India’s 100 GW Pumped-Storage Push: How Water Batteries Are Shaping Clean Energy and Hydro-Geopolitics

For decades, rivers have been the central theme of India’s hydroelectric story. Dams were built to control water, to create electricity, and to transform entire valleys. But the next chapter for Indian hydropower may be more tricky: using water to store electricity itself. Pumped-storage hydropower is becoming an increasingly important large-scale rechargeable battery for the electricity supply in India. The Central Electricity Authority (CEA) has proposed to set up 100 GW of pumped-storage capacity by 2035-36. This is more than an infrastructure goal. That is a big shift in India’s attitude to electricity, water, and energy security. And it has the potential to make water one of the most strategically important resources in India's clean energy transformation. The reason is simple. India is rolling out renewables at a breakneck speed. Solar panels produce a lot of electricity during the day, and wind farms produce electricity when the conditions are right. But electric demand doesn’t always follow either schedule. The sun sets in the evening, yet millions of homes, businesses, and companies still need power. This is India’s real dilemma of the renewable transition—making clean electricity is no longer sufficient. India has to learn how to preserve it when nature stops producing it. And there you have the water battery.

A pumped-storage project typically has two reservoirs at different elevations. If there is excess electricity, for example, on a sunny afternoon, it is used to pump water from the lower reservoir to the upper reservoir. When demand is high, water is released downhill through turbines, which generate power. Unlike traditional batteries, pumped storage can store energy for much longer periods of time and cycle large amounts of electricity again and again. That flexibility is becoming more important in a grid that is increasingly dominated by variable renewable generation. The CEA’s roadmap estimates India’s storage requirement to grow sharply from around 62 GW in 2029-30 to 161 GW by 2034-35. The government’s 100-GW pumped storage target is thus a key component of a much broader push to make the renewable-dominant grid more stable. But it is India’s dream that is even more astonishing than its present reality. About 7 GW of pumped storage capacity was operating, and 12 GW was under construction by December 2025. However, CEA has pegged India’s potential at around 267 GW, which comprises both on- and off-stream projects. The gulf between promise and reality is huge. And it is where politics begins as well. India’s next generation of water batteries will require land, transmission infrastructure, capital, and, most importantly, water. The CEA estimates that the investment for the planned projects could be in the region of ₹5.8 lakh crore. So pumped storage is more than an engineering challenge. It is increasingly becoming a question of ownership of the geography of India's energy transition. Maharashtra, Karnataka, Andhra Pradesh, Odisha, and Madhya Pradesh are emerging as key destinations for pumped storage expansion. Some of the projects proposed are large. The CEA approved six pumped storage projects totaling around 7.5 GW in 2024-25, including the 2,000 MW Sharavathy project in Karnataka and projects in Maharashtra, Odisha, Madhya Pradesh, and Andhra Pradesh. This geographic relocation of India’s energy infrastructure may have implications beyond electricity generation. For decades, India’s energy map was dominated by coal belts and thermal power plants and railroad routes that carried fuel across the country. The renewable age is making a new map, powered by the sun, wind corridors, transmission lines, reservoirs, and elevation differences. The question is whether the water infrastructure of India can be the basis of this new map, without the environmental and social conflicts of previous hydroelectric schemes. It’s a question that’s increasingly hard to write off.

In January 2026, a report on CEA’s pumped-storage plan emphasized suggestions to relax environmental laws for some projects, including proposals for eco-sensitive zones and protected areas. The debate has been particularly heated in environmentally sensitive areas such as the Western Ghats. The result is a disturbing contradiction. India needs more storage capacity to take up renewable energy. But building that store can alter areas already under ecological stress. There is another side to the water debate. Not all pumped storage projects are the same. India is increasingly moving toward closed-loop, off-stream facilities that are more about energy storage than traditional river-based generation. The CEA's latest assessment estimates off-stream projects' potential at 209 GW against some 58 GW on-stream. This is an important distinction. Closed-loop systems can reduce dependence on a river that is flowing actively and can also potentially alter the environmental impact of a project. But the problems of land acquisition, building, transmission, water requirements, and local ecology remain. Here, the term "hydrogeopolitics" assumes a broader meaning.

India’s hydro-geopolitics is tightly interwoven with India’s disputes over transboundary rivers like the Brahmaputra with China, the Indus with Pakistan, the Ganga with Bangladesh, and so on. But India’s growing water-energy economy is giving rise to a different kind of hydro-geopolitics: a strategic scramble for water, land, and power infrastructure where they come together in India. It's not only individual projects that are at stake. Building 100 GW of pumped storage will put a country much better able to absorb solar and wind power, reduce the curtailment of renewables, and deal with peak demand for electricity. It could also reduce reliance on fossil fuel generation for grid balancing. Pumped storage, therefore, is an energy security tool. The government has already begun creating incentives for the industry, including tariff-based competitive bidding for storage, transmission-related assistance, and legislation to expedite project construction. But how fast the change happens will ultimately depend on whether India can answer a question that technology alone cannot answer: What is the acceptable level of social and environmental disruption for clean energy? There will be a temptation to regard pumped storage as an environmentally friendly option simply because the electricity it produces is renewable. That would be a mistake.

Infrastructure is still a water battery. Reservoirs still dominate the landscapes. There are still tunnels to drill. Transmission pathways will still need to cross communities and ecosystems. And water is not an endless resource just because India has a vast network of rivers and reservoirs. The great irony of India’s renewable revolution is that the hardest problem may not be getting more sunshine or wind. It is finding enough storage space for what they make. The 100 GW target could be one of the most important pieces of India’s clean-energy jigsaw. But success cannot be measured solely in gigawatts commissioned. The real question, of course, will be whether India can build its water batteries without turning water into the next fault line of the energy transition. The future of Indian hydropower may lie in not managing rivers. It could be about controlling when electricity runs and who decides where water, land, and power intersect.