KSEB Solar Net Metering Explained: Bi-Directional Billing, Banking Rules & KSERC Tariff Settlement

Net metering is an electricity billing mechanism that allows consumers who generate their own electricity from rooftop solar systems to feed excess electricity back into the KSEB grid. Unlike standard utility meters that register power flow only in one direction, a bi-directional meter records both forward flow (electricity drawn from KSEB) and reverse flow (electricity injected by your solar inverter).

When your rooftop solar array generates 4 kW during noon, and your home consumes 1.5 kW (refrigerators, fans, lights), the remaining 2.5 kW flows backward through the net meter into the KSEB grid, turning your energy counter backward in credit terms.

Under KSERC regulations, the settlement period for net metering in Kerala runs from October 1 of a calendar year to September 30 of the following year. This annual window is specifically advantageous for Kerala climate conditions because it allows solar owners to bank substantial surplus units during sunny summer months (January to May) to offset cloudy monsoon periods (June to August).

If at the end of the settlement year (September 30), the consumer has net surplus exported units remaining in their account, KSEB compensates the consumer for these surplus units at the Commission-approved Average Power Purchase Cost (APPC rate, typically around ₹3.20 to ₹3.50 per unit).

Kerala State Electricity Regulatory Commission structures domestic electricity billing on a progressive telescopic tariff. The first 50 units are priced modestly, but as usage exceeds 250 units, the tariff rises steeply. Net metering offsets energy starting from the highest, most expensive slab downward.

By suppressing net consumption below 100 or 0 units, a homeowner avoids paying peak unit rates, fuel surcharge adjustments, and high electricity duty percentages.

The bi-directional meter installed must comply with CEA (Installation and Operation of Meters) Regulations and Indian Standard IS 13779 / IS 14697. It is either procured directly by the consumer through approved manufacturers or supplied by KSEB upon payment of testing fees.

Before field installation, the meter undergoes rigorous calibration and accuracy testing at an accredited KSEB Meter Testing Laboratory (TMR Division) to ensure zero metering deviation.