[1] The smelting of the mineral bauxite to make aluminium is an energy intensive process requiring a large amount of electricity.

[3] The Aluminium Corporation of Dolgarrog acquired a controlling interest in the North Wales Power and Traction Company in 1918.

The Electricity Commissioners gave consent to the addition of a new 6.5 MW generating set.

The North Wales and South Cheshire Joint Electricity Authority (JEA) supported the North Wales Power Bill which increased the share capital of the Power Company to £3 million.

[7] At that time the net capability of Dolgarrog power station was 27 MW from four machines.

Ownership was vested in National Power in 1990 which demerged as Innogy plc in 2000.

[3] Commissioned in 1909, comprising a Boving Pelton wheel with Bruce Peebles 1.2 MW, 6.6 kV alternator.

[3] Commissioned in 1924–25 and comprising 2 Pelton wheels driving 2 × 5 MW AC alternators.

[3] Commissioned in 1957, comprising one Boving-Bruce Peebles 10 MW set operating at 750 rpm and with a working head of 750 feet (229 m).

The output in GWh is shown graphically.The station is currently (2020) operated by Innogy Renewables UK.