Commercial solar in Westminster

Solar in Westminster in figures

What the figures show

Capacity in Westminster has grown by 394% since the end of 2020, faster than the UK as a whole (69%). In 2025 alone it rose from 5.5 MW to 6.8 MW.

There are 10.9 installations for every 1,000 households, below the London median of 22.2 and below the UK median of 67.0. That is 358th of 361 council areas, and 30th of 33 in London.

At 6.6 kW on average, most installations here are home-sized, so business roofs make up a small share of what is installed so far.

What a business roof in Westminster could generate

Modelled with PVGIS for the centre of Westminster, a south-facing roof at 30 degrees produces about 1,012 kWh per kWp a year. That is 163rd of 361 council areas; the UK median is 998 kWh.

Same sums as our commercial solar calculator: illustrative, not a quote. East- or west-facing roofs, shading and how much power you use in daylight all move these figures, and a company paying corporation tax can usually shorten the payback with capital allowances. See the cost guide for price ranges by system size.

Planning and grid connection

Westminster follows the national planning rules for England. Permitted development rights for non-domestic rooftop solar were widened in December 2023, including removal of the old 1 MW limit, but conditions still apply, especially for listed buildings and conservation areas. Ground-mounted arrays and carports usually need an application to the council, or to a national park authority inside a national park. Our planning permission guide sets out the conditions.

Most commercial systems need G99 approval from the local network operator before they are switched on. The operator follows the postcode rather than the council boundary: our London page covers the operators in the region, and the Energy Networks Association postcode tool confirms yours. See G99 and DNO applications.

For funding, see grants and reliefs in England.

Nearby council areas

• Kensington and Chelsea, about 2 miles away
• Camden, about 2 miles away
• City of London, about 2 miles away
• Islington, about 3 miles away
• Hammersmith and Fulham, about 3 miles away
• Lambeth, about 4 miles away

Or see every council area and the London page.

Where these figures come from

Installations, capacity, generation and households: Department for Energy Security and Net Zero, Regional Renewable Statistics, renewable electricity by local authority 2014 to 2025 (workbook). They cover all solar PV, homes and businesses, including ground-mounted schemes. Yield: PVGIS 5.3 (European Commission Joint Research Centre), SARAH3 data and 14% system losses, for the council area's centre point (ONS boundaries, December 2024), modelled 4 November 2026. Distances are between centre points.