From Backup Power to Grid Infrastructure: Why BESS Needs a New Identity

India’s need for energy storage stems from the changing demands of its power system. As renewable capacity and electrification rise, the grid must manage power across different hours and locations while ensuring reliability.

September 21, 2026. By News Bureau

Tags:

articles

India’s conversation around Battery Energy Storage Systems has remained tied to a familiar image: a battery waiting in the background until the grid fails. That is too limited for the electricity system India is building.

The scale of renewable addition makes clear why. The Ministry of New and Renewable Energy reported that India added 44.5 GW of renewable capacity in 2025, nearly twice the capacity added in the comparable period a year earlier. Solar and wind are changing the shape of supply; demand does not follow the same pattern. A grid with more variable generation needs assets that can respond, rebalance and dispatch when the system requires them.

That is why BESS needs a new identity. Its value lies in the services it delivers to the power system, not simply in the electricity it holds.

Backup is One Application, Not the Definition

Traditional backup is event-driven. It is called upon after a disruption. Grid-scale storage should be engaged before stress reaches the consumer: absorbing renewable surplus during high-generation hours, releasing power into evening peaks, regulating frequency, supporting voltage where needed and reducing renewable curtailment.

Storage can make intermittent generation more schedulable, reduce reliance on costly peaking power and, in constrained areas, defer a portion of network reinforcement. The central point is straightforward: it makes the grid and connected renewable capacity more useful.

The Economics Must be Measured Across the System

A narrow upfront-cost comparison has kept storage stuck in the backup category. The right comparison is no longer a battery versus a diesel generator alone. It is a battery versus the system costs it can avoid or optimise over its life: curtailed clean generation, peak procurement, diesel use, poor power quality and capacity built for only a few high-demand hours.

Storage must be valued as a bundle of services. A project created for arbitrage is different from one designed for ancillary services or congestion relief. The contract must be clear about cycles, dispatch duration, availability, response time and degradation, rather than leave them as an afterthought.

Deployment is now real. In a March 2026 Press Release, the Ministry of Power reported 798 MWh of installed BESS capacity in projects above 1 MWh and 35.8 GWh under construction. That gap shows the move from pilots to system-scale assets has begun; delivery must now meet a higher performance standard.

Engineering Must Match Infrastructure Responsibility

Once a BESS is asked to perform critical grid functions, it cannot be treated as a commoditised container. Indian conditions make that clear. High ambient temperatures, diverse duty cycles, changing load profiles and grid-quality variations test a battery in ways a standard datasheet cannot capture.

Cell selection, thermal architecture, protection systems, BMS, EMS, fire safety, site integration and remote diagnostics work as a single system. Long-term performance depends on how it is designed, commissioned and operated. Procurement should look past a low headline tariff and ask for availability guarantees, safety architecture, augmentation planning, service response and data visibility through the life of the asset.

Storage projects will earn trust by delivering predictably during peaks, grid events and high-renewable periods. That is an operations standard, not merely a hardware standard.

The Grid has to Buy Outcomes, Not Boxes

Policy has recognised energy storage as an integral part of the power system, and the market is beginning to follow. The next step is practical. Utilities, distribution companies and renewable developers need procurement structures that identify the service required at a particular location: evening-ramp support, peak shaving, renewable firming, frequency response or resilience. Payments should reflect the availability and quality of that service.

This gives technology providers a use case to design around, rather than a generic tender that risks oversizing or underutilising the asset. It can also make projects more bankable, strengthen operational accountability and give financiers a clearer view of performance risk.

India’s need for energy storage stems from the changing demands of its power system. As renewable capacity and electrification rise, the grid must manage power across different hours and locations while ensuring reliability. BESS should therefore be treated as flexible, dispatchable infrastructure that strengthens system balance and responsiveness.

The question for the sector is no longer, “How many hours of backup can this battery provide?” It is, “Which grid service can it reliably deliver, at which point in the system, and under what operating conditions?” That identity shift will make BESS central to India’s power transition.

- Hiren Pravin Shah, Managing Director & CEO, REPLUS Engitech