Gujarat Solar Calculator
Compare rooftop solar payback across Gujarat's state DISCOMs and Torrent Power, in some of India's strongest sunshine.
Updated · By Niraj Kumar · 1 source
https://checkpre.com/energy/solar-calculator-gujarat
Your home
About 352 units a month on the PGVCL tariff. Use a year's average if your bill swings with the seasons.
Fine-tune
Sized to cover a year of your consumption, at 5.8 peak sun hours a day in Gujarat.
About 100 sq ft per kW. Leave at 0 for no limit.
Typical for an on-grid system from an empanelled vendor. Replace it with your quote.
Indian residential tariffs have historically risen 4-7% a year.
Monocrystalline panels typically lose about 0.5% a year.
A 2.5 kW system makes about 340 units a month, 96% of your use. Your bill drops from ₹3,000 to about ₹117 in year one.
- Installed cost
- ₹1,50,000
- PM Surya Ghar subsidy
- − ₹69,000
- Net cost to you
- ₹81,000
- Saving in year one
- ₹34,670
- Return (IRR)
- 47.0% a year
- over 25 years, before tax
- CO₂ avoided
- 69 tonnes
- over 25 years
- You pay54%
- Central subsidy46%
Year-by-year cash flowShowHide
| Year | Units made | Bills without solar | Bills with solar | Upkeep and EMIs | Running total |
|---|---|---|---|---|---|
| 1 | 4,075 | ₹36,076 | ₹1,406 | ₹0 | -₹46,330 |
| 2 | 4,055 | ₹37,880 | ₹1,629 | ₹0 | -₹10,079 |
| 3 | 4,035 | ₹39,774 | ₹1,869 | ₹0 | ₹27,826 |
| 4 | 4,014 | ₹41,762 | ₹2,129 | ₹0 | ₹67,459 |
| 5 | 3,994 | ₹43,851 | ₹2,410 | ₹0 | ₹1,08,900 |
| 6 | 3,974 | ₹46,043 | ₹2,712 | ₹1,500 | ₹1,50,731 |
| 7 | 3,954 | ₹48,345 | ₹3,038 | ₹1,500 | ₹1,94,538 |
| 8 | 3,935 | ₹50,762 | ₹3,388 | ₹1,500 | ₹2,40,413 |
| 9 | 3,915 | ₹53,301 | ₹3,764 | ₹1,500 | ₹2,88,449 |
| 10 | 3,895 | ₹55,966 | ₹4,169 | ₹1,500 | ₹3,38,746 |
| 11 | 3,876 | ₹58,764 | ₹4,604 | ₹1,500 | ₹3,91,406 |
| 12 | 3,857 | ₹61,702 | ₹5,070 | ₹19,000 | ₹4,29,038 |
| 13 | 3,837 | ₹64,787 | ₹5,571 | ₹1,500 | ₹4,86,754 |
| 14 | 3,818 | ₹68,027 | ₹6,107 | ₹1,500 | ₹5,47,174 |
| 15 | 3,799 | ₹71,428 | ₹6,682 | ₹1,500 | ₹6,10,420 |
| 16 | 3,780 | ₹74,999 | ₹7,298 | ₹1,500 | ₹6,76,621 |
| 17 | 3,761 | ₹78,749 | ₹7,957 | ₹1,500 | ₹7,45,914 |
| 18 | 3,742 | ₹82,687 | ₹8,662 | ₹1,500 | ₹8,18,439 |
| 19 | 3,724 | ₹86,821 | ₹9,416 | ₹1,500 | ₹8,94,343 |
| 20 | 3,705 | ₹91,162 | ₹10,222 | ₹1,500 | ₹9,73,783 |
| 21 | 3,686 | ₹95,720 | ₹11,084 | ₹1,500 | ₹10,56,920 |
| 22 | 3,668 | ₹1,00,506 | ₹12,004 | ₹1,500 | ₹11,43,922 |
| 23 | 3,650 | ₹1,05,532 | ₹12,987 | ₹1,500 | ₹12,34,966 |
| 24 | 3,631 | ₹1,10,808 | ₹14,036 | ₹1,500 | ₹13,30,238 |
| 25 | 3,613 | ₹1,16,349 | ₹15,173 | ₹1,500 | ₹14,29,914 |
How is rooftop solar payback worked out in Gujarat?
Saving₍y₎ = [Bill(U) − Bill(U − G₍y₎/12)] × 12 × (1 + e)^(y−1), G₍y₎ = kW × H × 365 × PR × (1 − d)^(y−1)This page uses the same method as the Solar ROI Calculator India, which explains each term and assumption in full.
| DISCOM | 100 units | 200 units | 300 units | 500 units |
|---|---|---|---|---|
| PGVCL | ₹768 | ₹1,607 | ₹2,507 | ₹4,428 |
| Torrent Power | ₹830 | ₹1,674 | ₹2,716 | ₹4,646 |
Worked example
A Rajkot home on PGVCL with a ₹2,500 monthly bill and a flat RCC roof, assuming prices rise 5% a year.
- 1Working the bill back through the PGVCL slabs, charges and duty gives about 300 units a month
- 2At 5.8 peak sun hours, 2 kW makes about 272 units a month, 91% of that use
- 32 kW at ₹60,000 per kW costs ₹1,20,000; PM Surya Ghar pays ₹60,000, leaving ₹60,000
- 4The first year saves ₹27,316, and the saving grows as tariffs rise
The system pays for itself in about 2.1 years and leaves the household about ₹11,27,996 ahead over 25 years.
Frequently asked questions
Why is Gujarat so good for rooftop solar?
Sunshine and adoption. Gujarat averages about 5.8 peak sun hours a day, so each kW makes around 1,600 units a year, and the state has the most rooftop installations under PM Surya Ghar, which keeps installed prices competitive.
Is Torrent Power cheaper than the state DISCOMs?
Slightly, for most homes. Torrent's Ahmedabad energy charges run from ₹3.20 to ₹5.00 a unit, against ₹3.05 to ₹5.20 on the state DISCOMs, but both add an FPPPA charge of over ₹3 and 15% duty, so the bill per unit is similar. The table shows the same consumption on each.
How does net metering settle in Gujarat?
Net metering with surplus units bought back by the DISCOM at the GERC rate at the end of each billing cycle.
Sources
Related calculators
- Rajkot Solar Calculator (PGVCL)Rooftop solar payback for Rajkot and Saurashtra on PGVCL, using Gujarat's strong sunshine, the FPPPA charge and 15% duty.
- Ahmedabad Solar Calculator (Torrent Power)Rooftop solar payback for Ahmedabad and Gandhinagar on Torrent Power, where crossing 200 units a month moves you to a dearer table.
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