Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what estimate she has made of the proportion of UK household with solar thermal panels installed (a) as of 4 September 2023, (b) in July 2013 and (c) in July 2011.

The Government does not hold comprehensive information on the number of households with solar thermal panels installed.

However, solar thermal systems installed under Government grants have been recorded on the Microgeneration Certification Scheme Database (MID). The number of solar thermal installations recorded in the MID is:

• 2,924 in July 2011 (approximately 0.01% of total households).
• 7,589 in July 2013 (approximately 0.03% of total households).
• 20,714 in July 2023 (approximately 0.07% of total households).

The MID does not include all solar thermal installations. For example, systems installed without Government funding support are not typically recorded in the MID.