Longerak power station | Agder Energi

Longerak power station

The power station was built by the central government in 1915, and started supplying the Landeskogen sanatorium with electricity the following year.

Key numbers


Longerak 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. Longerak is one of three power stations in the municipality.

The power station lies half way up the valley side on the east side of Lake Byglandsfjorden.

The power station makes use of the 300-metre drop from the Langeraksvatn reservoir, which is dammed to an elevation of between 598 and 594 m above sea level.

Tunnel length 1195m
Vertical drop 300m
Operating since 1916
Aggregates Aggregates Aggregates
Number Aggregates in operation at the station:3
Agder Engergi owns 100% of power plant
Every second runs the 0m³ water through the plant. Enough to fill 0 ten-liter buckets of water every hundredth of a second.

Power producting:

Longerak power station supplies 7 GWh to Agder Energi per year, equivalent to 0.09% of the 8200 GWh generated by the group in an average year.
This makes Longerak power station the 40th biggest power station in the Agder Energi group.
1000 husstander
Agder Energi’s share of generation covers the annual consumption of approximately 350 households.

Wikipedia, Agder Energi’s own data.