Battery energy storage systems are shifting from niche support for solar to an electricity-market tool that shifts cheap generation into high-value hours and helps meet growing evening demand in India.
Regulatory change: CTUIL now allows increases in storage capacity (MWh) for grid-connected BESS without increasing approved MW connectivity, giving developers a clearer route to expand duration.
Market signal: Day-ahead market spreads and repeated ₹20/kWh price spikes show strong arbitrage potential for batteries, especially as solar moves cheap charging into afternoon hours.
How battery energy storage system is proving key to solar generation and supply By M Ramesh Updated. Government agencies are beginning to adapt the rules to make storage easier to deploy. A 100 MW/200 MWh battery can, for instance, become a 100 MW/400 MWh battery by adding storage capacity while retaining the same grid connection and power conversion capacity.
The other finding is equally interesting: longer-duration batteries earn more, but with diminishing returns. The latest example is the Central Transmission Utility of India (CTUIL), which last week issued a procedure for BESS projects that have grid connectivity to seek an increase in their energy-storage capacity (MWh) without increasing their approved charging/discharging capacity (MW). CTUIL's move gives developers a regulatory route to do this rather than having to treat the increase in MWh as an increase in grid connectivity.
After sunset, BESS is the best option for energy security. Pending clarification, it is not seeking BG-3 for such applications. The battery captures the most attractive price spreads first.
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