Czech power firm CEZ is to build what it says will be Europe's largest onshore wind farm, in a £1.1bn-euro (£598m) project.
The wind farm is set to have a generation capacity of 600 megawatts and will be located in Romania.
Construction of the wind farm will start in September and it is due to begin operating in 2009.
Investment in renewable energy is increasing as EU rules make production from fossil fuels more expensive.
The current largest onshore wind farm is located in Whitlee in Scotland.
"Investing into renewables is one of the strategic measures we are taking to respond to the adopted energy climactic package of the EU," said Cez chairman, Martin Roman.
Eastern Europe relies heavily on coal and nuclear energy but is trying to shift away from its dependence on such fuels.