Hanefoss power station is a hydroelectric facility on the Uldal river system at Herefoss in Birkenes Municipality in Aust-Agder.
Hanefoss power station is situated in Birkenes Municipality in Aust-Agder. The municipality has a population of 4 993, and covers an area of 674 km², approximately 6% of which is water.
The power station lies on the Uldal river system, at Lake Uldalsåna.
http://webby.nve.no/publikasjoner/rapport/2013/rapport2013_52.pdf, Wikipedia, Agder Energi’s own data.