Tata Power Solar, Roofsol Energy, Mahindra Solarize, Kalpa Power, and HARTEK emerged as the top rooftop solar installers in India in 2025, according to Mercom India’s India Solar Market Leaderboard 2026. Together, these five companies accounted for nearly 23.6% of the total rooftop solar market. India added 7.1 GW of rooftop solar capacity in 2025, marking an 123.3% increase from 3.2 GW in 2024, as per Mercom India’s Q4 & Annual 2025 Mercom India Rooftop Solar Market Report.