Your effective per-unit electricity cost — the all-in rate including GST, FPA, and fixed charges — is the most important number for calculating solar ROI and comparing energy efficiency measures. This calculator derives your true per-unit rate from your actual total bill amount and units consumed.
How to use: Enter the total bill amount (the exact figure you need to pay, including all taxes and charges) and the units consumed for the same month. Both figures appear on your DISCO bill — the units in the meter reading section and the total in the 'Amount Payable' row.
Find your effective per-unit electricity cost from your actual bill — useful for solar ROI and appliance cost calculations.
The all-in per-unit rate (including GST, FPA, and fixed charges) is the most accurate figure for calculating savings from solar or other energy efficiency measures.
Using Your Effective Rate
This all-in rate is what you should use for any solar savings calculation, appliance cost calculation, or energy efficiency decision. The rate is higher than the published tariff slab because it includes taxes, surcharges, and fixed charges spread across your consumed units. Most urban Pakistani consumers in the 300–500 unit range pay an effective all-in rate of Rs. 35–50 per unit.
Frequently Asked Questions
The NEPRA tariff is the energy charge only — the base rate for electricity consumed in each slab. Your effective rate adds GST (17%), FPA (variable monthly), Neelum Jhelum surcharge, TV licence, and DISCO fixed charges — all spread across your units consumed. These additions typically add Rs. 10–20 per unit to the base tariff rate.
A high effective rate often means you've crossed into a higher slab (the 300-unit protected/non-protected threshold is the biggest jump), or the FPA for this month was particularly high. Compare with last month's effective rate to identify the trend.