A Derby environmentalist who lives next to the city's wind turbines is "angry and frustrated" that they are not turning.
Peter Ambler said he welcomed the two structures being built in Spondon when they were installed by Severn Trent in December 2013. But he said he was unhappy at having to look at the turbines not working, nearly three years after they went up.
The turbines, in Megaloughton Lane, have not operated regularly because they show up on air traffic control equipment at East Midlands Airport, Castle Donington.
The turbines are expected to produce 10,000 megawatts of electricity a year – the equivalent of supplying about 3,000 homes with power.
Mr Ambler said: "I was really keen on them. A renewable energy expert came to my home and told me what was planned and I thought it was great. I'm a massive fan of renewable energy. The turbines would come with no fumes and would not pollute the atmosphere.
"It was going to be green energy and great for the environment. A lot of people were unhappy and said it would create a lot of noise but I was all for it.
"As they started to build them I thought it was great. It took them no time at all, they were installed within a few days. I was really positive and didn't think it was going to be long until they were operational."
However, despite some testing, they have never been fully operational.
Mr Ambler said it was "totally crazy" when there were turbines at East Midlands Airport. He said: "I cannot understand it. I have been praying for them to start to work. It's frustrating and it makes me angry. I have to look at them doing nothing all day long.
"I would love to look out of my garden and see them both working. They are only a few metres from me."
A spokesman for Severn Trent said: "We’re obviously as keen as the gentleman to see them turning but we continue to work with the airport and will update everyone as soon as our discussions are complete."
His comments come as Severn Trent has applied to build an energy plant on the same site to convert almost 1,000 tonnes of food waste a week into gas. It would digest waste food to produce methane, which would then be treated and injected into the gas grid for use in homes and businesses. There would be an estimated 54 HGV movements in and out of the site each day.
Spondon city councillor Chris Poulter said Severn Trent were "not doing their reputation any good" because of the delays.
He said: "I share Peter's frustrations and concerns and I think Severn Trent want to see them working as much as anybody.
Last month, Mid Derbyshire MP Pauline Latham said the turbines should be pulled down and sold for scrap metal. The Tory politician said she was angry at the lack of progress and was concerned it would impact on customers.