Vamma is located on the Glomma river, 18 km below Lake Øyeren. Before the development, lots of water was lost through the highwater overflow. With the new power station, which is coordinated with the old units, the water is utilised more efficiently and much less water is lost. Vamma 12 is the twelfth unit in Vamma Power Plant, built as standalone power station with intakes in the same reservoir. The power plant has a total throughput of 500 cubic metres per second and an installed capacity of 127 MW.
Norconsult was responsible for the BIM model and the construction work was solely based on the digital model. Vamma 12 is a ground-breaking BIM project. Already in 2015, the contractor established that no detailed drawings would be prepared, only digital models. Norconsult played a leading role in the BIM, and established a good collaboration with the contractor, construction management and even major software suppliers who adapted their products in order for the project to use BIM successfully.
No watercourse encroachments were made during the construction, and the power station now generates a high volume of renewable power. Rocks from the tunnel construction were disposed of in the immediate vicinity, meaning that the project generated minimal works traffic. Vamma Power Plant’s 1.6 TWh annual output accounts for more than one per cent of Norway’s total electricity consumption. The turbine’s runner at Vamma is approximately eight metres in diameter and has an output capacity of 127 MW, equivalent to 170,000 horsepower. More than 250,000 cubic meters of rock was blasted out, and over 35,000 cubic meters of concrete was poured. Vamma 12 is taller than Oslo City Hall.