KSEB & Kerala Regulations7 min read

How KSEB Solar Net Metering Bills Are Calculated: Import, Export, Banking & Settlement

Detailed breakdown of how your KSEB bi-monthly electricity bill changes after installing rooftop solar. Understand energy banking, import vs export units, settlement cycles, and fixed demand charges.

By GSR Technical Engineering Desk·Published: February 15, 2026·Last verified: September 2026

Official Reference: Kerala State Electricity Regulatory Commission (KSERC) / KSEB WSS Portal(KSERC Renewable Energy Regulations & Tariff Orders)

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Disclaimer: GSR Energies is an independent solar EPC contractor empaneled for PM Surya Ghar & KSEB net-metering installations. Government policies and subsidy guidelines are referenced directly from MNRE/KSEB official notifications. Regulations, tariffs, fees and application procedures may change; confirm the latest official KSEB/KSERC/MNRE information before making a final investment decision.

Key Takeaways at a Glance

A bi-directional net meter records two primary numbers: Import kWh (power drawn from KSEB) and Export kWh (excess solar sent to grid).
Net Billed Units = Import Units minus Export Units. If Export exceeds Import, surplus units are banked on your account.
Banked solar energy credits roll over from month to month throughout the financial settlement year (October 1 to September 30).
Solar eliminates high-slab variable energy charges, but mandatory fixed demand charges, meter rent, and electricity duty remain payable.
Homeowners who install appropriately sized systems reduce their variable KSEB energy charges to zero.

Table of Contents

What Does a Bi-Directional Net Meter Display?

Following solar plant commissioning, KSEB replaces your standard unidirectional meter with a computerized tri-vector / bi-directional meter. This meter automatically toggles across multiple LCD display registers.

—Register C1 (Active Import kWh): Cumulative electricity drawn from the KSEB grid during night hours and cloudy intervals.
—Register C2 (Active Export kWh): Cumulative excess clean solar electricity exported into the KSEB grid during peak daytime hours.
—Register C3 (Net kWh): The net difference between import and export over the billing cycle.
—Instantaneous Parameters: Voltage, current per phase, active load (kW), and power factor.

The KSEB Net Metering Calculation Formula

Under KSERC Renewable Energy regulations, billing is computed on a net basis at the end of each bi-monthly billing period.

Scenario A (Import > Export): If your household consumes 500 units from the grid and exports 350 units of solar, you are billed for only 150 net units (500 - 350 = 150 units). Because this falls into lower telescopic slabs, your bill drops drastically.

Scenario B (Export > Import): If your household consumes 400 units and exports 550 units, your net consumption is zero. The surplus 150 units are credited into your KSEB "Banked Energy Account" to offset future bills.

Real-World Bi-Monthly Bill Comparison for a 3 kW System in Kerala

Here is an actual billing comparison for a typical 3-bedroom home in Malappuram or Kozhikode with an average consumption of 600 units every two months.

Billing Parameter	Without Solar (Standard KSEB Bill)	With 3 kW On-Grid Solar Plant
Total Bi-Monthly Consumption	600 Units (kWh)	600 Units (kWh)
Solar Self-Consumption (Direct)	0 Units	~250 Units used directly during daytime
Grid Import (Night / Cloudy)	600 Units	350 Units drawn from grid
Solar Grid Export (Surplus)	0 Units	~420 Units exported to KSEB
Net Billed Energy Units	600 Units (Slab 5 / Non-Telescopic)	0 Net Units (Surplus 70 units banked)
Energy Charges Payable	₹4,300 – ₹4,800 approx.	₹0.00
Fixed Demand Charges + Meter Rent	₹220 – ₹280	₹220 – ₹280 (Mandatory fixed charge)
Total Bi-Monthly Payable Amount	₹4,520 – ₹5,080	₹240 – ₹310 (Over 90% Total Savings)

Annual Banking Period & Excess Energy Compensation

Under current KSERC regulations, the settlement cycle runs annually from October 1 to September 30. Any surplus banked energy remaining in your account at the end of the settlement year is compensated by KSEB at the average power purchase cost (APPC) determined by the commission.

Because compensation for excess units is lower than retail tariff savings, GSR Energies engineers advise sizing your residential system to offset 90% to 100% of your annual consumption rather than massively oversizing.

Kerala Rooftop Solar & KSEB Implementation Impact

How these regulations, technical specifications, and standards apply specifically to homes and commercial setups connected to the Kerala State Electricity Board (KSEBL) grid:

Protects Kerala households against bi-monthly telescopic tariff spikes where consumption exceeding 250 units incurs heavy rates.
Enables summer energy surpluses (February–May) to offset higher grid consumption during monsoon or festival periods.
Transforms residential rooftops into decentralized power generation assets that yield predictable economic returns for 25+ years.

Frequently Asked Questions

Will my KSEB electricity bill be literally ₹0.00 with solar?

No reputable solar company should promise a literal ₹0.00 bill. KSEB mandates nominal fixed connected load charges and electricity duty (typically ₹180 to ₹300 bi-monthly for domestic connections), even when net energy consumption is zero.

What happens to banked solar units during the monsoon season?

Banked credits accumulated during bright summer months (February through May) automatically offset higher grid imports during rainy monsoon months (June through August), keeping your bills low year-round.

Internal Solar Resources for Kerala