Koyna Hydroelectric Project, Hydroelectric power complex in Satara district, Maharashtra, India.

The Koyna Hydroelectric Project is a facility with four dams along the Koyna River in Satara district and uses underground powerhouses to generate electricity. The installation spans multiple stages with water tunnels that channel flow toward the turbines.

Construction of this facility started in the 1950s as a two-stage project but was later expanded to meet growing regional electricity demand. Over the decades, the site was divided into multiple phases to increase its output.

The name reflects the Koyna River, which has shaped the region's economy for decades through its role in generating power. Local communities have grown alongside this energy source and its impact on their lives.

Visitors can find viewing points at the dams where water levels and surrounding landscapes are visible from above. The best time to visit is after the monsoon season, when water levels are higher and visibility improves.

Stage IV, added in the 1980s, draws water through an intake made by blasting a rock plug from the lake bed, a double lake tapping process described as the first of its kind in Asia. Its four 250 MW Francis units sit in an underground powerhouse reached by vertical pressure shafts.