Cia Aig
Cia Aig is a 3 MW small hydro scheme in Scotland, operated by RWE Npower. The UK government lists it as operational in its register of power stations (DUKES table 5.11, May 2025).
- Small Hydro
- Scotland
Key facts
- Installed capacity
- 3 MW
- Status
- Operational
- Technology
- Hydro Β· Small Hydro
- Operator
- RWE Npower
- Region
- Scotland
- Country
- Scotland
- Grid connection (DUKES)
- LV
- Combined heat & power
- No
- Coordinates
- 56.9537, -5.0076
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 Cia Aig compares
At a typical UK load factor for this technology (about 35% of the maximum possible output), a 3 MW station would generate roughly 9.2 GWh of electricity in a year, similar to the annual use of about 3,410 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 Scotland All run by RWE NpowerNearby generating sites
- Mucomir Power Station Β· 1.9 MW small hydro scheme5.0 km
- Garry Gualach Β· 0.78 MW small hydro scheme11.1 km
- Quoich Power Station - A, E, G Β· 18.1 MW hydroelectric station12.1 km
- Quoich Dam - A Β· 0.32 MW small hydro scheme12.1 km
- Derrydarroch Β· 2 MW small hydro scheme14.2 km
- Beinneun Wind Farm Β· 109 MW onshore wind farm16.0 km
- Invergarry Power Station - A,E Β· 20 MW hydroelectric station19.3 km
- Cluanie Dam - A Β· 0.32 MW small hydro scheme21.1 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
Planning history
From the government's Renewable Energy Planning Database (REPD), matched to this site by location, capacity and name.
- Planning status
- Operational
- Site name in planning record
- Cia Aig Hydro
- Developer / operator
- RWE Npower Renewables
- Planning authority
- Scottish Government (S36)
- Planning reference
- EC00003156
- Application submitted
- 4 September 2009
- Permission granted
- 26 June 2010
- Construction started
- 7 December 2012
- Began operating
- 24 August 2016
- Capacity in planning record
- 3 MW
- Address
- Achnacarry,, Highland
- REPD reference
- 475
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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