Thiruvananthapuram, Kerala: Rooftop solar power producers can continue using the existing profitable net metering system without batteries for installations up to 10 kW. For systems above 10 kW and up to 20 kW, producers may continue net metering by adding battery storage. However, solar power plants to be commissioned after April 1, 2027, will require battery storage for capacities above 5 kW.

The Kerala State Electricity Regulatory Commission has issued revised rules governing renewable electricity generation, including solar power. The updated regulations will remain in force until 2030.

Under the new framework, excess electricity generated through net metering can be utilised across other industrial establishments owned by the same producer. In areas without a night phase, the existing single-phase inverter of up to 5 kW can be used.

All plants that have obtained a feasibility certificate by November 6 will be considered existing installations. The new billing system will take effect on January 1, 2026.

Battery storage requirements

To continue with the net metering system, installations above 10 kW must have 10 per cent battery storage, while installations above 15 kW will require 20 per cent. For plants becoming operational after April 1, 2027, those above 5 kW must include 10 per cent battery storage. Electricity stored in batteries and supplied to the grid at night will fetch ₹7.50 per unit for the producer.

Grid support charge

A grid support charge will apply to excess power fed into the grid from installations above 10 kW. The rate will be 50 paise per unit for the first 300 units withdrawn in a month and ₹1 per unit thereafter.

Energy banking

Surplus electricity generated every month can be carried forward and offset against consumption in subsequent months until the end of the financial year. Existing producers will receive ₹3.80 per unit for surplus power at the end of the year, while new producers will receive ₹2.79 per unit.

Industrial and agricultural limits

Industrial units will be allowed to use net metering for installations up to 500 kW. For installations above 25 kW and up to 100 kW, 10 per cent battery storage will be required. For installations between 100 kW and 500 kW, 20 per cent battery storage will be necessary. For agricultural use, net metering up to 3,000 kW can be continued.