Cardiff South and Penarth
Cardiff South and Penarth has 25 MW of clean power (all solar) approved and still not built: enough to supply a year's electricity to 9,000 homes. Britain's grid bottlenecks still add to bills here: about £92 a year per household, £3.9m across the constituency's 42,951 homes. A 50 MW battery was refused planning here in 2025; while discharging it could have supplied about 175,000 homes.
here
The waiting list
Every approved, unbuilt project
| Site | Technology | Enough for | Capacity | Approved | Waiting |
|---|---|---|---|---|---|
| Brynwell Farm | Solar Photovoltaics | 7,600 homes | 21.0 MW | 2022-11 | 3.7 yrs |
| Momentive Speciality Chemicals, Sully Moors Road - Solar Panels | Solar Photovoltaics | 500 homes | 1.3 MW | 2023-07 | 3.0 yrs |
| University Hospital, Penlan Road - Solar Arrays | Solar Photovoltaics | 300 homes | 0.7 MW | 2022-10 | 3.8 yrs |
| Llandough Hospital, Llandough - Solar Panels | Solar Photovoltaics | 300 homes | 0.7 MW | 2024-02 | 2.5 yrs |
| The Maltings East, Tyndall Street - Solar Panels | Solar Photovoltaics | 200 homes | 0.6 MW | 2023-11 | 2.7 yrs |
| Portmanmoor Road Industrial Estate, Portmanmoor Road - Solar Panels | Solar Photovoltaics | 100 homes | 0.4 MW | 2023-06 | 3.1 yrs |
| Techniquest, Stuart Street - Solar Panels | Solar Photovoltaics | 100 homes | 0.2 MW | 2023-07 | 3.0 yrs |
Plus 2 more approved within the last two years.
Batteries
| Site | Size | Status | While discharging |
|---|---|---|---|
| Rover Way, Splott - Energy Park & Data Centre | 1,000 MW | approved, not built 2025 | could supply ≈3,504,000 homes |
| Pen Y Maes, Ashby Road - Battery Energy Storage | 50 MW | refused 2025 | could supply ≈175,000 homes |
| Sully Moors Road - Battery Energy Storage Facility | 50 MW | approved, not built 2026 | 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 →
What has Stephen Doughty said about the grid in Parliament? Search Hansard →