The clean energy storage opportunity few are talking about

Summary: While the market obsesses over batteries, India is planning a far larger storage buildout elsewhere. Backed by government projections and shaped by high entry barriers, this clean-energy infrastructure offers a very different risk–reward profile. In our previous story, we examined battery energy storage systems (BESS), now indispensable to India’s renewable energy transition. As renewable generation rises, so does the need to store excess power for use when the grid needs it most. That story unpacked the BESS value chain—chemicals, cells, gigafactories and integrators. But batteries are not the only way to store energy at scale. The other system, now gaining equal strategic importance, is pumped-storage hydropower (PSP). If lithium batteries are the power grid’s USB drives—portable and efficient—pumped storage is the hard drive—slow to build and designed to run quietly for decades. In this copy, we highlight the pumped storage opportunity, who is building what and which listed companies sit closest to the economic moat. A storage boom, hiding in plain sight The government estimates India will need 82.4 GWh of storage capacity by 2026–27. Strikingly, PSP capacity accounts for the larger share—47.7 GWh, against 34.7 GWh from batteries. By 2031–32, total storage requirement rises to 411.4 GWh, with 175.2 GWh from pumped storage and 236.2 GWh from battery systems. The implication is clear. Even as batteries scale up, pumped storage remains a core pillar of India’s grid—not a legacy technology being tolerated, but a capacity being actively planned. The moat in pumped storage A pumped-storage plant is, in essence, a battery that uses water and gravity. Two reservoirs sit at different heights, connected by tunnels and turbines. When power is abundant or in excess (midday solar or night-time wind), it is used to pump water uphill. When electricity is needed, the water is released downhill through turbines, generating power just like a conventional hydro plant. The appeal lies in scale and longevity. Pumped storage can deliver large blocks of power for hours at a time, with round-trip efficiency of about 70–80 per cent, and