Mill Hill National Grid Substation (49.9 MW battery storage)
Mill Hill National Grid Substation is a 49.9 MW battery storage project in Barnet, England. Its status in the Renewable Energy Planning Database (July 2026 extract) is: approved on 13 March 2023, not yet built; the record was last updated on 27 March 2023.
49.9 MWbattery storage
approved, not builtstatus in REPD
27 March 2023record last updated
Barnetcouncil area
Planning timeline
| Date | Stage |
|---|---|
| 16 September 2020 | Application submitted |
| 7 April 2022 | Refused by the planning authority |
| 8 August 2022 | Appeal lodged |
| 13 March 2023 | Planning permission granted |
| 13 March 2023 | Appeal allowed |
Project details
- Technology
- battery storage (stand-alone storage)
- Capacity
- 49.9 MW
- Status (REPD)
- approved, not built
- Record last updated
- 27 March 2023
- Operator or applicant
- Harbour Energy
- Planning authority
- Barnet
- Planning application reference
- 20/4241/FUL
- Appeal reference
- 22/00221/AREF
- Address (REPD)
- National Grid Mill Hill Substa, Partingdale Lane, Barnet,
- Council area (by location)
- Barnet
- Time to decision
- 130 weeks
- REPD reference
- 8009
Who decides
Barnet has 9 decided solar, wind or battery applications in REPD — too few for a refusal rate (we show one from 10 decisions). Across all UK planning authorities 19% of 10,236 decisions were refusals.
Other large projects within 10 km
| Project | Type | MW | Status | km |
|---|---|---|---|---|
| Wrotham Park | solar farm | 30 | application submitted | 8.7 |
| Land At Swanland Road | solar farm | 5 | operational | 8.8 |
| Hilfield Solar arrays & Battery storage | solar farm | 49.9 | application withdrawn | 9.8 |
| Hilfield Lane, Aldenham | battery storage | 170 | approved, not built | 9.8 |
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 (51.6176, -0.2114).