Associated Press: The Obama administration has approved what would be the nation’s first offshore wind farm, off Cape Cod, inching the U.S. closer to harvesting an untapped domestic energy source – the steady breezes blowing along its vast coasts. U.S. Interior Secretary Ken Salazar announced his decision Wednesday in Boston, clearing the way for a 130-turbine wind farm in Nantucket Sound. Cape Wind was in its ninth year of federal review, and Salazar stepped in early this year to bring what he called …