E-CO Energi is a Norwegian power company and after Statkraft the second largest producer of electricity in Norway.

E-CO also holds partial ownership of Oppland Energi, Opplandskraft, Øvre Otta, Vinstra Kraftselskap, Embretsfosskraftverkene and Norsk Grønnkraft.

Partially owned plants are located throughout Southern Norway, with main focus on Oppland, Hedmark and Buskerud.

All in all E-CO owns, operates wholly and partially, more than 70 hydroelectric power plants, including the third largest in Norway, Aurland 1.

[1] Christiania Elektricitetesværk was founded in 1892, with Hammeren power plant in Maridalen in Oslo opening a few years later.