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 assets that typically last 50 to 80 years.

Its constraint—and its moat—is cost and complexity.

Recent projects underline this. Tamil Nadu’s 1,000 MW Upper Bhavani PSP costs about Rs 5,005 crore. Of this, nearly half is spent on civil and hydro-mechanical works alone. At Tehri in Uttarakhand, another 1,000 MW project is expected to cost around Rs 8,339 crore.

Thus, this is not infrastructure that can be rolled out quickly or replicated easily. A viable PSP requires favourable terrain and elevation, stable geology for long tunnels and underground caverns, environmental approvals and the balance sheet to absorb Rs 5,000–8,000 crore of capex well before revenues begin.

These hurdles sharply limit participation. Unlike battery storage, where manufacturing scale and global supply chains drive competition, pumped storage is site-bound, approval-heavy and execution-intensive.

That difficulty is precisely why PSP economics tend to be steadier. High entry barriers keep competition thin, assets scarce and project lives long. For investors, pumped storage looks less like a technology race and more like old-school infrastructure—slow to build, hard to replicate, and valuable once in place.

Where value sits in pumped storage

Unlike lithium batteries, where manufacturing scale and global pricing dominate economics, pumped storage is defined by scarcity and engineering difficulty. Each layer of the value chain reflects that.

1) Site sponsors

Everything begins with location. The Central Electricity Authority (CEA) plays a central role here, setting guidelines for pumped-storage project reports and assessing geology, environmental impact and grid integration. A small group of listed companies dominates this site-control layer:

• JSW Energy is the most aggressive mover. By late 2025, it had about 29.4 GWh of storage in its pipeline, of which 26.4 GWh was PSP. Its flagship Bhavali project carries a 40-year contract with Maharashtra’s discom at around Rs 84.7 lakh per MW per year, with commissioning staggered over the next four years.
• Tata Power has agreements for 2,800 MW of PSP storage at Shirawta and Bhivpuri in Maharashtra for an estimated Rs 13,000 crore of investment. Shirawta alone accounts for nearly Rs 11,000 crore, with commissioning targeted toward the end of the decade.
• NHPC, India’s hydro specialist, has bundled multiple PSP proposals in Andhra Pradesh under a joint venture called ANGEL.
• NLC India is repositioning itself. Out of a Rs 1.17 lakh crore capex plan over the next four to five years, around Rs 41,000 crore is earmarked for green energy, including PSP projects, as it targets 10 GW each of thermal and renewable capacity by 2030.
• NTPC is shifting toward ‘dispatchable clean energy’. It has signed a 50:50 joint venture with EDF for PSP and hydro projects and is also involved in the Upper Bhavani PSP through its Tamil Nadu arm.

For investors, this layer is closest to owning the land under a toll road. Sites are scarce, approvals are slow, and replication is difficult.

2) Civil work players

Once a site is secured, the hardest part begins. Civil construction—tunnels, dams, underground caverns, surge shafts and access roads—typically accounts for more than half the project cost. This is not routine construction. Weak rock, water ingress, unstable slopes and kilometre-long tunnels make PSP one of the most technically demanding EPC segments in the country.

A small circle of contractors dominates this work:

• L&T, with decades of experience in heavy civil engineering, recently won a Rs 1,000–2,000 crore package for the Bhavali PSP.
• Hindustan Construction Company has executed some of India’s most complex hydropower projects, particularly in difficult Himalayan geology, giving it deep expertise in long tunnels and underground caverns.
• Patel Engineering brings similar credentials, with major hydro projects like Subansiri Lower and Tapovan Vishnugad in its portfolio. A large part of its order book remains hydro- and PSP-linked.

These skills are learned slowly and expensively. They are not easily cloned.

3) Turbines, pumps and generator makers

If civil works are the skeleton of a PSP plant, the electro-mechanical equipment is its heart. The dominant domestic supplier here is BHEL, whose hydro division manufactures reversible pump-turbines (up to 300 MW per unit), generator-motors, digital governors and valves. Its facilities in Bhopal have supplied equipment to many of India’s large hydro projects and remain central to PSP execution.

This equipment is designed to last decades, is refurbished rather than replaced, and is often tied to long-term operation and maintenance contracts, creating steady, annuity-like revenue once installed.

PSP versus batteries: Two very different moats

Seen side by side, the contrast with lithium-based storage is stark.

BESS is modular, manufacturing-heavy and exposed to global supply. China dominates global cell capacity. India has tendered more than 80 GWh of BESS since 2021, but actual deployment remains limited, and ultra-low bids below Rs 1.5 per unit raise questions about long-term sustainability and safety.

PSP, by contrast, is slow, site-bound and long-lived. Suitable locations are scarce, especially where existing reservoirs can be paired. Capex per MW is higher but relatively predictable, typically Rs 5–8 crore per MW, especially as asset life runs into decades, not product cycles. The main risks are geological surprises, permitting delays and execution overruns—not global oversupply.

From an investment lens, that leads to a clear split.

In battery storage, oversupply risk sits with battery cells and commodity pack assembly players, while more durable economics may lie in niche chemicals, control systems and integrators.

In pumped storage, value concentrates around site-owning developers and a small ecosystem of specialist civil contractors and equipment suppliers. These are not capabilities that can be conjured up by announcing new factories.

Both forms of storage will grow. Energy storage is a multi-decade theme. That part is obvious. The challenge is understanding where, within each value chain, durable value accumulates, and where competition eventually compresses returns. PSP, for now, offers steadier economics.

Where the real storage winners lie

Energy storage will grow across technologies. The harder question is where durable returns will accrue as competition intensifies. Our analysts at Value Research Stock Advisor are tracking the emerging opportunity in battery storage—focusing on balance-sheet strength, execution capability and long-term economics. And they have a recommendation that can turn this multi-decade theme into sustained shareholder returns. Join Stock Advisor to find out. 

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