A Montana company has been granted a license to build a $1 billion, 400-megawatt power storage project in the central part of the state that would supplement electricity from wind turbines and other sources, according to documents released Thursday by federal regulators. The 50-year license from the Federal Energy Regulatory Commission allows Absaroka Energy, of Bozeman, Montana, to construct and operate the project on a 177-acre site near the tiny town of Martinsdale, home to fewer than 100 people.