Tarsartuup Tasersua is located midway between Nuuk and Maniitsoq in the north/south direction and about 120 km east of those towns. The potential’s most important water source is melted ice from a glacier at the lake’s eastern end. This means that the water is filled with silt particles from the glacier and environmental studies have shown that the lake has no fish. The reservoir consists of a main magazine (Tarsartuup Tasersua) and a smaller magazine to the south that a tunnel for a hydroelectric power plant can run from. The tunnel will be approximately 10 km long and flow into in a power plant blasted/drilled into the mountains at Anavik Bay in Godthaab Fjord.
Other construction works will include up to six dams, of which the highest is expected to be approximately 32 metres. There will be up to three canals, where the longest will be about 720 metres and up to three tunnels where the longest will be approximately 2 km.
The main reason why Tarsartuup Tasersua should be raised from its current level is the size of the reservoir: A larger and deeper lake ensures a continuous water supply to the tunnel in winter and the lake’s capacity will compensate for lower inflow of rain and melt water in cold and dry years. Tunnels and canals are used to direct water from a number of smaller lakes and upland to Tarsartuup Tasersua, and thus increase the potential’s size.
The maximum surface area of the reservoir will be approximately 95 km2 with a maximum variation in the water level of 20 metres.
Expected capacity for Tarsartuup Tasersua: 175-200 MW. Tarsartuup Tasersua is therefore much less than Tasersiaq, but nevertheless similar to Iceland’s second largest existing hydroelectric power plant, Hrauneyjafoss, and it is four times as large as Greenland’s current largest hydroelectric power plant, the Buksefjord plant.