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Net Billing Calculator
For homes that already have a green meter. Imports billed at the full tariff; exports credited in rupees — the way the February 2026 regulations actually work, not the way the old net metering did.
The check example: import 320 units, export 450, 3 kW load — gross payable Rs 16,273.32, export credit Rs 3,658.50 at Rs 8.13, net payable Rs 12,614.82. Export more than the bill (import 150, export 900) and the payable is zero with a carry-forward credit of Rs 626.98 — never a negative bill.
Net billing calculator — your green-meter bill
Under net billing, imports are billed at the full tariff and exports are credited in rupees. The two are never netted unit-for-unit.
From the green meter: register #8 (off-peak import) + register #6 (peak import).
Register #5 on the green meter.
The regulations name the National Average Energy Purchase Price (NAEPP) without printing a rupee value. Rs 8.13 per unit is the NEPRA CY2026 NAEPP decision figure; about Rs 11 was reported at notification (Dawn, 10 February 2026). Verify against your DISCO agreement or bill — and edit the figure here to match.
Net billing is not net metering with a new name
Under the repealed net metering, an exported unit cancelled an imported unit — solar owners effectively banked units with the grid at the retail rate. Net billing (S.R.O. 251(I)/2026, effective 9 February 2026) separates the two flows: imports are priced at the full retail tariff, exports are bought at the average energy purchase price. For most homes that makes a self-consumed unit worth roughly four times an exported one — which is why the payback calculator values them separately, and why any page still promising 1:1 offset for a new connection is describing a regime that ended in February 2026. Existing owners keep their terms until expiry under S.R.O. 547(I)/2026 — the regime-change guide sets out who keeps what.
Questions
How does net billing work?
Units you import are billed at the full tariff — slabs, fixed charge, adjustments, GST — exactly as if you had no panels. Units you export are credited in rupees at the export rate. The credit is subtracted from the bill; if it is larger, the balance carries forward. Imports and exports are never netted unit-for-unit.
What is the export rate?
The regulations credit exports at the National Average Energy Purchase Price (NAEPP) without printing a rupee figure. The best-sourced value is Rs 8.13 per unit, the NEPRA CY2026 NAEPP decision figure; about Rs 11 was reported when the regulations were notified. The calculator defaults to Rs 8.13 and expects you to overwrite it with the rate on your own agreement or bill.
I had net metering before February 2026. What happens to me?
Your agreement continues at the repealed rate and mechanism until its term expires (Amendment S.R.O. 547(I)/2026) — unless you materially modify the system, such as adding panels or a larger inverter, which voids the saving. Renewals after expiry fall under net billing. The legacy view in the calculator shows the old arithmetic with that condition attached.
Which meter registers do I read?
On a green (bidirectional) meter: register #8 is off-peak import, #6 is peak import, and #5 is export. The calculator accepts the registers directly and adds the imports for you.