India is adding solar and wind capacity faster than almost any country on earth — but speed alone doesn’t solve the grid’s oldest problem. When the sun sets and the wind drops, generation can fall off a cliff.
In the forested hills of Andhra Pradesh, a massive infrastructure project is now taking shape to address exactly that. Using technology that predates lithium-ion batteries by more than a century, it’s designed to store enough energy to supply roughly three million households — and it may signal where India’s energy transition is really headed.
The storage gap behind India’s renewable ambitions
India’s renewable buildout is among the most ambitious on the planet, but scaling solar and wind creates an inherent tension: both sources are intermittent. Without a way to store surplus generation and release it on demand, a grid increasingly dependent on them becomes fragile. That tension is now driving serious investment in grid-scale storage.
Pumped-storage hydropower is the world’s largest form of energy storage — and one of the oldest. The concept is straightforward: use cheap, surplus electricity to pump water uphill into a reservoir, then release it downhill through turbines when demand spikes. It functions like a giant rechargeable battery carved into the landscape.
The Upper Sileru project in Andhra Pradesh is built to do exactly that. Nine 150 MW reversible turbine units deliver a combined 1.35 GW of capacity, which would rank it among the largest pumped-storage facilities in India once completed. The target date is 2030, and when operational, the plant could supply electricity equivalent to the annual consumption of roughly three million Indian households.
How the Upper Sileru plant will work
GE Vernova, which won the equipment contract from Megha Engineering & Infrastructures Limited (MEIL), will supply vertical Francis reversible turbines — machines engineered for high efficiency, flexible operation, and a lifespan spanning several decades. These aren’t off-the-shelf components. They’re purpose-built for a facility that needs to shift rapidly between storing and generating power.
That switching capability is central to the plant’s grid value. When solar generation floods the system midday and electricity prices fall, the plant pumps water uphill. When evening demand peaks and solar drops off, it reverses — releasing water to spin turbines and inject power back into the grid. The speed of that transition helps regulate grid frequency, a critical measure of stability.
GE Vernova’s scope goes well beyond equipment delivery: full engineering, design, manufacturing, testing, transportation, installation supervision, and commissioning support are all included. Much of that work will draw on its existing Indian operations, which span multiple technology and manufacturing centers and a workforce of over 10,000 employees, including more than 3,000 engineers.
A deepening partnership — and a broader pipeline
The Upper Sileru contract isn’t the first time GE Vernova and MEIL have worked together on pumped storage. They’re already collaborating on the Kundah hydropower project, where GE Vernova is supplying four 125 MW fixed-speed pumped-storage units. Upper Sileru is a significant step up in scale from that work.
GE Vernova holds around 30 percent of the world’s installed pumped-storage capacity and maintains a global development pipeline exceeding 3 GW. For MEIL, the project carries symbolic as well as practical weight — the company described it as a key milestone for India’s clean energy development, reflecting growing industrial confidence that pumped hydro can play a central role in the country’s grid future.
What this means for India’s energy transition
Large-scale, long-duration storage is genuinely difficult to replace, which is what makes projects like Upper Sileru matter. Battery storage has grown rapidly, but lithium-ion systems degrade over time and face real limitations at very large scales. Pumped-storage hydro, by contrast, offers low degradation and decades of reliable operation — advantages that become more valuable as grids carry higher shares of variable renewables.
The project is also expected to generate local employment and support skill development during its multi-year construction phase, layering an economic dimension onto the energy one.
Pumped hydro isn’t a universal solution. It requires suitable geography, reliable water availability, and long construction timelines — constraints that limit where and how quickly it can be deployed. The 2030 completion target for Upper Sileru reflects that reality honestly.
With India’s solar and wind capacity continuing to climb, the pressure to build storage at matching scale will only intensify. Upper Sileru is one answer to that pressure, and if it delivers as planned, it’s unlikely to be the last project of its kind. How quickly India can replicate and expand this model may prove to be one of the defining questions of its energy transition in the years ahead.