Green Energy Projects in Coastal Bengal: The Sundarbans Paradox and the Solar Surge

There is a particular cruelty to West Bengal's coastal geography. The Sundarbans — 4,264 sq km of mangrove forest shared between India and Bangladesh, home to 4.5 million people and the world's largest population of Bengal tigers — is one of the planet's most climate-vulnerable regions. Sea level rise projections for the Bay of Bengal under IPCC AR6 scenarios put average annual inundation increases at 3.2 mm per year, and the data from the last decade suggests the reality is tracking above that. Islands like Ghoramara and Lohachara have lost over 40% of their landmass to tidal erosion since 1975.

And yet, this same coastline — 210 km of it, among the highest solar irradiance zones east of Rajasthan, and with consistent offshore wind speeds of 7-8 m/s at 100-metre hub heights — represents one of the most promising green energy geographies in eastern India. The paradox is not comfortable, but it is actionable: build the clean energy capacity that reduces the global emissions driving the climate threat, while simultaneously using that energy to power the adaptation measures that protect the communities already bearing its cost.

Solar in West Bengal: A State That Moved Slower Than It Should Have

Let's be direct: West Bengal was a laggard in utility-scale solar adoption compared to Rajasthan, Gujarat, and Tamil Nadu. The state's total installed solar capacity stood at approximately 1,050 MW as of March 2025 — a number that has doubled in two years, but which still represents only 7% of peak demand, against a national average contribution of 17%. The WBSEDCL (West Bengal State Electricity Distribution Company Limited) has had a complex relationship with solar procurement — state auction pipelines moved slowly through 2019-2022, and private sector project development faced land acquisition challenges on the Gangetic plains.

The West Bengal Renewable Energy Development Agency (WBREDA) has reset its solar target to 5,000 MW by 2030, underpinned by three specific programmes: the Rs 1,600 crore Ultra Mega Solar Park at Salboni (Paschim Medinipur) — 1,000 MW capacity, first phase under construction; a statewide Rooftop Solar Mission targeting 500 MW of residential and commercial installations under the PM Surya Ghar scheme, which has received 2.8 lakh applications in West Bengal in its first year; and a Floating Solar Programme targeting 300 MW across irrigation reservoirs in Bankura, Purulia, and Birbhum districts, with 45 MW already commissioned.

The Offshore Wind Opportunity: Eastern India's Untapped Frontier

If solar is the near-term story, offshore wind is West Bengal's longer-term energy prize. The Ministry of New and Renewable Energy (MNRE) has identified the shallow coastal waters off Digha, Shankarpur, and the Sundarban delta as one of India's four priority offshore wind development zones — alongside Gujarat, Tamil Nadu, and Odisha. The identified potential: approximately 8,000 MW of offshore wind capacity within India's EEZ along the Bengal coast.

The National Institute of Wind Energy (NIWE) published detailed wind resource assessments for the Bengal coast in December 2023, confirming average wind speeds of 7.2 m/s at 100m hub height and 8.1 m/s at 150m — commercially viable thresholds for fixed-foundation offshore turbines in 20-40m water depths. The first development zone, a 2,000 MW block off Digha, has been earmarked for auction under MNRE's Offshore Wind Leasing Policy (2024), with the bid process expected to launch in 2025-26.

The economic case is compelling. Offshore wind capital costs in India are projected to fall from the current Rs 10-11 crore per MW to Rs 7-8 crore per MW by 2027 as domestic turbine manufacturing scales up. Suzlon, Inox Wind, and Adani Green's turbine subsidiary have all indicated interest in Bengali coastal projects, attracted by the combination of port infrastructure at Haldia (for component staging) and grid connectivity through the PGCIL's eastern region high-capacity transmission network.

"West Bengal's coastline has absorbed every cyclone the Bay of Bengal has thrown at it. Now it's finally being asked to harness that same energy — cleanly."

The Sundarbans: Micro-Grids as Survival Infrastructure

For the 54 inhabited islands of the Indian Sundarbans — where 1.2 million people live without grid connectivity or with connections so unreliable that WBSEDCL itself categorises them as 'special area supply' — solar micro-grids are not an energy policy preference. They are survival infrastructure.

The Sundarbans Solar Mission, funded through a combination of state budget (Rs 480 crore), central RDSS funds, and World Bank co-financing under the India Energy Access Programme, targets 100% reliable electricity access across all 54 islands by 2026. As of March 2025, 38 islands have operational solar micro-grids with battery storage — primarily lithium-ion systems supplied by Exide and Amara Raja — providing an average of 18 hours of reliable supply, up from 4-6 hours of erratic grid supply in 2021.

The impacts go beyond electricity access. WBREDA's 2024 monitoring report shows that cold storage for fish — the primary livelihood of Sundarbans communities — has become viable with reliable power, with 340 community cold storage units commissioned across the micro-grid islands. Fish wastage rates have dropped from 35% (pre-micro-grid) to 8%, translating to a Rs 420 crore annual economic gain for fishing households — a figure that dwarfs the infrastructure cost.

Green Hydrogen and the NRL Connection

While Assam's NRL is the lead player in Northeast green hydrogen, West Bengal has its own green hydrogen ambitions anchored in the Haldia industrial complex. BPCL's Haldia Refinery — which processes 7.5 MMTPA and consumes 120,000 tonnes of grey hydrogen annually — has signed an MoU with NTPC Green Energy and SBI for a demonstration green hydrogen project using offshore wind power as the primary electrolyser input. The demonstration unit (3 MT/day capacity) is at advanced DPR stage, with the MNRE green hydrogen mission providing 30% viability gap funding.

If successful, the Haldia green hydrogen pilot would be India's first industrial-scale green hydrogen project powered directly by offshore renewable energy — a proof-of-concept with global significance for coastal refinery decarbonisation.

Cyclone Remal and the Resilience Question

Cyclone Remal (May 2024), which made landfall on the Sundarbans coastline with sustained winds of 135 km/h, was the most damaging cyclone to hit West Bengal since Amphan in 2020. It damaged 280 MW of installed solar capacity across coastal districts, set back 14 micro-grid installations on Sundarbans islands by 6-18 months, and revealed the fragility of coastal renewable infrastructure to extreme weather events whose frequency is increasing.

The post-Remal rebuild has incorporated lessons: solar panel mounting systems are being upgraded to IEC 61215 cyclone-resistance standards (140 km/h rated), battery enclosures are being elevated above the 1-in-50-year flood line, and community training in emergency shutdown and restart procedures is now a mandatory component of all new micro-grid commissioning. These are not small adjustments. They are the difference between renewable energy infrastructure that survives Bengal's climate reality and infrastructure that gets swept away every five years.

"Every solar panel that survives a Sundarbans cyclone is a proof point that the energy transition and climate adaptation can be built from the same blueprint."

The 2030 Energy Roadmap in Summary

West Bengal's 2030 target of 10,000 MW of renewable energy capacity — 5,000 MW solar, 3,000 MW offshore and onshore wind, and 2,000 MW from small hydro and biomass — is ambitious but geometrically achievable if offshore wind auctions proceed on schedule and the Salboni solar park completes without further delay. The Sundarbans micro-grid mission, if it hits its 2026 target, will be one of the largest rural electrification achievements in independent India's history — delivered not by extending the grid, but by transcending it.

The coastal belt that has given Bengal its sorrows — floods, cyclones, displacement, loss — may yet give it something more durable: the energy backbone for a low-carbon economy that actually works for the people who live on it.