India installs record 36.6 GW of solar capacity in 2025

Annual additions rise 43% YoY.

India installed a record 36.6 gigawatts (GW) of solar capacity in 2025, up 43% from 25.6 GW in 2024, according to a report by Mercom India.

Large-scale projects accounted for about 81% of total additions, or roughly 29.5 GW, whilst rooftop solar installations contributed over 19% of the new capacity.

In the fourth quarter (Q4) alone, India added 9.9 GW of solar capacity, an increase of nearly 11% from the previous quarter and about 21% higher than the same period a year earlier.

Rajasthan, Gujarat, and Maharashtra led large-scale solar installations, accounting for approximately 34%, 28%, and 15% of total additions, respectively.

As of December 2025, India’s cumulative installed solar capacity stood at nearly 136 GW, with large-scale projects making up about 85% and rooftop systems accounting for around 15%.

Mercom India said grid transmission constraints and curtailment in solar-heavy states remain key challenges, while equipment delays and regulatory compliance requirements could contribute to uneven growth in 2026.