No.231 of 650 · approved, not built MP: Henry Tufnell (Labour) Wales

Mid and South Pembrokeshire

Mid and South Pembrokeshire has 9.5 MW of clean power (all solar) approved and still not built: enough to supply a year's electricity to 3,400 homes. When the wires are too full to carry the power, Britain pays wind farms to switch off instead. No wind farm here is paid that way — almost all of it goes to wind farms in Scotland. That cost is shared across every bill in Britain, so households here pay for it too: about £92 a year per household, £4.2m across the constituency's 45,486 homes.

Not visible
here

16 MW of wind is running in this constituency, but it sits on the local network rather than the national grid — so if it is paid to switch off, no national record shows it. That is why this seat has no figure here: not because nothing happens, but because nobody publishes it. The £ figure for this seat is a floor, not a zero.

how we worked this out

9.5 MW

of clean power — all solar — approved and still not built, enough to supply a year's electricity to 3,400 homes. Approved at least two years ago; waiting on the grid, not on planning.

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

£4.2m

is what the grid gap costs this constituency's 45,486 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

3 of 3 waiting projects · years since approval

Heatherton World Of Activity, Heatherton Sports Park - Solar Arrays 0.2 MW

3.3 YRS

Kiln Park Holiday Centre, Marsh Road - Solar Photovoltaic Panels 0.2 MW

2.7 YRS

West Farm, Cosheston - Solar Farm 9 MW

2.4 YRS

Every approved, unbuilt project

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

Site	Technology	Enough for	Capacity	Approved	Waiting
West Farm, Cosheston - Solar Farm	Solar Photovoltaics	3,300 homes	9.0 MW	2024-03	2.4 yrs
Heatherton World Of Activity, Heatherton Sports Park - Solar Arrays	Solar Photovoltaics	100 homes	0.2 MW	2023-03	3.3 yrs
Kiln Park Holiday Centre, Marsh Road - Solar Photovoltaic Panels	Solar Photovoltaics	100 homes	0.2 MW	2023-11	2.7 yrs

Plus 4 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
Pembroke Power Station, Pwllcrochan - Battery Storage	350 MW	approved, not built 2025	could supply ≈1,226,000 homes
Goldborough Road, Hundleton - Battery Energy Storage	350 MW	approved, not built 2025	could supply ≈1,226,000 homes
The Greenlink Converter Station - Lambeeth Battery Energy Storage	50 MW	approved, not built 2024	could supply ≈175,000 homes
White House Farm	12 MW	in planning	could supply ≈42,000 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 Henry Tufnell said about the grid in Parliament? Search Hansard →

See the full league table Data (JSON)