India Approves $4.2 Billion Desalination Program for Coastal Cities

India Approves $4.2 Billion Desalination Program for Coastal Cities

India's Union Cabinet approved a $4.2 billion national desalination initiative on December 15, 2025, authorizing construction of 12 large-scale reverse osmosis plants across seven coastal states. The program targets daily production of 2.8 billion liters of freshwater by 2030, enough to supply 25 million people.

The announcement follows Chennai's third major water crisis in six years and growing groundwater depletion across India's southern peninsula.

Plant Locations and Capacity

The largest facilities will be built in Chennai (450 million liters per day), Mumbai (400 MLD), and Visakhapatnam (300 MLD). Additional plants are planned for Gujarat, Kerala, Karnataka, and Odisha. Tamil Nadu, which has operated a 100 MLD desalination plant in Nemmeli since 2013, will serve as the technology benchmark.

Energy consumption targets of 3.2 kilowatt-hours per cubic meter represent a 25% improvement over India's existing desalination plants, achievable through energy recovery devices and membrane technology upgrades.

Cost and Financing

Desalinated water is expected to cost $0.60-0.80 per cubic meter, compared to $0.15-0.30 for conventional treated surface water. The government will subsidize 40% of production costs during the initial five-year operating period to keep consumer tariffs affordable.

"Desalination is expensive, but water scarcity is more expensive," said Mihir Shah, chairman of the India Water Foundation. "Chennai's 2019 water crisis cost the city an estimated $800 million in economic losses."

Energy Integration

Each desalination plant will incorporate dedicated solar power installations to offset 50-70% of energy consumption. The Chennai plant will be paired with a 200 MW solar farm on adjacent government land, reducing both operating costs and carbon footprint.

Israel's IDE Technologies and Singapore's Hyflux have been shortlisted for engineering, procurement, and construction contracts, bringing experience from established desalination markets.

Environmental Mitigation

Brine discharge, which can harm marine ecosystems, will be managed through dilution systems and offshore diffuser pipes extending 1.5 kilometers from shore. Environmental impact assessments require brine salinity to return to ambient levels within 100 meters of discharge points.

The program complements India's Jal Jeevan Mission, which has connected 120 million rural households to piped water since 2019 and is now pivoting to address urban water security.