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

To ask the Secretary of State for Business, Energy and Industrial Strategy, whether his Department holds data on how many and what proportion of heat network suppliers are registered with the Heat Trust (a) in total and (b) operating in Battersea.

Data on Heat Trust membership is owned by Heat Trust rather than BEIS. Heat Trust publishes information on registered participants and sites here: https://heattrust.org/members.

BEIS does not currently publish data on the number of unique heat suppliers, but does publish estimates for the number of heat network sites. BEIS has not estimated a breakdown of heat network sites by constituency, but has published a breakdown by local authority. The most recent published data identified 13,995 heat networks in the UK, of which 111 heat networks were identified in the local authority of Wandsworth (https://www.gov.uk/government/publications/energy-trends-march-2018-special-feature-article-experimental-statistics-on-heat-networks).