Solar Net Billing Calculator Pakistan
See whether solar is still worth it for your home under current net-billing (prosumer) rules. Enter your usage and a system size, edit the assumptions to match your quote, and get an estimated payback period and savings.
Solar lagana faida-mand hai ya nahi — apne bill aur system size ke hisaab se andaza lagaiye.
Last updated: 16 June 2026
From your electricity bill — units used per month.
Assumptions — edit to match your quote (reviewed 2026-06-16)
Installed cost per kW. Total ≈ size × this.
Share of solar output you use directly during the day. Higher = better savings.
What you pay the grid per unit.
Net-billing buy-back rate — usually well below the import rate. Verify with NEPRA/DISCO.
Charges still payable on a grid connection.
Batteries add cost but improve evening self-consumption and backup.
Solar savings estimate
Your inputs are calculated in your browser and are not stored by CalcuPK.
Recommendation: Good fit
Short payback and strong daytime self-consumption — solar looks worthwhile on these assumptions.
| Item | Amount |
|---|---|
| Solar generation | 840 units |
| Self-consumed | 462 units |
| Exported to grid | 378 units |
| Value of self-consumed | PKR 27,720 |
| Export credit | PKR 10,206 |
| Old monthly bill | PKR 37,000 |
Formula & how it works
The calculator separates what you self-consume from what you export, because under net billing these are worth different amounts:
- Self-consumed units are valued at your import rate (you avoid paying it).
- Exported units are credited at the lower export / buy-back rate.
- New bill = remaining imported units × import rate − export credit + fixed charges.
- Payback = total cost ÷ annual savings (net of maintenance).
This is why self-consumption matters more than exporting: avoiding a unit you pay 60 PKR for is worth far more than exporting one at around 27 PKR.
Example calculations
Example: a 7 kW system at PKR 150,000/kW (~PKR 1,050,000) generating around 840 units a month, with strong daytime self-consumption, can cut a large share of a 600-unit bill. Because exported units are bought back well below the import rate, a household that uses most of its solar during the day reaches break-even years sooner than one that exports most of it.
Net Billing vs Net Metering in Pakistan
Older net metering effectively netted exported and imported units at the same tariff. Net billing separates the two: you are billed for imports at the full tariff but paid for exports at a lower notified buy-back rate. The practical effect is that the value of a solar system now depends heavily on how much electricity you can use while the sun is up. A household that runs ACs, pumps and appliances during the day captures most of the benefit; one that mostly uses power in the evening exports more and saves less, unless it adds a battery.
What to verify before buying solar
Treat every default here as editable. Confirm your import tariff, the current export rate with NEPRAand your DISCO, real installed cost per kW from multiple quotes, and realistic generation for your city. Then re-check the payback before committing.