Pumped Storage: India Has 7.43 GW Running, 345.38 GW Mapped

Pumped storage hydropower, often called a water battery, stores electricity by lifting water to a higher reservoir and releasing it through turbines when power is needed. A government backgrounder issued on 2 November 2026 explains why this old technology has become central to India's clean energy plans. As of September 2026 the country had 308.027 GW of installed non-fossil generation capacity, having added about 55.29 GW of it during FY 2025-26, and the target is 500 GW of non-fossil capacity by 2030.

Why storage matters

Solar and wind output rises and falls with sunlight, weather and the hour of the day, so electricity has to be stored when generation runs ahead of demand and drawn down when it falls behind. The Central Electricity Authority expects storage needs of 73.93 GW by 2031-32, made up of 26.69 GW from pumped storage projects and 47.24 GW from battery energy storage systems. Batteries answer quickly and suit frequency regulation and short peaks; pumped storage shifts much larger volumes of electricity over longer stretches of time and lasts for decades, though it needs the right terrain.

The three types

• On-stream: both reservoirs sit on a river, stream or nallah
• Off-stream open-loop: one reservoir is on a watercourse and the other is not
• Off-stream closed-loop: neither reservoir sits on a river or a perennial stream, which is why these are preferred for faster clearance and less harm to aquatic life

Where India stands

Operational capacity stood at 7.43 GW across 10 projects as of August 2026, each above 25 MW in size. A further 15.87 GW across 11 projects is under construction or implementation, and 10.40 GW across 8 projects has been concurred or appraised by the authority. In all, 320 pumped storage sites have been identified with a combined potential of 345.38 GW, of which 62 on-stream schemes account for 56.67 GW and 258 off-stream schemes for 288.71 GW.

Region-wise potential

The Western Region leads because rivers rising in the Western Ghats fall steeply, which suits reservoirs at two heights. Looking ahead, the authority has mapped commissioning of 100.81 GW by 2035-36, which would take cumulative pumped storage capacity to 105.56 GW.

How the government is helping

Guidelines to promote these projects were notified in April 2023, and tariff-based competitive bidding guidelines followed in February 2025. Budget support covers roads, bridges, railway sidings, ropeways and transmission lines. Projects awarded for construction by 30 June 2028 get a full waiver of inter-state transmission charges for 25 years from commercial operation. The concurrence timeline for a detailed project report has been cut from 90 days to 50 days, environmental appraisal has been eased for eligible schemes, and the capital expenditure limit needing the authority's concurrence was revised to 3,000 crore rupees, with closed-loop off-stream schemes exempted altogether.

The world picture

Pumped storage is the most widely used form of large-scale storage anywhere. Global capacity stood at 159.8 GW at the end of 2025, with China at close to 66 GW, Japan around 22 GW and the United States about 19 GW. India ranked fourth with 7.18 GW at that point, a figure that has since risen to 7.43 GW.