Ulla-Førre is a hydropower complex in Southern Norway. It is situated along the borders of the municipalities of Suldal and Hjelmeland (in Rogaland county) and Bykle (in Agder county), Norway. It has an installed capacity of approximately 2,100 megawatts (2,800,000 hp), and the annual average production is 4.45 TWh (16.0 PJ) (1987–2006), while its reservoir capacity is about 7.8 TWh (28 PJ); at full production, it can last seven to eight months.^[1] The complex includes the artificial lake Blåsjø, which is made by dams around 1,000 metres (3,300 ft) above the sea level. The hydroelectric power stations in the complex are Saurdal, Kvilldal, Hylen and Stølsdal, operated by Statkraft.^[2]

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Quick Facts Country, Status ...

Ulla-Førre
The artificial lake Blåsjø and Storvassdammen
Location of Ulla-Førre in Norway
Country	Norway
Status	Operational
Owner(s)	Statkraft
Reservoir
Creates	Blåsjø
Total capacity	3.1 km3 (0.74 cu mi)
Active capacity	7.8 TWh[1]
Surface area	84.48 km2 (32.62 sq mi)
Normal elevation	930–1,055 m (3,051–3,461 ft)
Kvilldal Hydroelectric Power Station
Installed capacity	1,240 MW
Annual generation	3,517 GWh
Saurdal Hydroelectric Power Station
Installed capacity	640 MW
Annual generation	1,335 GWh
Hylen Hydroelectric Power Station
Installed capacity	160 MW
Annual generation	583 GWh
Stølsdal Hydroelectric Power Station
Installed capacity	17 MW
Annual generation	51 GWh

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Blåsjø is the tenth largest lake in Norway by area. It is located in the municipality of Bykle in Agder county and the municipalities of Hjelmeland and Suldal in Rogaland county. The lake is about 20 kilometres (12 mi) west of the village of Bykle. It has a surface area of 84.48 square kilometres (32.62 sq mi). Its surface swings between 930 and 1,055 metres (3,051 and 3,461 ft) above sea level depending on seasonal weather and power consumption, and it has a shoreline of about 200 kilometres (120 mi).^[3] At the highest regulated water level, Blåsjø contains 3,105,000,000 cubic metres (4.061×10⁹ cu yd) of water.

The Kvilldal Power Station is a located in the municipality of Suldal. The facility operates at an installed capacity of 1,240 megawatts (1,660,000 hp), making it the largest power station in Norway in terms of capacity.^[4] Statnett plans to upgrade the western grid from 300 kV to 420 kV at a cost of 8 billion kr,^[5][6] partly to accommodate the North Sea Link cable^[7] from Kvilldal to Blyth, UK.^[8]

The Saurdal Power Station is a hydroelectric and pumped-storage power station located in the municipality of Suldal. The facility operates at an installed capacity of 674 megawatts (904,000 hp) (in 2015). The average energy absorbed by pumps per year is 1,189 GWh (4,280 TJ) (in 2009 to 2012). The average annual production is 1,335 GWh (4,810 TJ) (up to 2012).^[9]

The Hylen Power Station is located at the bottom of Hylsfjord in Suldal. It operates at an installed capacity of 160 megawatts (210,000 hp), with an average annual production of 583 GWh (2,100 TJ). The plant exploits water through a tunnel from the lake Suldalsvatnet.^[10]