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Solar & Subsidy · 7 min read

Net Metering vs Net Billing vs Gross Metering — India 2026

2026-04-22

ଗାଇଡ୍ ଲେଖା ଇଂରାଜୀରେ ଉପଲବ୍ଧ। ଆପଣଙ୍କ ଭାଷାରେ ସାରାଂଶ ଉପରେ ଦେଖାଯାଇଛି।

If you're installing rooftop solar in 2026, the single most important question — bigger than panel brand or inverter type — is how your DISCOM settles your exported energy. The three regimes look similar on paper, but the payback difference can easily be 2 years.

The three regimes

  • Net metering: Your meter runs backwards when you export. You pay only for the net (import − export) units in a billing cycle. Surplus at year-end is forfeited (or paid at APPC rate).
  • Net billing: Import and export are metered separately. Import is charged at full retail tariff; export is credited at a lower, regulator-fixed rate (typically ₹2.50–3.50/unit in 2026).
  • Gross metering: 100% of solar generation is exported to the grid at a fixed feed-in tariff. You pay the full retail tariff for everything you consume. This is essentially a power-purchase agreement with the DISCOM.

2026 state-by-state status

  • Net metering (best for consumer): Maharashtra, Gujarat, Rajasthan, Tamil Nadu, Punjab, Haryana, West Bengal — available for residential up to 500 kW.
  • Net billing: Karnataka (above 10 kW), Andhra Pradesh, Kerala (above 3 kW).
  • Gross metering: Uttar Pradesh (mandatory above 10 kW), some discoms in Bihar.

Under PM Surya Ghar Muft Bijli Yojana, all residential systems below 10 kW must be offered net metering — this was the crucial policy shift of 2024.

The money difference, illustrated

Take a 5 kW system generating 600 units/month in a house consuming 400 units/month. Export = 200 units. Retail tariff = ₹8/unit; feed-in rate = ₹3/unit.

  • Net metering: Bill = 0 × ₹8 + 200 units credit carried forward. Annual saving ≈ ₹57,600.
  • Net billing: Bill = 400 × ₹8 − 200 × ₹3 = ₹3,200 − ₹600 = ₹2,600 payable. Annual net cost ≈ ₹31,200. Saving vs no-solar ≈ ₹26,400.
  • Gross metering: Bill = 400 × ₹8 − 600 × ₹3 = ₹3,200 − ₹1,800 = ₹1,400 payable. Annual net cost ≈ ₹16,800. Saving ≈ ₹21,600.

The same hardware, three different answers. Net metering pays back in ~3.5 years; gross metering in ~6–7 years.

Year-end true-up

Under net metering, if you generate more than you consume over a full year, most states pay for the surplus at the Average Pooled Power Purchase Cost (APPC) — typically ₹3.50–4.20/unit in 2026. Don't oversize your system expecting full retail rates on surplus.

Model your own payback with state, tariff, and roof area in our rooftop solar calculator.

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