Shares in Vestas, the world's largest wind turbine maker, jumped by a quarter after the company reported a strong order book and a return to profit.
The Danish company made a profit of 55 million euros ($US80 million) in the June quarter, compared with a loss of 143 million euros in the same period a year ago.
Revenue rose by 36% to 1.4 billion euros.
The BBC reports the company suffered heavy losses in the first quarter.
Vestas said it expected to deliver 50% more energy capacity this year compared with 2010. It currently delivers about 40% of the world's offshore turbines.
