Land at Pen Onn Solar Farm (45 MW)
Land at Pen Onn Solar Farm is a 45 MW solar farm project in Vale of Glamorgan, Wales. Its status in the Renewable Energy Planning Database (July 2026 extract) is: approved on 29 May 2025, not yet built; the record was last updated on 20 February 2026. It is decided by the Welsh Government as a development of national significance.
Planning timeline
| Date | Stage |
|---|---|
| 20 December 2023 | Application submitted |
| 29 May 2025 | Planning permission granted |
| 29 May 2030 | Permission due to expire (unless work starts) |
Project details
- Technology
- solar farm
- Capacity
- 45 MW
- Status (REPD)
- approved, not built
- Record last updated
- 20 February 2026
- Operator or applicant
- Iolo Energy
- Planning authority
- Welsh Government (NSIP)
- Planning application reference
- DNS/3273713
- Site area
- 63.5 ha
- Address (REPD)
- Land at Pen Onn, Llancarfan, Barry
- Council area (by location)
- Vale of Glamorgan
- Time to decision
- 75 weeks
- Contracts for Difference
- AR7a
- Name in REPD
- Land at Pen Onn - Solar Farm
- REPD reference
- 10908
The scheme also includes battery storage, recorded separately in REPD (approved, not built).
Who decides
It is decided by the Welsh Government as a development of national significance. Welsh Government (NSIP) refused 22% of 55 decided solar, wind and battery applications in REPD (median 67 weeks to a decision). Across all UK planning authorities 19% of 10,236 decided applications were refused.
Other large projects within 10 km
| Project | Type | MW | Status | km |
|---|---|---|---|---|
| Llancadle Farm | solar farm | 5 | operational | 2.1 |
| East Aberthaw Solar farm | solar farm | 35 | approved, not built | 2.4 |
| Sutton Mawr Farm | solar farm | 7.5 | operational | 2.5 |
| Sutton Mawr Solar Farm (extension) | solar farm | 8 | abandoned | 2.6 |
| Cwm Derwyn Farm | solar farm | 5 | operational | 3.4 |
| Whitton Mawr | solar farm | 6 | operational | 3.7 |
| Pancross & Oaklands Solar Farm | solar farm | 50 | under construction | 3.7 |
| Weycock Road | solar farm | 7 | operational | 3.9 |
| West Hall Solar Farm | solar farm | 7 | operational | 4.0 |
Status and dates as recorded in the Renewable Energy Planning Database (July 2026 extract); the database is compiled from public sources and can lag behind council decisions. Location: REPD grid reference (51.4195, -3.3637).