Battery Storage
Intelligence
Weekly perspectives on BESS technology, policy, costs and the energy transition — written for India's C&I decision-makers.
Solar Without Storage is Half a Solution — A 200 kW / 765 kWh BESS Case Study from Pune
A Pune factory was exporting 72% of its rooftop solar at ₹2.8/unit and buying power back in the evening at ₹14.3/unit. A correctly sized 200 kW / 765 kWh BESS solved the timing mismatch — delivering ₹27.3 Lakhs net Year-1 return, eliminating Thursday diesel dependence, and staying cash-positive from Month 1 under an OpEx lease.
Read Case Study →Cheapest Electron at Your Meter: How BESS Maximises Arbitrage Under REES Policy 2025-36
Maharashtra's REES Policy 2025-36 has created ₹6–19/kVAh in arbitrage spread for HT & commercial consumers. Section 5.1 waives ₹2.97–3.87/kVAh in charges on the BESS charging leg. Here is the complete strategic framework — ToD spreads, demand charge shaving, Group Captive OA, and the 2-hour vs. 4-hour sizing decision.
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Grid is No Longer a Free Battery — Maharashtra's Energy Rules Have Changed
MERC's MYT Order 75 of 2025 has permanently closed solar banking arbitrage, activated Grid Support Charges at ₹1.40/unit, and redesigned Time-of-Day tariffs for every C&I consumer in Maharashtra. Here is the complete strategic analysis — including the full 5-year HT tariff table through FY 2030.
Read Regulatory Insight No. 01 →BESS vs Diesel Generator in India: The Real Cost Comparison CFOs Need to See
Most facilities calculate diesel costs at fuel price only. Add thermal losses, maintenance, operator cost and the 10–30 second production gap — and the true cost of DG backup is 3–4× higher than the fuel bill suggests. Here is the full P&L comparison.
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