India has a solar opportunity hiding in plain water

India's Union Cabinet has approved the PM Surya Sarovar Yojana (PM-SSY), which allocates ₹5,070 crore to develop 5,000 MW of floating solar projects with 10,000 MWh of co-located energy storage. This initiative goes beyond its stated capacity, highlighting a broader opportunity: India may not need additional land for future solar capacity if it repurposes existing water infrastructure.

According to the National Institute of Solar Energy's (NISE) 2026 assessment, India has a floating-solar potential of 102.18 GWp across 4,546 sq km of technically suitable water-body areas. Rajasthan, Gujarat, and Tamil Nadu have built their early solar capacities on large, contiguous parcels of relatively inexpensive land, an advantage not available to other states.

Floating solar overcomes the land challenge by utilizing the surfaces of existing reservoirs, irrigation tanks, and industrial ponds for a second purpose without disrupting their primary use. States like Maharashtra and Madhya Pradesh account for more than 30 GWp of potential floating-solar capacity, leading the national estimate.

However, floating solar faces challenges such as higher upfront capital costs, ecological concerns, lack of technical standards, and coordination with various authorities involved in irrigation and water management. Despite these challenges, floating solar can enhance generation through water-cooling, which can boost output by 2% to over 8%, and reduce evaporation by 30-60%, benefiting water-stressed regions and thermal power plants reliant on captive reservoirs.

The PM-SSY aims to address these challenges by establishing a single-window clearance mechanism for multiple authorities governing the same water body, streamlining project pipelines, and setting predictable timelines. With India having assessed a potential of 102.18 GWp but only 700 MW of floating-solar capacity installed, the opportunity lies not just in the technology but in overcoming regulatory and coordination hurdles.