BESS for ancillary services in India: revenue stacking finally arrives
India's Central Electricity Regulatory Commission (CERC) approved the unified ancillary services regulation in March 2026, opening BESS revenue stacking to standalone storage projects. The framework allows BESS to earn from energy markets, frequency regulation, and secondary reserves concurrently — addressing a long-standing gap in Indian storage economics.
In 50 words: India's CERC approved the unified Ancillary Services Regulation in March 2026, allowing standalone BESS to earn from energy markets, frequency regulation, and secondary reserves simultaneously. The framework finally enables revenue stacking — addressing the long-standing gap that made Indian standalone BESS economics dependent on single-revenue sources.
What's new
The CERC Ancillary Services Regulation 2026 establishes:
- A unified framework for primary, secondary, and tertiary reserves
- BESS-eligible participation in all three categories
- Market-based pricing (replacing the previous regulated payment structure)
- Settlement at 15-minute granularity
Why it matters
Pre-2026, standalone BESS in India earned primarily from energy arbitrage on the Indian Energy Exchange — a single, often thin revenue source. Coupling BESS to solar via SECI hybrid tenders was the workaround.
The new framework lets standalone BESS owners stack revenue: energy market participation + frequency response + secondary reserve provision. Modeled total revenue per kWh storage capacity is 30–50% higher than energy-only operation.
Open implementation questions
The regulation passed but execution depends on:
- Grid-India (POSOCO) operationalising the secondary reserve market — expected Q3 2026
- State-level adoption — interstate ancillary services are clear; intrastate participation requires state utility commissions to align
- Metering and telemetry standards — BESS reporting requirements still under detailed rules
Practical impact for developers
For standalone BESS projects bidding into India's emerging market, revenue modeling now needs to include all three streams:
- Energy market (IEX day-ahead, real-time)
- Primary reserve / frequency regulation
- Secondary reserve
Conservative modeling: 60% energy, 30% reserves, 10% other (depending on technology and dispatch profile).
What to watch next
The first BESS resource to register and participate in the new secondary reserve market will set the tariff discovery baseline. Expected Q3 2026. The market price discovered there determines whether revenue stacking actually delivers the 30–50% uplift in practice.
Researched and drafted with AI assistance; reviewed and edited by the named editor within 24 hours of draft.