What if one of the most credible answers to India's energy transition is a technology that is 160 years old?
We spend a great deal of time talking about the future of batteries — gigafactories, new chemistries, next-generation storage. And rightly so; India's clean energy ambition demands bold bets. But in our enthusiasm for what is coming, we have quietly stopped asking a harder question: are we being honest about what we already have?
This is not an argument against innovation — it is one that supplements it. The scale of India's storage challenge, 411.4 GWh needed by 2031–32 per the Central Electricity Authority's National Electricity Plan, is too large to solve with a single answer. Which brings me to the lead acid battery: managed well, one of the most credible circular economy assets India possesses, and a case rarely made with the seriousness it deserves.
Generation is Outpacing Storage
India's renewable achievement is real: capacity crossed 250 GW by late 2025, and the country hit its 500 GW non-fossil target years ahead of schedule. But generation and storage are different problems. In April 2026, peak demand hit 256 GW; nearly a third was met by renewables, yet the grid still leaned on thermal power for the evening peak — because there wasn't enough storage to hold the clean energy already being generated. With BloombergNEF projecting global storage to grow seventeen-fold by 2035, the question for India is not whether to build storage, but which technologies we can deploy at the speed, cost and supply-chain depth we require.
The Technology Already At Work
Lithium-ion is the deserved frontrunner for grid-scale storage. But India is not a single market. It is the telecom tower backup behind 600 million mobile connections; the home and business inverters relied on across states with uneven grids; the electric three-wheelers that are the workhorses of tier 2 and tier 3 India, for whom cost is a constraint, not a preference.
The numbers bear this out: the lead acid market, valued at $5.6 billion in 2024 and projected to reach $9.23 billion by 2035, is 55% of the country's entire battery materials market. And the cost gap is decisive — lead acid runs ₹8,000–12,000 per kWh against lithium-ion's ₹20,000–30,000. For rural solar and community microgrids, that is not a footnote. It is the deciding factor.
The Circular Economy Advantage
This is where our industry has undersold itself — and where, for any leader, the proof of the pudding lies. Sustainability claimed is easy; sustainability demonstrated is the test. Unlike most battery chemistries, lead acid's closed loop is not a future promise. It has been operational for decades.
Lead is among the most recycled materials on Earth, with recycling rates exceeding 99% in mature markets — the highest of any consumer product. A spent battery's lead, plastic and acid are almost entirely recoverable, and the lead can be reused indefinitely with no loss of performance. India's secondary lead already supplies more than 80% of domestic output, drawing on that infinite recyclability and the far lower energy cost of secondary smelting.
The loop is so economically sound that it sustains itself without subsidy — which is why the World Economic Forum and MIT have called lead acid recycling one of the most successful circular economies in existence. It is the model that newer chemistries, whose recovery networks are still being built, aspire to reach.
Honesty demands we name the problem too. Of the roughly one million tonnes of used batteries India recycles each year, 25–30% still moves through informal operators — backyard smelting outside any safety or environmental control, exposing workers and communities, children among them, to lead. That is not a case against the technology; it is the strongest case for formalising it.
The Battery Waste Management Rules of 2022, with Extended Producer Responsibility targets of 80% recovery by 2026 rising to 90%, are the right instrument. The responsibility of those of us who manufacture is to meet them in full — to invest in formal recovery and bring that lead back into a clean, closed loop. Closing the gap between what the rules require and what happens on the ground is a problem of governance and commitment, not technology.
The Real Measure of Sustainability
As World Environment Day asks what a sustainable future requires, one observation is worth sitting with: the greenest solution is not always the newest. Sustainability is about using resources wisely, recovering them fully and building systems that endure. By those measures, the lead acid battery — domestically made, deeply embedded in India's energy infrastructure, and able to close its own material loop more completely than any other chemistry — deserves a more serious place in our clean energy thinking.
The transition needs all technologies: lithium-ion for grid scale, hydrogen for long duration, and lead acid for the affordable, recyclable, locally anchored foundation it already provides. Acknowledging that is not a retreat from ambition. It is what a holistic industrial strategy looks like.