Why rooftop solar is the smartest financial decision an Indian household can make in 2026
A founder's view on the economics — payback periods, real-asset returns and why solar is a better deposit than a fixed deposit.
I'll say something unfashionable up front: most Indian household financial advice is bad. It is built around tax-deferred long-horizon equity products that have done well in a unique 15-year bull market, and is almost completely silent on the most attractive risk-adjusted real-asset return available to an Indian homeowner today — a rooftop solar system. Let me walk through the actual numbers as I see them from running Sahayog Energy.
The deposit comparison
Put ₹1 lakh in a one-year bank fixed deposit at 7%. After 12 months you have ₹1,07,000. Subtract 30% slab tax on the interest and you net ₹1,04,900. Real return after India's CPI inflation (which is running around 5%)? Roughly zero in real terms. The fixed deposit is, charitably, a way to preserve capital — not grow it.
Put ₹1.6 lakh into a 3 kW rooftop solar system. Take the ₹78,000 PM Surya Ghar subsidy. Your net is ~₹82,000. The system saves you roughly ₹29,000 per year in electricity bills, year one. That's a 35% first-year cash yield. Untaxed. Inflation-protected (because tariffs rise with inflation, your savings rise with them). For the next 25 years.
The mutual-fund comparison
An equity mutual fund SIP, run honestly across the cycle, returns roughly 11–13% CAGR over 10–15 years. That's a good number — but it carries equity-market drawdown risk, requires you to stay invested through pain, and gets taxed (10% LTCG above ₹1 lakh per year).
Solar's IRR — calculated honestly across 25 years on the post-subsidy investment — works out to 22–28% depending on your tariff bracket, latitude and self-consumption ratio. The risk profile is also entirely different: no market volatility, no fund-manager dependence, no need for behavioural discipline. The risk is hardware risk (does the system perform?) — which is contracted away through warranties.
What the conventional advice gets wrong
The conventional financial-advisor framing treats solar as a 'home improvement' — an expense bucket — instead of an investment. That framing is two decades out of date. With the current subsidy structure and 2026 tariffs, solar belongs squarely in the asset allocation conversation, not the home-improvement one.
The objection I hear most often is 'but what if I sell the house?' Two answers. First, you typically can. A solar system is a transferable real asset; the net-metering connection moves with the property and the buyer inherits the savings. Second, even if the residual value were zero on sale, the system pays back in 3–4 years. After that, every year of ownership is pure savings. Most households stay in a home for longer than that.
The mistake that kills the return
I'll repeat this from every angle because it's the only thing that actually matters: the wrong installer destroys the return. The math above assumes a system that performs at 80%+ of nameplate after 25 years. Tier-1 modules from Trina, Jinko, Adani, Tata or Waaree do this. Tier-3 imports from grey-market vendors do not. The installer who quotes 30% below market is solving an equation by sacrificing the only variable that matters — the asset's longevity.
If you take one thing away from this piece: rooftop solar is a 25-year asset, not a one-year transaction. Buy it like an asset, not like a phone.
How to start
Look at your last 12 months of electricity bills, average the units per month, multiply by 0.7 to get the right capacity in kW. Get three quotes from DISCOM-empanelled installers. Ask each of them: which modules, which inverter, which mounting, what AMC. Compare. Pick.
If you're in Gujarat — Rajkot, Ahmedabad, Surat, Vadodara, Jamnagar, Bhavnagar, Junagadh, Mehsana — Sahayog Energy does this conversation hundreds of times a month. We're happy to be one of your three quotes. info@vijaygalani.com or sahayogenergy.com.
Got a question on what you've just read — or a project that touches one of the categories above? Write directly to the office.
First-generation Indian industrialist. Founder of Sahayog Energy and a group of ventures spanning solar, manufacturing, agri-inputs and trading.