Kraftwerke Oberhasli AG (KWO) is a Swiss energy supply company, based in Innertkirchen (BE) and operating several hydroelectric plants in the Oberhasli area of the Canton of Bern . 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.

Founded in 1925, the company had its first power plant, Handeck 1, online by 1932. Currently, KWO is operating nine plants, fed by the reservoirs of Grimselsee , Oberaarsee , Räterichsbodensee , Gelmersee and Totensee, with a total of 26 turbines giving a total maximum power output of 1.125 Gigawatts.