The run-of-river dam feeds an underground hydroelectric power station located approximately 5 kilometres (3.1 mi) away, via tunnel.

[3] The dam creates the Kukule Ganga Reservoir, which has a capacity and catchment area of 1,630,000 m3 (58,000,000 cu ft) and 312 km2 (120 sq mi) respectively.

After passing through the dam and sand traps, water from the reservoir is fed into a 5.71 km (3.55 mi) long tunnel, which leads to the underground power station.

This capacity was intentionally limited to 70 MW due to load issues.

[2] Two transformers step up the voltage of the power generated to 132 kV, which is then transferred to the national grid at the Mathugama Substation, via a 27 kilometres (17 mi) long 132 kV double-circuit transmission line.