The main source of income for Sirdal is the Sira-Kvina Power Company which gets its power from the big Sira and Kvina rivers.
 The waterfalls on the river Sira are utilized in four power stations owned by Sira-Kvina power company.
The company also owns three power stations in the Kvina river system, hence the company's name.
Total annual production is 6,000 gigawatt-hours (22,000 TJ), total installation is 1,760 megawatts (2,360,000 hp).
 The largest power station, Tonstad Hydroelectric Power Station, was inaugurated in 1968, with two units, each producing 160 megawatts (210,000 hp).
The power station has now 4 units, each 160 MW, and one unit at 320 megawatts (430,000 hp), giving a total output of 960 megawatts (1,290,000 hp).
Total annual production in this station is approximately 4,000 gigawatt-hours (14,000 TJ), which makes Tonstad the largest power station in Norway in terms of production.
 Sira-Kvina power company applied in 2007 for concession to expand the power station with two new units (reversible turbines), each containing 480 megawatts (640,000 hp), and the concession is pending.

Tourism is also an important source of income for the Sirdal economy, taking advantage of the extensive mountains, mountainous plateaus, lakes, and great views.
There are multiple alpine resorts and hotels in the valley, as well as cottages and camping spots.
Winter activities include six ski resorts for winter enjoyment.
Downhill ski areas include Tjørhomfjellet, Bjørnestad Ski Centre, Ålsheia Ski Centre, Fidjeland Ski Centre, and Ådneram Ski lift.
Cross-country skiers can enjoy dozens of trails over spectacular terrain.
Summer activities include hiking, horseback riding, and river rafting.
The main source of income for Sirdal is the Sira-Kvina Power Company which gets its power from the big Sira and Kvina rivers.  The waterfalls on the river Sira are utilized in four power stations owned by Sira-Kvina power company. The company also owns three power stations in the Kvina river system, hence the company's name. Total annual production is 6,000 gigawatt-hours (22,000 TJ), total installation is 1,760 megawatts (2,360,000 hp).  The largest power station, Tonstad Hydroelectric Power Station, was inaugurated in 1968, with two units, each producing 160 megawatts (210,000 hp). The power station has now 4 units, each 160 MW, and one unit at 320 megawatts (430,000 hp), giving a total output of 960 megawatts (1,290,000 hp). Total annual production in this station is approximately 4,000 gigawatt-hours (14,000 TJ), which makes Tonstad the largest power station in Norway in terms of production.  Sira-Kvina power company applied in 2007 for concession to expand the power station with two new units (reversible turbines), each containing 480 megawatts (640,000 hp), and the concession is pending.
Tourism is also an important source of income for the Sirdal economy, taking advantage of the extensive mountains, mountainous plateaus, lakes, and great views. There are multiple alpine resorts and hotels in the valley, as well as cottages and camping spots. Winter activities include six ski resorts for winter enjoyment. Downhill ski areas include Tjørhomfjellet, Bjørnestad Ski Centre, Ålsheia Ski Centre, Fidjeland Ski Centre, and Ådneram Ski lift. Cross-country skiers can enjoy dozens of trails over spectacular terrain. Summer activities include hiking, horseback riding, and river rafting.
Sirdal