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Output over the last 7 days
About Ffestiniog
Ffestiniog is a pumped storage hydro station near Blaenau Ffestiniog in Gwynedd. It was commissioned in 1963. It pumps water uphill to its top reservoir when power is plentiful, and lets it back down through turbines when the grid needs it.
Its 365 MW of registered generating capacity is spread across 4 balancing mechanism units. Every half hour each unit tells the grid how much it will generate (its physical notification): that is the live figure above, and GridMonkey records it every half hour for the chart.
Pumped storage stations are giant water batteries: they pump water uphill when power is plentiful and generate when the grid needs it, within a minute or two.
| Type | Pumped storage hydro |
|---|---|
| Registered capacity | 365 MW |
| Commissioned | 1963 (DUKES 5.11) |
| Area | Gwynedd |
| Location | Near Blaenau Ffestiniog in Gwynedd 52.981° N, 3.969° W |
| Owner | Engie (DUKES 5.11) |
| Elexon lead party | First Hydro Company |
| BM units | T_FFES-1 91 MW, T_FFES-2 92 MW, T_FFES-3 91 MW, T_FFES-4 91 MW |
| Size | 3rd largest of the 4 pumped storage stations on GridMonkey's list |
Other pumped storage stations
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Contains BMRS data © Elexon Limited copyright and database right 2026 (licence). Station names and areas come from GridMonkey's own table, matched to the units in Elexon's register; a station's output here is its physical notification, not metered generation. Owner, year commissioned and location: Power stations in the United Kingdom (DUKES 5.11) (Department for Energy Security and Net Zero, May 2026). Contains public sector information licensed under the Open Government Licence v3.0.