Demand for power is surging in central Washington's Grant County, where computer server farms owned by Microsoft, Yahoo and several other business giants hum 24 hours a day. "We've got five server farms and more coming," said Tim Culbertson, general manager of the Ephrata-based Grant County Public Utility District. The public power utility uses hydroelectric power from such facilities as the nearby Wanapum and Priest Rapids dams on the...