About NO1-East Dam

The NO1 East electricity zone covers Eastern Norway, including Oslo, Akershus, Hedmark, Oppland, and the surrounding counties that drain into the Glomma and Drammen river systems. This zone is the most populous region of Norway and accounts for a significant share of national electricity consumption. The hydropower reservoirs here are fed primarily by snowmelt from the Jotunheimen and Rondane mountain ranges, with the melt season running from April through June providing the largest annual inflows. The Glomma, Norway's longest river, originates in the mountains of Innlandet and flows southward through a series of regulated lakes and power stations before reaching the Oslofjord. Key reservoirs in the zone include Mjøsa, Norway's largest lake, which provides both drinking water for several hundred thousand people and a substantial contribution to hydropower generation. The NO1 zone has a total hydropower storage capacity of approximately 11.2 TWh and is closely integrated with transmission links to Sweden, making it the most commercially active electricity trading zone in Norway. Reservoir levels in NO1 follow a predictable seasonal pattern: lowest in late winter before snowmelt begins, peaking in midsummer, and drawn down steadily through the autumn and winter heating season. The zone is operated by a combination of Statkraft, Eidsiva Energi, and other regional utilities.