A tidal power project is delivering electricity to the U.S. power grid for the first time, energy officials said Thursday. Ocean Renewable Power Co.'s first underwater turbine, off eastern Maine, was delivering to the grid the first commercially produced tidal power on Thursday afternoon, said Bangor Hydro Electric Co., which operates the grid where the tidal power connects. "This historic moment elevates the U.S. to the world stage," said Chris Sauer, president and CEO of Portland-based Ocean Renewable Power, which has invested $15 million in the project. The amount of power is modest for now. The first underwater turbine generator...