No.48 of 650 · approved, not built MP: Kanishka Narayan (Labour) Wales

Vale of Glamorgan

Vale of Glamorgan has 123 MW of clean power (all solar) approved and still not built: enough to supply a year's electricity to 45,000 homes. Britain's grid bottlenecks still add to bills here: about £92 a year per household, £3.8m across the constituency's 41,054 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

123 MW

of clean power — all solar — approved and still not built, enough to supply a year's electricity to 45,000 homes — about as many homes as this constituency has. Approved at least two years ago; waiting on the grid, not on planning. That is 1.6× the renewable capacity actually running here.

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

£3.8m

is what the grid gap costs this constituency's 41,054 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

5 of 5 waiting projects · years since approval

Aerospace Business Park 1.5 MW

6.4 YRS

Wm Morrison Supermarkets, Heol Ceiniog - Solar Panels 0.2 MW

3.6 YRS

Aston Martin Lagonda, Llanmaes - Solar Pv Panels 6 MW

2.5 YRS

Vianshill Farm, Parc Dyffryn - Solar Farm & Battery Storage 65 MW

2.2 YRS

Pancross & Oaklands Solar Farm 50 MW

2.2 YRS

Every approved, unbuilt project

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

Site	Technology	Enough for	Capacity	Approved	Waiting
Vianshill Farm, Parc Dyffryn - Solar Farm & Battery Storage	Solar Photovoltaics	24,000 homes	65.0 MW	2024-05	2.2 yrs
Pancross & Oaklands Solar Farm	Solar Photovoltaics	18,000 homes	50.0 MW	2024-05	2.2 yrs
Aston Martin Lagonda, Llanmaes - Solar Pv Panels	Solar Photovoltaics	2,200 homes	6.0 MW	2024-02	2.5 yrs
Aerospace Business Park	Solar Photovoltaics	500 homes	1.5 MW	2020-03	6.4 yrs
Wm Morrison Supermarkets, Heol Ceiniog - Solar Panels	Solar Photovoltaics	100 homes	0.2 MW	2023-01	3.6 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
Castle Road, Burton - Battery Energy Storage System	440 MW	in planning	could supply ≈1,542,000 homes
Aberthaw Battery Energy Storage System	249 MW	in planning	could supply ≈872,000 homes
Pancross & Oaklands Solar Farm	50 MW	being built 2024	could supply ≈175,000 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 Kanishka Narayan said about the grid in Parliament? Search Hansard →

See the full league table Data (JSON)