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

To ask the Secretary of State for Business, Energy and Industrial Strategy, what has been the cost reduction in (a) rooftop solar PV and (b) ground-mount PV since 2010.

The Department has publishes two sets of estimates of the cost of solar PV over time:

1) Outturn statistics on the cost of installations below 50kW capacity in each financial year since April 2013. These statistics are based on installations that are registered on the Microgeneration Certification Scheme (MCS), and do not differentiate between rooftop and ground-mounted PV although the majority relates to rooftop. These are available at: https://www.gov.uk/government/statistics/solar-pv-cost-data.

2) Projections of current and future installation costs across a number of capacity sizes, from 2010 onwards. These are based on reports commissioned by the Department, and are available at: https://www.gov.uk/government/collections/energy-generation-cost-projections.