The White House said two areas being eyed for offshore wind could produce up to 4.6 gigawatts of renewable energy, ultimately powering as many as 1.6 million homes. The first, a 399-square-mile swath of ocean known as the Morro Bay 399 Area, lies off California’s central coast and could produce 3 gigawatts. The other, the Humboldt Call Area off Northern California, is being considered by the Interior Department as a future Wind Energy Area.