An uncontrolled renewable power expansion in Germany could threaten the stability of energy grids, the head of energy agency Dena told Reuters on Wednesday.

Failure to connect new capacity near demand centers or near transport grids or storage facilities would waste assets or put at risk the grids' stability, said Dena's director, Stephan Kohler, in an interview on the sidelines of a sector con

Germany on Monday launched its first commercial-size wind power park in the Baltic Sea, adding to some small existing capacity in the North Sea, operator EnBW said.

The 48.3 megawatt unit called Baltic 1, which is some 16 kilometers north of the Darss/Zingst peninsula, has started feeding power into the national grid, the utility said.

Baltic 1, which took three years to build and can supply