Question to the Department for Business, Energy and Industrial Strategy:

To ask the Secretary of State for Business, Energy and Industrial Strategy, what recent estimate his Department has made of the average return on investment for lifetime of usage of solar thermal systems; and for what reasons those systems are included in the Green Homes Grant Scheme.

The average return on investment for solar thermal systems will depend on a range of factors including whether the owner of the solar thermal installation is in receipt of grant funding (such as the domestic Renewable Heat Incentive) or not.

The measures in the scheme were chosen because they deliver: demand for the energy efficiency sector, creating and preserving jobs; lasting carbon emission savings that contribute to reaching net zero; energy efficiency installations which are high quality and represent good value for money; and create long-term growth in the energy efficiency supply chain.