Substation · England, United Kingdom
Holywell Grid 33kV Substation
Holywell Grid 33kV Substation is a 33 kV primary substation in England, United Kingdom, with 20.6 MVA of demand headroom and 58.5 MVA of generation headroom, operated by Eastern Power Networks plc (UK Power Networks, East England licence area).
Facts
Every value links to its source, and to the source's own record where it has one. Licences and last-checked dates are per row.
| Fact | Value | Source |
|---|---|---|
| Location | England | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
| Grid operator | Eastern Power Networks plc (UK Power Networks, East England licence area) | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
| Demand headroom | 20.6 MVA | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
| Generation headroom | 58.5 MVA | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
| Firm capacity | 78 MVA | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
| Level | Primary substation | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
| Voltage | 33 kV | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
| Coordinates | 51.6467, -0.4077 | UK Power Networks open data portal · CC BY 4.0 · checked 25 Oct 2026 |
Research on this substation and the land around it.Its headroom, connection queue and congestion, who owns the land around it, and an introduction to those owners.
Nearby
Within 50 km of this substation: 384 power plants (137 operating, 2,743 MW), 356 grid connections (244 operating, 2,282 MW), 153 data centers (1 operating, 88 MW), 1 transmission line and 1 AI supercomputer, measured from the coordinates in the facts above. The table shows the nearest 9, up to 3 per kind.
| Name | Kind | Size | Status | Distance |
|---|---|---|---|---|
| The Chess Building | Data center | — | — | 1.4 km |
| Mirror Colour Print Ltd grid connection | Grid connection | 7.2 MW | Operating | 4.0 km |
| David Lloyd Leisure, Ducks Hill Road - Solar Panels | Power plant | 1 MW | Cancelled | 4.3 km |
| Elstree Substation, Hilfield Lane - Battery Energy Storage | Power plant | 400 MW | Cancelled | 5.0 km |
| Hilfield Lane, Aldenham - Battery Energy Storage | Power plant | 170 MW | Permitted | 5.1 km |
| Bio Products Laboratory grid connection | Grid connection | 2 MW | Operating | 6.2 km |
| (ANM) A41 Kings Langley grid connection | Grid connection | 25 MW | Planned | 7.2 km |
| Kao Data KLON-05 | Data center | — | — | 12 km |
| NTT Hemel Hempstead 4 | Data center | — | — | 12 km |
Grid operator and place
More from Eastern Power Networks plc
- Canvey Primary 11kVsubstation
- Thorley Primary 11kVsubstation
- Peterborough South Grid 11kVsubstation
- Westbury Primary 11kVsubstation
- Laxfield Primary 11kVsubstation
- Fulbourn Grid 33kVsubstation
- Earlham Grid 33kVsubstation
- Hunstanton Primary 11kVsubstation
Candidate sites around this substation
6 sites of land near Holywell Grid 33kV have it as nearest substation. Each site page gives its area, its distance to the substation and its site score; owners are on request.
- 18 ha brownfield site at Land at Riverwell and Watford General Hospital0.56 km · score 46
- 1.5 ha brownfield site at Wiggenhall Depot, Watford0.95 km · score 36
- 3.2 ha brownfield site at Land at Croxley View, Watford1.13 km · score 34
- 3.6 ha brownfield site at Ascot Road, Eagle Relocations, Watford1.18 km · score 33
- 3 ha brownfield site at Metropolitan Line Station area Cassiobury Park Avenue, Watford1.37 km · score 30
- 1.45 ha brownfield site at Croxley Station Car Park and Timber Yard, Croxley Green, Three Rivers2.24 km · score 21
Other substations in England
Data on this page
- Contains public sector information licensed under the Open Government Licence v3.0. DESNZ Renewable Energy Planning Database (REPD), Open Government Licence v3.0.
- © OpenStreetMap contributors. OpenStreetMap data centers, ODbL 1.0.
- UK Power Networks. UK Power Networks open data portal, CC BY 4.0.