Rahul Das, AVP – Business Development at Oorjan Cleantech
Ask a chief financial officer what electricity costs the business and you will get a number. Ask what an hour of unplanned downtime costs and the answer is usually vaguer, larger, and harder to defend in a budget meeting. That asymmetry explains why energy investment in Indian industry has historically been justified on unit cost savings, with reliability treated as an afterthought handled by a diesel generator in the corner of the yard.
That framing is becoming inadequate, for reasons that have less to do with sustainability reporting than with the changing shape of the grid businesses depend on.
The grid is getting cleaner and less predictable at the same time
India’s power system is undergoing a structural change. The Central Electricity Authority’s long-term resource adequacy plan, published in March 2026, envisages non-fossil capacity reaching roughly 786 GW by 2035–36, around 70% of total installed capacity, up from about 52% in January 2026. It projects a need for around 174 GW and 888 GWh of energy storage over the same horizon.
Meanwhile demand is rising sharply. Union Power Minister Manohar Lal noted at India Energy Storage Week 2026 that India’s peak demand had reached an estimated 271 GW and was expected to approach 300 GW, driven by data centres, artificial intelligence workloads and electric vehicles.
A system with a very high share of variable generation and rapidly growing demand is a system with more pronounced daily ramps and greater sensitivity to weather. It is also, over time, a cheaper system. Both things are true simultaneously, and both have implications for a business that draws power from it.
For commercial consumers, this manifests in three ways: sharper price differences between hours of the day, more regulatory intervention in when you consume, and a grid whose reliability characteristics are changing rather than simply improving.
Resilience is now measurable in more places than the P&L
Several forces are converging to make supply reliability a board-level concern rather than a facilities issue.
Process industries increasingly run equipment where an unplanned stop causes material loss rather than just lost time. Batch chemical, pharmaceutical, glass, cold chain and semiconductor-adjacent operations all fall into this category, and India is actively adding capacity in each.
Digital infrastructure has raised the bar. The IESA and Customized Energy Solutions research on the Indian C&I storage market identifies data centres and critical infrastructure such as hospitals, metro and rail stations and airports as the fastest-growing segments for storage adoption, while industrial facilities remain the largest.
Customer and supply chain expectations have hardened. Multinational buyers increasingly ask suppliers to document not only emissions but continuity arrangements. Sub-second interruptions that reset programmable controllers are a quality problem before they are an energy problem.
Diesel is becoming a less comfortable default. Beyond delivered costs in the range of ₹18–30 per kWh, generators carry emissions compliance exposure that is tightening in urban and industrial areas, and they produce nothing on the many days when the supply holds.
What solar plus storage actually provides
The combination delivers something neither component provides alone, and it is worth being precise about what.
Solar provides low-cost energy during daylight hours and a hedge against tariff escalation for the life of the asset. It does not provide reliability, because it fails precisely when the grid is most stressed at dusk, and it does not provide firmness.
Storage provides the timing control and the ride-through capability. It responds in milliseconds, which is fast enough that sensitive equipment does not register the transition. It covers the short interruptions that make up most outage events at Indian industrial sites. It holds recorded maximum demand below a chosen ceiling. And it converts solar from an intermittent input into a schedulable one.
Together they change the risk profile of the facility rather than just its cost base. That is a different kind of investment, and it deserves a different kind of evaluation.
Resilience against price, not just against outages
The under-discussed dimension of resilience is financial. Electricity tariffs in India are set by regulators on multi-year cycles and revised, sometimes substantially, in between. In Maharashtra alone, C&I consumers have absorbed a restructured time-of-day regime, a new charge on rooftop generation, and restrictions on banking within roughly eighteen months.
A business whose electricity cost is entirely determined by a tariff it does not control has no hedge. A business generating a share of its own power and controlling when it draws the rest has a partial one. As the share of self-generated and self-scheduled energy rises, exposure to regulatory revision falls proportionally.
This is a meaningful argument for storage that rarely appears in vendor proposals, because it is a risk management benefit rather than a savings line. It is nonetheless real, and for businesses with long planning horizons it may be the most durable part of the case.
Why this is becoming achievable
The reason resilience arguments are landing now, when they did not five years ago, is that the cost of acting on them has fallen dramatically.
BloombergNEF’s 2025 survey put average lithium-ion pack prices at $108/kWh, 93% below 2010, with stationary storage packs at around $70/kWh after a 45% single-year fall. Turnkey grid-scale systems in India are quoted around ₹1.5–1.8 crore per MWh, and competitive auction tariffs for standalone storage have fallen roughly 86% since 2022.
Deployment has responded in kind. India’s operational battery storage capacity grew eleven-fold in a year to around 8.5 GWh by mid-2026, with a substantial share built as merchant capacity outside government tenders. The IESA and Customized Energy Solutions project C&I storage in India reaching as much as 31 GWh by 2032, alongside C&I renewable capacity rising from 32 GW to as much as 100 GW.
Debmalya Sen, President of the India Energy Storage Alliance, characterised the shift in that segment as storage “becoming a strategic tool for resilience and decarbonization, not just backup.”
What a future-ready configuration looks like
It is not a maximalist one. Businesses that pursue full energy independence generally overbuild, because covering the worst monsoon week requires capacity that sits idle for the rest of the year.
A more defensible configuration has four features. Solar sized to the roof and, where load exceeds what the roof can serve, supplemented through open access. Storage sized against interval load data to capture the tariff spread and defend a chosen demand ceiling, rather than sized to a rule of thumb. An existing generator retained for rare deep outages while the battery handles frequent short ones. And controls capable of being reconfigured as tariffs change, because in Maharashtra the rebate schedule is already published as stepping up from FY 2027–28.
The honest caveat
Not every business needs this now. A single-shift operation with reliable supply, low evening load and no critical process may find that solar alone remains the right answer for another few years, and there is no virtue in buying capability you cannot use.
But the underlying trend is not in doubt. Maharashtra now requires storage with new renewable projects above 100 kW and moves to a four-hour requirement for projects commissioned from FY 2030–31. Several other large states are reported to be evaluating comparable frameworks. National storage requirements run into the hundreds of gigawatt-hours over the next decade.
The businesses that treat this as a planning problem to solve on their own timetable will make better decisions than those that treat it as a compliance obligation to satisfy at the last moment. The difference between the two is mostly a matter of when the analysis starts.
