Power supply

and

, the renewable energy division of the

, have signed an agreement worth around €2bn (£1.76bn) for the supply of 250 REpower 5M/6M offshore wind turbines.

The turbines will be deployed in the UK, the Netherlands and at the Innogy Nordsee 1 wind farm.

The first 30 offshore wind energy units of the REpower 5M model are scheduled to be delivered in 2011, with delivery volumes increasing through 2012 to 2015.

The units will mainly be used in the planned Innogy Nordsee 1 wind farm, which will be built 40km north of the East Frisian island of Juist, Germany.

Kevin McCullough, chief operating officer of RWE Innogy, said: 'Innogy Nordsee 1 is an extremely exciting project. We are planning to construct between 150 and 180 wind turbines of the five and six megawatt class at water depths of 26m to 34m. With an installed capacity of around 1,000MW, the wind farm will statistically be able to supply electricity to around 780,000 households.'

With a nominal output of five and six megawatts and a rotor diameter of 126m, the 5M and 6M are said to be among the largest and most powerful wind energy systems in the world.