August 22, 2026: India’s renewable solar energy market is entering a new phase in which battery storage could become a key differentiator for projects seeking power purchase agreements, with nearly 42 gigawatts (GW) of planned capacity yet to secure offtake contracts.
Renewable Energy Secretary Santosh Kumar Sarangi said projects without battery storage could increasingly struggle to attract buyers as the power system grapples with a growing mismatch between renewable generation and grid demand.
Speaking at the BNEF Summit in New Delhi on Friday, Santosh Sarangi said around 18 GW of solar-only projects and another 14-15 GW of capacity awarded at relatively high tariffs are among the projects facing greater offtake risks.
The development could create a significant new market for battery energy storage systems as developers look to make their projects more dispatchable and attractive to power buyers.
Solar growth shifts focus to storage
India’s rapid expansion of photovoltaic capacity has produced a new challenge for the renewable energy sector. Solar generation is increasingly concentrated during daylight hours, creating periods of surplus electricity when output exceeds the grid’s ability to absorb it.
The issue becomes more pronounced during summer, when stronger renewable radiation pushes generation higher even as the power system faces intense demand.
Around 11 per cent of renewable energy generation was curtailed during the hottest months this year, highlighting the growing value of technologies that can shift renewable electricity from periods of surplus to periods of higher demand.
For developers, batteries offer a way to extend the usefulness of solar generation beyond peak daylight hours. Instead of being limited to supplying power when solar output is highest, storage-backed projects can potentially deliver electricity into evening demand periods and other grid-stressed hours.
That is increasingly becoming an important consideration for buyers looking for more reliable renewable power.
11% Solar Curtailment Makes Storage a New Growth Engine for Renewables
The scale of the pipeline at risk could provide a substantial growth opportunity for India’s battery storage industry.
Of the nearly 42 GW of renewable projects without signed offtake contracts, the 18 GW of solar-only capacity is particularly exposed to the changing requirements of buyers. Projects awarded at higher prices could also face pressure as buyers become more selective about both cost and delivery profiles.
The result could be a shift in project design, with developers adding batteries not merely as an optional technology but as a tool to improve the commercial viability of projects.
As storage costs decline and deployment expands, the 42 GW pipeline could therefore become an important source of incremental demand for battery systems, particularly for projects that need to provide power across a wider part of the day.
Grid constraints strengthen the case
The storage opportunity is also being driven by constraints in India’s transmission network.
More than 8 billion kilowatt-hours of electricity could not be absorbed by the transmission system between April and June, even as about 63 billion kWh reached the grid during the period. Curtailment peaked in May, when temperatures pushed electricity consumption to a record.
Around 21 GW of renewable energy projects have only part-time access to the grid, according to Sarangi, putting these projects at higher risk of curtailment.
Northern and western regions have faced particular challenges in expanding transmission capacity at the same pace as solar generation.
Battery storage cannot replace transmission investment, but it can help manage the timing mismatch between generation and consumption. This makes storage increasingly relevant as India builds renewable capacity faster than its grid infrastructure is expanding in some regions.
Storage moves from add-on to growth driver
The emerging trend could reshape India’s renewable investment cycle.
The first phase of the country’s solar boom was largely focused on adding low-cost generation. The next phase is likely to place greater emphasis on dispatchability, flexibility and grid integration.
For developers, that means the ability to pair solar generation with storage could become an increasingly important competitive advantage when seeking long-term buyers.
For battery manufacturers and energy-storage developers, meanwhile, the 42 GW pipeline represents a potential pool of projects that could require storage solutions to move forward.
India’s renewable market is therefore moving beyond the question of how many gigawatts can be installed. The bigger opportunity is increasingly about how those gigawatts can be made more flexible, deliverable and valuable to the grid.
With 42 GW of capacity still seeking offtake, battery storage could emerge as one of the biggest growth markets created by India’s next stage of renewable expansion.
