MCS-certified installers can register installations for the BUS grant, and SEG suppliers require an MCS certificate before paying export tariffs. It covers solar PV, heat pumps, battery storage and more.

How to check

Search the installer on the MCS website before signing anything. A certified company has an MCS number and is backed by a consumer code such as HIES or RECC.

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