Hammerstrand power plant has three dams:
Nydammen: Built circa 1918. The dam has a height of 13 metres and a length of 116 metres. Nydammen holds about 550,000 m3 of water.
Sætervannet: Built in the early 1900s. The dam has a height of about 7 metres and a length of about 38 metres. Sætervannet holds about 550,000 m3 of water.
Djupsjøen: Built in the early 1900s. The dam has a height of 10 metres and a length of about 60 metres. Djupsjøen holds about 2,200,000 m3 of water, in addition to the occasional trout.
In the summer of 2012, major improvements were under way for all the dams connected to the Hammerstrand power plant.
The penstock was built in 1928, and originally had riveted steel pipes. Today, it consists of fibreglass, PVC and steel. The pipe diameter is 60 cm. The penstock is 2.2 km long with a fall height of 176 metres. This results in a water pressure of about 17.6 kg down at the power station.
At full production, the Hammerstrand power plant uses 0.6 m3 water per second. The plant needs 3.3 m3 water to produce 1kWh.