The first turbines at one of Britain's biggest offshore wind farms have begun to produce power.
The rest of the wind farm should be operational by the end of summer
Two of the 30 turbines at Scroby Sands off the coast of Norfolk near Great Yarmouth began rotating on Monday.
The switch-on of the 60ft turbines was the culmination of 10 years of planning and coincided with the opening of the wind farm's new information centre.
The remaining turbines should go into operation during August, supplying enough power for about 41,000 homes.
Jason Scagell, head of E.ON UK Renewables, the firm which runs Powergen, said it was a fantastic day for the people involved with the £75m project.
"We've been involved with the project for almost a decade and to finally have the first turbine turning is just a great sight," he said.
"I hope that local people and tourists will have the chance to have a look at the wind farm as we gradually bring all 30 turbines on line over the next few weeks."
The turbines will save the emission of 75,000 tons of carbon dioxide each year and Powergen also has the option of adding another eight turbines if the first wave prove successful.