Spain 's Gamesa Corporacion Tecnologica SA (GAM.MC), the world's second-largest wind power turbine producer, doesn't anticipate a pickup in U.S. demand of turbines before next year, Chairman Jorge Calvet said Friday.

"I see the light at the end of the tunnel. The perception is changing, but I can't see a clear bounce this year," he said during a meeting with reporters.

The U.S. is the world's second largest wind power market after China , but demand there has been flat for the last two years due to the lack of a clear regulatory framework, a drop in electricity demand and low natural gas prices.

"We see there are more active talks in Washington now" on the renewable energy sector, Calvet added. "That's why I think we will have news over the summer, in any case before year end."

The Obama administration has vowed to push U.S. renewable energy output to 20% of the total, and it has been pushing Congress to get a new energy bill approved, with added incentives for the sector. The bill was already approved by the House of Representatives, but has been stuck for months in the Senate.

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