Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, how solar schemes that contribute to residential energy efficiency are accounted for when measuring energy performance certificate ratings.

Solar photovoltaic (PV) is currently reflected in the domestic Energy Performance Certificate (EPC) rating, which is based on energy costs. Electricity generated by PV is assigned a value and deducted from the property’s energy cost, improving the EPC Rating.

Government is reforming EPCs to better align them with our Clean Power and Net Zero objectives. Our December 2024 consultation proposed moving from one metric to four complementary metrics, together highlighting the main aspects of a home’s energy performance. Alongside retaining an energy cost metric, this includes a Smart Readiness metric that would reflect a home’s ability to generate electricity, such as from solar PV. A response to the consultation will be published in due course.