Tonstad Power Station () is a hydroelectric power station located in Sirdal Municipality in Agder county, Norway. The station is in Tonstad, at the northern end of the lake Sirdalsvatnet.
It has a total installed capacity of , with 4 units each producing and one unit at , all equipped with francis turbines. With an annual production of approximately , it is the largest power station in Norway with respect to annual production (in 2006). It is near the landing point of the NORD.LINK power cable to Germany.
The powerstation utilises the waterfalls in the Sira and the Kvina river system, with a total height of . An application for an expansion with an additional (pumped storage) was sent in 2008. The application is still pending.
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