Cwm Dyli
Cwm Dyli is a 9.9 MW hydroelectric station in Wales, operated by RWE Npower. The UK government lists it as operational in its register of power stations (DUKES table 5.11, May 2025).
- Large Hydro
- Wales
Key facts
- Installed capacity
- 9.9 MW
- Status
- Operational
- Technology
- Hydro Β· Large Hydro
- Operator
- RWE Npower
- Region
- Wales
- Country
- Wales
- Grid connection (DUKES)
- LV
- Combined heat & power
- No
- Postcode
- LL55 4NW
- Coordinates
- 53.1227, -4.1238
Location
Map position from the published coordinates. For small sites this can be an approximate point rather than the exact boundary. Map Β© OpenStreetMap contributors.
How Cwm Dyli compares
At a typical UK load factor for this technology (about 35% of the maximum possible output), a 9.9 MW station would generate roughly 30 GWh of electricity in a year, similar to the annual use of about 11,240 homes at 2,700 kWh each. This is an illustrative estimate, not the station's metered output: real generation varies with weather, availability and grid constraints.
Hydroelectric stations generate electricity from water flowing downhill through turbines, either from a reservoir behind a dam or from a river (run-of-river). Most UK hydro capacity is in Scotland and Wales.
All UK hydro schemes and pumped-storage stations Hydro schemes and pumped-storage stations in Wales All run by RWE NpowerNearby generating sites
- Dinorwig Power Station Β· 1,800 MW pumped-storage station1.5 km
- Parciau Β· 12.7 MW solar farm9.2 km
- Garnedd Β· 0.56 MW small hydro scheme13.8 km
- Croesor Β· 0.51 MW small hydro scheme16.1 km
- Ffestiniog Power Station Β· 360 MW pumped-storage station18.9 km
- High Head Β· 17 MW hydroelectric station20.2 km
- Low Head Β· 15 MW hydroelectric station20.2 km
- Anglesey Β· 14.9 MW solar farm20.4 km
Also operated by RWE Npower
RWE Npower operates 90 sites in the register. Largest first:
- Pembroke Β· gas-fired power station2,199 MW
- Didcot A Power Station Β· coal-fired power station2,000 MW
- Staythorpe Β· CCGT gas power station1,828 MW
- Didcot B Β· gas-fired power station1,450 MW
- Tilbury B Power Station Β· coal-fired power station1,050 MW
- Triton Knoll Β· offshore wind farm857 MW
- Little Barford Β· CCGT gas power station735 MW
- London Array Β· offshore wind farm630 MW
Source
Department for Energy Security and Net Zero (DESNZ), Digest of UK Energy Statistics (DUKES), table 5.11: power stations in the United Kingdom β operational at end of May 2025.
Capacity is installed capacity as published, not current output. Status reflects the source date, not live operation.
View the original source
Last checked by Octary: 15 July 2026
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