The River Wharfe in West Yorkshire has started to generate electricity for about 300 homes following the opening of a hydropower station.
The Greenholme Mill station in Burley, Wharfdale, was opened by MP Philip Davies on Saturday.
The station cost £700,000 and over a year will produce 14,000 megawatt hours of electricity, investor CO2Sense said.
CO2Sense, a subsidiary of Yorkshire Forward, invested £200,000 and provided technical support.
Energy generated by the turbine will be sold to the National Grid.
