Can ‘floating’ solar boost India’s renewable energy uptake? | Explained

The Pradhan Mantri Surya Sarovar Yojana significantly contributes to India's climate commitments, including the Panchamrit goals of achieving 500 GW of non-fossil capacity by 2030 and net-zero emissions by 2070. By shifting solar installations from land to water, Floating Solar Photovoltaic (FSPV) mitigates the critical bottleneck of land scarcity, which often leads to conflicts over land use changes, agricultural displacement, and deforestation. Furthermore, FSPV offers dual environmental benefits: the water cools the panels, thereby increasing energy yield, while the panels shade the water, reducing evaporation and algae growth in reservoirs. However, the deployment of FSPV must be carefully managed to address potential ecological impacts on water bodies, necessitating the comprehensive ecological studies funded by the scheme.

The scheme introduces a strategic shift in India's renewable energy deployment by mandating a paired energy storage system (at least two hours) for every project. This addresses the persistent curtailment problem—where solar power is intentionally suppressed due to lack of storage to keep the grid stable during periods of high generation and low demand. By storing midday solar generation for evening peak demand, the scheme enhances grid reliability and economic efficiency. Although FSPV and mandatory storage entail higher capital costs (approximately 25% more than ground-mounted systems plus storage costs), the Central Financial Assistance (CFA) provided under the scheme aims to de-risk these investments. The scheme is expected to attract substantial private investment (₹28,500 crore) and generate significant employment, fostering a robust domestic manufacturing and servicing ecosystem for FSPV technologies.

The PM-SSY employs a targeted governance approach to promote decentralized solar deployment, particularly benefiting states that lack abundant land for renewables but possess large reservoirs (e.g., Maharashtra, Madhya Pradesh). To overcome the hesitation of State Governments unfamiliar with FSPV technology, the Centre offers upfront financial support for essential pre-feasibility studies, including bathymetry (measurement of water depth), hydrography, and ecological impact assessments. By absorbing these initial technical and financial risks, the Ministry of New and Renewable Energy aims to lower the barrier to entry, encouraging broader state participation. The involvement of Solar Energy Corporation of India as the implementing agency ensures standardized procurement and execution, critical for scaling a relatively nascent technology in India.