No.125 of 650 · approved, not built MP: John Milne (Liberal Democrat) England

Horsham

Horsham has 51 MW of clean power (all solar) approved and still not built: enough to supply a year's electricity to 19,000 homes. Britain's grid bottlenecks still add to bills here: about £92 a year per household, £4.0m across the constituency's 43,452 homes. A 57 MW battery was refused planning here in 2024; while discharging it could have supplied about 200,000 homes.

Not visible
here

No big wind farm on the national grid is mapped to this constituency, so no switch-off payments show here in national data. Smaller wind farms on the local grid can still be paid to switch off — invisibly. The £ figure for this seat is a floor, not a zero.

how we worked this out

51 MW

of clean power — all solar — approved and still not built, enough to supply a year's electricity to 19,000 homes. Approved at least two years ago; waiting on the grid, not on planning. That is 2.0× the renewable capacity actually running here.

8 projects · planning database (REPD), July 2026 · how we worked this out

£4.0m

is what the grid gap costs this constituency's 43,452 households in a year between them — £92 each, about 51 days of one home's electricity.

The £92 per household is a national figure — identical in every GB seat. Only the seat total varies, with the number of households · NESO · how we worked this out

The waiting list

6 of 8 waiting projects · years since approval

St Hughs Monastery, Henfield Road - Solar Array 0.2 MW

3.8 YRS

Broadlands Business Campus, Langhurst Wood Road - Solar Panels Phase 3 0.5 MW

3.2 YRS

Broadlands Business Campus, Langhurst Wood Road - Solar Panels Phase 2

3.2 YRS

Skylark House, St Marks Lane - Solar Panels 0.1 MW

2.8 YRS

Unit 24, Star Road Industrial Park - Solar Panels 0.3 MW

2.7 YRS

Unit 1a & B, Star Road Industrial Park - Solar Panels 0.2 MW

2.7 YRS

Every approved, unbuilt project

approved 24+ months ago, still not generating · planning database, July 2026

Site	Technology	Enough for	Capacity	Approved	Waiting
Cobwood Solar Farm, Burnthouse Lane - Solar Farm & Battery Storage	Solar Photovoltaics	18,000 homes	49.9 MW	2024-05	2.2 yrs
Broadlands Business Campus, Langhurst Wood Road - Solar Panels Phase 3	Solar Photovoltaics	200 homes	0.5 MW	2023-05	3.2 yrs
Unit 24, Star Road Industrial Park - Solar Panels	Solar Photovoltaics	100 homes	0.3 MW	2023-12	2.7 yrs
Start Road Industrial Park, Star Road - Solar Panels	Solar Photovoltaics	100 homes	0.2 MW	2024-02	2.5 yrs
St Hughs Monastery, Henfield Road - Solar Array	Solar Photovoltaics	100 homes	0.2 MW	2022-10	3.8 yrs
Unit 1a & B, Star Road Industrial Park - Solar Panels	Solar Photovoltaics	100 homes	0.2 MW	2023-12	2.7 yrs
Skylark House, St Marks Lane - Solar Panels	Solar Photovoltaics	100 homes	0.1 MW	2023-10	2.8 yrs
Broadlands Business Campus, Langhurst Wood Road - Solar Panels Phase 2	Solar Photovoltaics	—	— MW	2023-05	3.2 yrs

Plus 1 more approved within the last two years.

Batteries

projects of 10 MW and above · planning database, July 2026 · what batteries do →

Site	Size	Status	While discharging
Great Oak Energy Hub	400 MW	approved, not built 2025	could supply ≈1,402,000 homes
Bolney - Battery Storage	200 MW	approved, not built 2024	could supply ≈701,000 homes
Kent Street, Cowfold - Battery Energy Storage System	57 MW	refused 2024	could supply ≈200,000 homes

What this page does not show

Smaller wind farms on the local grid are also switched off; national data does not show it, so the £ figure here is a floor, not a zero. Offshore wind is counted nationally, never per seat. The planning database can run a quarter behind reality.

Electricity does not travel from a particular project to particular houses. Everything generated goes into the national grid and everyone draws from that shared pool, so "enough for X homes" is a way of sizing the electricity — not a claim that these homes would be powered by this site. Battery storage is counted separately from generation: it moves power in time rather than making it.

Planning statuses come from the government's planning database (REPD), which records what was decided and when, but not why. Where a project was refused we say so and name the authority; for the reasons, look up the planning reference on that council's own register. How to check any figure on this page →

Read the full method, including everything we cannot see →

What has John Milne said about the grid in Parliament? Search Hansard →

See the full league table Data (JSON)