The main plant at Hovatn was commissioned in 1971. In 1996 the upper part of the Heis river system was diverted to the Hovatn reservoir.
Hovatn power station is situated in Bygland Municipality in Aust-Agder. The municipality has a population of 1 200, and covers an area of 1 312 km², approximately 12% of which is water. Hovatn is one of three power stations in the municipality.
The power station makes use of the 485-metre drop from the reservoir at Hovatn to the River Otra.
It is dug 340 metres into the mountains on the east side of the Otra, approximately four kilometres north of Ose. The power station, which is located at Heistad, is remotely controlled from the Brokke control centre.
Wikipedia, Agder Energi’s own data.