Construction of the Sigalda Hydroelectric Power Station began in 1973, and the station’s three 50-MW turbines went online in 1977-78. The Sigalda Station is linked into the national grid with 220 kV transmission lines to the Sultartangi, Hrauneyjafoss and Vatnsfell Stations, as well as a 132-kV line to southeast Iceland.

Technical data:
Client: The National Power Company (Landsvirkjun)
Installed capacity: 150 MW
Turbines: 3 Francis units, vertical axis.
Gross head: 74 m
Harnessed discharge: 230 m3/s
Annual energy production: 650 GWh
Sigalda Dam: Length: 925 m; crest 42 m
Water reservoir: Krokslon Reservoir; 498 m.a.s.l.; storage capacity of 140 million m3.
Pressure shafts: 3 sloped pressure shafts; ø4.3 m; length 216 m
Headrace canal: 1000 m
Tailrace canal: 550 m

Mannvit services:

• Feasibility studies
• Site investigation
• Assessment of harnessing choices
• Civil works design
• Structural and mechanical design 
• Preliminary and final design
• Cost estimates
• Tender documents and evaluation
• Contract documents
• Project planning