Spondon wind turbines to begin working in new year
Two large wind turbines, which have not been used because of interference problems with an airport's radar, will be fully working in January.
The 130m (426 ft) high turbines, at a sewage treatment plant in Spondon, Derby, were installed in December 2013.
They have stood idle since then because of issues with a radar at East Midlands Airport six miles (10km) away.
Severn Trent Water said new technology had now been tested and was proving successful.
The turbines have planning permission to be installed for 25 years. When operational they are expected to produce about 10,000 MWh annually and power up to 6,000 homes in Derby.