As part of its relicensing of three dams on the Skagit River, Seattle City Light is paying $1.35 billion to three tribes, which will raise electricity rates but help the river and reservations.By Blaine HardenNEWHALEM, Wash.—More than a century ago, Seattle City Light broke ground for a massive hydroelectric project here in a remote gorge of the North Cascades. Three dams soon powered the rise of what would become one of America’s richest and most liberal cities.