Solar Payback Period in Gujarat 2026, Worked Out for Homes and Shops

Solar payback in Gujarat is the number of years it takes for your bill savings to add up to what you paid for the system. For a subsidised 3.3 kWp home system in Bharuch, that is about 2 to 3 years at ₹8 a unit. For a shop or factory with no subsidy it is about 4 years. This post shows the working, so you can redo it with your own bill.

The simple formula

Payback in years is your net cost divided by your yearly saving.

Net cost is the installed price minus any subsidy. Yearly saving is the units the system makes in a year, multiplied by what each unit would have cost you on the bill. That is all. Everything else in this post is about getting those two numbers right.

A home example, 3.3 kWp

Item	Figure
Installed price	₹1,65,000
PM Surya Ghar subsidy	₹78,000
Your net cost	₹87,000
Units per month, Bharuch average	about 420
First-year saving, from our calculator	about ₹3,105 a month, ₹37,260 a year
Simple payback	about 2.3 years

Our calculator also adds a 5% yearly rise in tariff and a 0.5% yearly drop in panel output. The two roughly cancel in the first few years, so the simple figure is close to the calculator’s.

Why your number may be longer

The ₹8 per unit figure is the problem for many homes. DGVCL residential tariffs are slabbed, so the first units each month cost less than the last ones. If your bill is ₹1,500, the units solar removes are mostly cheap ones, and each is worth less than ₹8 to you. A ₹1,500 bill home should expect 3 to 5 years, not 2.

The second reason is oversizing. Units you use yourself save the full tariff. Surplus units left at the end of the settlement period are credited at a much lower rate, which our model takes as ₹2.25. A 5.5 kWp system on a home that only needs 3.3 kWp spends a lot of its output earning ₹2.25 instead of ₹8.

The third is a battery. A hybrid system with batteries costs more for the same generation. Batteries buy backup during power cuts, and that is worth paying for if cuts hurt you, but they do not add savings on a net metered home.

A shop example, 9.9 kWp

A shop with a ₹10,000 monthly bill needs about 9.9 kWp. At ₹50,000 per kWp that is about ₹4.95 lakh, with no central subsidy. The system makes around 1,250 units a month, worth about ₹10,000 at ₹8. Simple payback is a little over 4 years.

Two things usually bring it down. Commercial tariffs in Gujarat are often higher than ₹8 once fixed and demand charges are counted, and a business can usually claim accelerated depreciation on solar. Ask your CA for the current rate before you plan around it. The post on solar for shops in Bharuch has more.

Check your own figure

Take your last twelve DGVCL bills, add the units, and divide by twelve. Divide that by 126, which is 4.2 units a day for 30 days, and you have the kWp you need. Multiply by ₹50,000, take off the subsidy if you are a home, and divide by what those units cost you in a year. Or put your bill into our savings calculator and it does the same sum.

If your answer looks too good, the usual cause is using ₹8 per unit for a small bill. If it looks too long, check that the system is not sized bigger than your use. The post on what size solar system your home needs walks through sizing.