Indian rooftop solar startup SolarSquare is closing in on a new funding round that could more than double its valuation in just 18 months. The Mumbai-based company is in advanced talks to raise $55 million to $60 million, with a deal that would value it at $450 million to $500 million, as India’s push for household solar power keeps attracting capital.
That kind of jump is not happening in a vacuum. India’s solar market has been expanding fast thanks to subsidies, rising electricity demand, and a government target of 500 GW of renewable capacity by 2030, with more than half of that expected from solar. For startups selling to homes and apartment blocks, the combination is a rare mix of policy support and real consumer pull.
Lightspeed returns through its growth fund
Lightspeed, which led SolarSquare’s $40 million Series B round in December 2024 at a $200 million valuation, is expected to back the company again, this time via its growth fund. Existing investor Elevation Capital is also set to participate, and the round is expected to close next month.
The structure tells you where the opportunity is. Early-stage bets on Indian energy tech are giving way to larger growth rounds as the winners start to look less like experiments and more like infrastructure businesses with repeatable demand.
A fragmented rooftop solar market
SolarSquare, founded in 2015, sells and installs rooftop solar systems for private homes, residential complexes, and businesses. It is trying to play platform in a market still dominated by small local installers and distribution channels tied to component makers, which is usually code for ”messy, price-sensitive and full of room for consolidation.”
According to the company, it operates in 29 cities across 9 states and has installed more than 150 MW of projects. Sources say it has supplied clean power to nearly 50,000 homes and about 400 housing complexes, while also building rooftop systems for large technology companies.
Why the company is leaning into homes
Management has deliberately reduced exposure to lower-margin industrial projects and pushed harder into residential installations, which now generate most of its revenue. That is a sensible move in a market where household adoption is being helped along by subsidies and by the simple fact that rooftop solar is becoming more mainstream than exotic.
SolarSquare says its residential annual recurring revenue has crossed 10 billion rupees, or about $104 million, and its target for this year is to expand its home solar portfolio to 200 MW. If it gets there, the company will have more than scale on its side: it will have proof that Indian homeowners are starting to buy solar the way they buy broadband, not the way they buy a science project.
What the next round will test
The bigger question is whether SolarSquare can keep growing without slipping into the trap that catches many hardware-heavy startups: solid demand, ugly execution. The next phase will likely be about margins, installation speed, and whether it can defend share as rivals, from local contractors to better-funded clean-tech players, come hunting for the same households.