IN Brief:
- India added 2.7GW of rooftop solar capacity in the first quarter of 2026.
- The residential segment accounted for 82 percent of quarterly rooftop solar additions.
- Rooftop growth is shifting attention towards approvals, installer capacity, DISCOM coordination, and grid readiness.
Mercom India Research has reported that India added 2.7GW of rooftop solar capacity in the first quarter of 2026, up from 2.2GW in the final quarter of 2025 and 1.2GW in the first quarter of 2025.
The residential segment accounted for 82 percent of quarterly installations, supported by the PM Surya Ghar programme, subsidy-backed systems, simplified approvals, and state-level implementation support. Industrial, commercial, and government installations accounted for 11 percent, seven percent, and 0.4 percent of quarterly additions respectively.
Installations under the capital expenditure model accounted for 81 percent of the quarter’s additions, while operational expenditure and RESCO models represented around 19 percent. Cumulative rooftop solar installations reached 23.5GW at the end of March 2026.
Maharashtra, Uttar Pradesh, and Gujarat led rooftop solar additions during the quarter, accounting for 17 percent, 16 percent, and 15 percent of installations respectively. Gujarat, Maharashtra, and Uttar Pradesh also remained the leading states for cumulative rooftop solar capacity, representing 24 percent, 16 percent, and nine percent of total installations.
Rooftop solar accounted for 18 percent of India’s total solar installations during the quarter. Tendering activity was more mixed: 482MW of rooftop solar tenders were issued in Q1 2026, down more than 38 percent quarter-on-quarter but up nearly 32 percent year-on-year. Auctioned rooftop capacity reached 269MW, down 67 percent from the previous quarter.
Raj Prabhu, CEO of Mercom Capital Group, said: “The rooftop solar market maintained strong momentum in Q1 2026, with installations increasing 25% quarter-over-quarter and 125% year-over-year, driven primarily by robust residential demand under the PM Surya Ghar program.”
The scale of residential uptake places new pressure on execution. Subsidies and consumer demand can lift installation numbers quickly, but distributed generation has to be absorbed by real networks, real installers, and real approval systems. Faster approvals, financing access, installation quality, DISCOM coordination, metering, inspection, and grid readiness will determine how quickly the residential segment can continue to scale.
The same technical pressures are visible in mature rooftop markets. UK solar has passed two million installations, with total capacity reaching 22.1GW by the end of March 2026. In both markets, headline deployment figures sit on top of a more detailed engineering challenge involving voltage management, export limits, installer competence, metering, smart inverters, and distribution network capacity.
India’s pace is sharper because policy support is driving high-volume residential deployment. That creates a large opportunity for installers, inverter manufacturers, module suppliers, mounting-system providers, metering companies, and software platforms. It also increases the need for quality assurance. Poor installation practices, weak consumer advice, slow utility coordination, or inadequate aftercare can damage confidence in a market that depends on repeatable volume delivery.
Rooftop solar also changes how distribution systems behave. Higher residential penetration can create local reverse power flows, voltage rise, phase imbalance, and transformer loading issues during periods of strong generation and low demand. Those conditions can be managed, but they require better visibility, more active network operation, and technical standards that keep pace with deployment.
Storage is likely to become more important as rooftop capacity rises. Batteries can increase self-consumption, reduce export peaks, and support evening demand, although their economics depend on tariffs, subsidy design, battery pricing, and the reliability of grid supply. Smart inverters, time-of-use signals, and demand response can also help align generation with system needs.
The concentration of cumulative capacity in the top 10 states, which account for 80 percent of installations, shows that deployment remains uneven. States with stronger implementation, utility coordination, consumer awareness, and installer ecosystems are better placed to capture growth. States with slower processes may struggle even where rooftop potential is high.
India’s first-quarter figures show that rooftop solar can scale rapidly when policy, subsidy, and consumer demand align. The next test is how well those systems are installed, connected, monitored, and integrated into distribution networks that were not originally designed around millions of small generators.
