CONSTITUENCY BRIEFING · ENERGYMAP.APP
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.
Ranks 183 of 650 for clean power approved and not built.
What is stuck, and why
| Project and developer | Tech | Size | Why it is stuck |
|---|---|---|---|
| Rover Way, Splott - Energy Park & Data CentreLatos Cardiff Limited | Battery | 1,000 MW |
Approved a year ago — nothing has happened sinceWho can move it: the developer and the network company |
| Pen Y Maes, Ashby Road - Battery Energy StorageRoot Power South Limited | Battery | 50 MW |
Refused by Vale of Glamorgan Council in 2025Who can move it: Vale of Glamorgan Council |
| Sully Moors Road - Battery Energy Storage FacilityCentrica Plc Head Office | Battery | 50 MW |
Approved less than a year ago — nothing has happened sinceWho can move it: the developer and the network company |
What else is in the briefing
- All 5 projects, each with its planning reference and the organisation that holds the next decision
- Every approval a project still needs, and which of them the public can see
- What building them would mean here — community payments, business rates and construction work
- How Cardiff South and Penarth compares with its neighbouring constituencies
- Drafted parliamentary questions and letters, filled in with this seat's figures
- 3 story angles for local reporting
- A two-page PDF, and a newsroom edition with the references and who to call
No account needed for any of this:
the full seat page with every figure,
the method and sources,
and this constituency's raw data.
The account covers the packaged briefing only.