Construction of the Sigalda Hydroelectric Power Station began in 1978, and included three 50-MW turbines.
The rock-fill dam is 925 m long, clad with asphalt, and 40 m tall at its highest point.
The water is carried 1 km through an intake canal from Krókslón Reservoir to the western edge of Sigalda Hill.
Three pressure shafts, 216 m long and 4.3 m in diameter, run to the powerhouse north of the old riverbed, in part buried inside the Sigalda hillside.
The harnessed head is 74 m. A 550 m tailrace canal leads from the powerhouse into the Hrauneyjafoss Reservoir.