How to Calculate Solar Payback in Pakistan in 2026
A simple step-by-step calculation you can do with a calculator and your last 12 months of electricity bills
By Asad Baig · Lahore · April 2026 · Approx. 5-min read
What you need to calculate solar payback
Three numbers and a calculator.
- Total installed cost of the solar system (panels + inverter + battery if hybrid + mounting + electrical work + NEPRA licensing + installer margin)
- Annual electricity savings (your current annual bill minus your projected annual bill after solar)
- Expected annual tariff inflation (a reasonable assumption is 8-12 percent based on recent Pakistani trends)
With these three numbers, you can calculate the simple payback period (cost divided by first-year savings) and the more accurate inflation-adjusted payback (which accounts for rising electricity costs over time).
This article walks through the calculation in plain English.
Step one: Total installed cost
Get a written quote from a reputable installer. The quote should include all components:
- Solar panels (kilowatt capacity, brand, manufacturer warranty period)
- Inverter (brand, warranty)
- Battery if hybrid (chemistry, capacity in kWh, cycle life specification)
- Mounting structures
- DC and AC electrical work
- Bidirectional meter (if grid-tied)
- NEPRA licensing application and fees
- Installation labour
- First year of monitoring service
Add it all up. That is your total installed cost.
For typical Pakistani 2026 prices:
- 5 kW grid-tied (no battery): Rs. 400,000-500,000
- 5 kW hybrid (5 kWh battery): Rs. 600,000-800,000
- 10 kW grid-tied: Rs. 800,000-1,000,000
- 10 kW hybrid (10 kWh battery): Rs. 1,200,000-1,500,000
Step two: Annual electricity savings
This requires three sub-calculations.
Current annual bill: Add up your last 12 months of electricity bills. This is the total you currently pay for grid electricity.
Projected annual bill after solar: Estimate based on your system size and consumption pattern. For a 10 kW hybrid system covering a household consuming 1,000 units per month with significant evening use:
- Solar will produce approximately 14,000-17,000 kWh per year (Pakistani solar resource is good)
- Most of this will be self-consumed (daytime use directly, evening use through battery)
- Small surplus may be exported at Rs. 11/unit (limited revenue under 2026 rules)
- Remaining grid imports (mostly nighttime backup, cloudy days, peak winter) will be a small amount, typically 10-20% of pre-solar consumption
- Plus you will continue to pay fixed monthly charges and capacity charges on the baseline grid connection
For the household example: pre-solar bill Rs. 30,000-40,000/month; post-solar bill Rs. 5,000-8,000/month.
Annual savings: Multiply monthly savings by 12.
For the example: monthly savings Rs. 22,000-32,000; annual savings Rs. 264,000-384,000.
Step three: Simple payback calculation
Simple payback = Total installed cost ÷ Annual savings.
For the example with a Rs. 1,200,000 installed cost and Rs. 300,000 annual savings:
Payback = 1,200,000 ÷ 300,000 = 4 years
This is a useful starting estimate but it is incomplete. It assumes your savings stay flat over time. In practice, electricity tariffs rise. Your annual savings rise correspondingly. Real payback is faster than simple payback.
THE SIMPLE FORMULA
Total installed cost ÷ Annual savings = Simple payback period in years.
For typical 10 kW hybrid in Pakistan in 2026: ~4-5 years simple payback. Inflation-adjusted: 3.5-4 years effective.
Step four: Inflation-adjusted payback
This is more accurate but requires an assumption about how fast tariffs will rise.
A reasonable assumption for Pakistani tariff inflation is 8-12 percent per year. This reflects the combination of:
- Rupee depreciation against the dollar (most fuel and capacity payments are dollar-indexed)
- IPP capacity payment growth
- Circular debt service costs flowing into tariffs
- Periodic NEPRA-approved tariff increases
If you assume 10 percent annual tariff inflation, your second-year savings will be about 10 percent higher than your first-year savings. Your third-year savings will be another 10 percent higher. And so on.
This compounding shortens the effective payback. A simple 4-year payback typically becomes a 3.5-year inflation-adjusted payback.
For the calculation:
- Year 1 savings: Rs. 300,000
- Year 2 savings: Rs. 330,000
- Year 3 savings: Rs. 363,000
- Year 4 savings: Rs. 399,300
- Cumulative through year 4: Rs. 1,392,300
System cost of Rs. 1,200,000 is exceeded somewhere in year 4 (specifically, around month 3.5 of year 4). Effective payback approximately 3.5 years.
How to verify your installer's payback estimate
Reputable installers will provide a payback estimate as part of their quote. Verify their assumptions.
Did they use 2026 net billing rates (Rs. 11/unit export, Rs. 48/unit import) or are they still using 2024 net metering assumptions? The latter inflates the payback estimate. Insist on 2026 assumptions.
What is their assumed kWh production per kW of installed capacity? Reasonable Pakistani assumption is 1,500-1,700 kWh per kWp per year. Some installers inflate this to 1,800-2,000. Be sceptical.
What is their assumed annual panel degradation? Standard is 0.5% per year. Some installers ignore degradation. Insist on the conservative assumption.
What is their assumed annual tariff inflation? A reasonable assumption is 8-12 percent. Some installers use 15-20 percent (which produces flattering payback estimates). Be sceptical of optimistic inflation assumptions.
If the installer's payback estimate uses optimistic assumptions on all four factors, the real payback may be 50-80 percent longer than they advertise. Insist on conservative assumptions and verify.
What you should take away
Three things.
Solar payback in Pakistan in 2026 for a typical household is 4-5 years simple, 3.5-4 years inflation-adjusted. Calculate your specific case using your actual bills and a reputable installer's quote.
Verify your installer's assumptions. They have an interest in showing the most favourable payback. You have an interest in seeing the realistic payback. The two should be reconciled.
Compare scenarios. What is your payback at conservative assumptions versus aggressive assumptions? The conservative scenario tells you the realistic case. The aggressive scenario tells you the upside if everything goes well.
For the comprehensive solar decision framework, see my pillar on solar in Pakistan in 2026.
Now you know how to calculate. Pass it on.
Thank you for reading.
, Asad Baig, Lahore, April 2026
Frequently asked questions
How do I calculate solar payback in Pakistan in 2026? Total installed cost divided by annual savings. For a typical 10 kW hybrid system: cost approximately Rs. 1,200,000, annual savings approximately Rs. 300,000, simple payback approximately 4 years. Inflation-adjusted payback approximately 3.5 years assuming 10% annual tariff inflation.
What kWh production should I expect from my Pakistani solar system? Approximately 1,500-1,700 kWh per kWp installed per year, depending on roof orientation, shade, and regional solar resource. Some installers quote 1,800-2,000 kWh/kWp; this is optimistic for most installations.
What is a reasonable annual tariff inflation assumption for payback calculations? 8 to 12 percent. This reflects rupee depreciation, IPP capacity payment growth, and circular debt service costs flowing into tariffs. Avoid installer payback estimates based on assumptions of 15-20% annual tariff inflation, which produce flattering but unreliable results.
Sources and notes
- NEPRA Prosumer Regulations 2026 and tariff history (nepra.org.pk)
- IRENA solar resource data for Pakistan
- Pakistan Solar Association installer pricing benchmarks
- BloombergNEF panel and battery price surveys
Related reading from Asad Baig
The pillar this answers under
Sibling long-tail explainers
- Should I Install Solar in Pakistan After the 2026 Rules?
- Is Solar Still Worth It in Pakistan in 2026?
- What Size Solar System Do I Need for My Pakistani Home?
- Solar With Battery vs Net Billing: Which Is Better in 2026?
Asad Baig