Kraftwerke Oberhasli AG (KWO) is a Swiss energy supply company, based in Innertkirchen and operating several hydroelectric plants in the Oberhasli area of the Canton of Berne. It also operates a number of tourist attractions in the same area, mostly with some relationship to its energy supply business. It uses the brands Grimselstrom and Grimselwelt, the latter specifically for its tourism ventures. Both brands are named after the Grimsel Pass that forms the upper end of its operating area.