
1 
These Regulations may be cited as the Clean Heat Market Mechanism (Amendment) Regulations 2025.
2 

(1) These Regulations come into force on 12th December 2025, subject as follows.
(2) Regulation 8 comes into force on 1st April 2026.
3 
These Regulations extend to England and Wales, Scotland and Northern Ireland.
4 
The Clean Heat Market Mechanism Regulations 2025 are amended in accordance with the following provisions.
5 
In regulation 2(1), for the definition of “certification scheme”, substitute—“
 “certification scheme” has the meaning given in regulation 6;”.
6 
In regulation 4(1), in sub-paragraph (b)—
(a) omit “both”,
(b) for “and hot water heating”, substitute “whether or not it also provides hot water heating”.
7 
For regulation 6, substitute—“
6 

(1) The certification scheme is the Microgeneration Certification Scheme.
(2) The Secretary of State may approve a subsequent version of the Microgeneration Certification Scheme as the certification scheme.
(3) The Secretary of State, when exercising the power in paragraph (2), must publish—
(a) the details of any subsequent version of the Microgeneration Certification Scheme which is approved under paragraph (2);
(b) the date from which the subsequent version of the Microgeneration Certification Scheme is approved;
(c) the details of any transitional arrangement to the subsequent version approved under paragraph (2).
(4) In this regulation “Microgeneration Certification Scheme” means the scheme under that name operated by the MCS Service Company Ltd (a company registered in England and Wales with company number 07759366).”.
8 
In regulation 12(2)—
(a) in sub-paragraph (a), for “6%”, substitute “8%”;
(b) in sub-paragraph (b), for “6%”, substitute “8%”.
Martin McCluskey
Parliamentary Under-Secretary of State
Department for Energy Security and Net Zero 
18th November 2025