India’s Offshore Wind: The 4× REC Multiplier, the Coastal Aluminium Geography, and Why 2030 Is the Decisive Decade
India’s offshore wind policy framework — a 4× REC multiplier, ISTS waiver, and SECI auction pipeline — creates a renewable energy pathway for India’s coastal aluminium smelters that onshore solar and wind cannot match: 24-hour generation profile, no land acquisition requirement, and proximity to port-connected coastal industrial clusters. The question is whether the economics will be right by 2030.
Key Takeaways
- India’s National Offshore Wind Energy Policy, notified by MNRE in 2015, provides the regulatory framework for offshore wind development in India’s exclusive economic zone. MNRE and SECI have targeted 30 GW of offshore wind capacity by 2030 — up from virtually zero installed today. The target has been repeatedly deferred from 2022 to 2023 to 2025 and now to 2030, reflecting the challenges of offshore wind development in Indian conditions: deep water bathymetry in the western coastline (Gujarat and Maharashtra), cyclone exposure on the eastern coastline (Tamil Nadu and Andhra Pradesh), grid integration complexity, and the absence of a domestic offshore wind supply chain.
- CERC’s REC multiplier framework allocates a 4× multiplier to offshore wind generation — meaning that each MWh of offshore wind electricity generates four Renewable Energy Certificates rather than one. This multiplier is the most generous REC incentive in India’s RE policy framework, significantly exceeding the 3× multiplier for pumped hydro storage and the 1× rate for standard solar and onshore wind. The 4× multiplier recognises the higher capital cost of offshore wind development and effectively subsidises the technology’s early deployment phase through the REC market mechanism. For industrial consumers subject to RPO and RCO obligations, offshore wind RECs purchased from a developer provide four times the compliance value per unit of electricity compared to standard solar or onshore wind RECs.
- The coastal aluminium geography makes offshore wind uniquely relevant to India’s most carbon-intensive industrial sector. India’s largest aluminium smelters — Vedanta Jharsuguda (Odisha), NALCO Angul (Odisha), and Hindalco Hirakud (Odisha) — are all located within 100 to 200 km of the Odisha coastline. Offshore wind development in the Bay of Bengal off Odisha’s coast — where water depth is relatively shallow in the 50 to 150 km offshore band — could deliver round-the-clock renewable power to these smelters through a dedicated offshore-to-shore transmission corridor, potentially replacing a significant fraction of their coal captive power plant consumption with 24-hour renewable generation.
- The economics of offshore wind in India are currently unfavourable compared to onshore solar and wind. SECI’s first offshore wind tender — 1 GW awarded in 2024 — cleared at a tariff of approximately Rs 6.80 to 7.20 per unit, compared to onshore solar at Rs 2.50 to 3.00 per unit and onshore wind at Rs 3.00 to 3.50 per unit. The offshore premium of approximately Rs 3.50 to 4.00 per unit reflects higher equipment and installation costs, deeper water foundations, and the absence of an established Indian offshore wind supply chain. However, Indian offshore wind capex is projected to decline from approximately Rs 15 to 18 crore per MW today to approximately Rs 9 to 12 crore per MW by 2030 as the supply chain develops — bringing tariffs toward Rs 4.50 to 5.50 per unit, which would make offshore wind competitive for industrial consumers who value the 24-hour generation profile.
- The 24-hour generation profile is offshore wind’s most significant advantage for aluminium smelters. Onshore solar generates for approximately 5 to 6 hours per day at peak capacity; onshore wind generates for 7 to 10 hours per day in good wind zones. Aluminium smelting is a continuous 24-hour process that requires firm power — interrupting the electrolytic reduction process causes cell damage and significant production losses. Replacing coal CPP with solar or wind alone requires BESS storage that adds Rs 2 to 4 crore per MWh of storage capacity. Offshore wind’s capacity factor of 40 to 45 percent — significantly higher than Indian onshore solar at 22 to 25 percent — provides more hours of generation per unit of installed capacity, reducing the storage requirement for 24-hour firm power delivery.
- The policy gap that must be closed for offshore wind to serve coastal aluminium smelters directly is dedicated point-to-point transmission from offshore wind farms to industrial consumers. Current grid connectivity rules require all generation to connect to the state grid, making direct wheeling from an offshore wind farm to a captive industrial consumer technically possible but administratively complex. MNRE has identified the need for a dedicated offshore wind transmission corridor policy — analogous to the dedicated transmission lines used in ultra-mega power project frameworks — but has not yet notified such a framework. This gap is the primary regulatory obstacle to offshore wind serving India’s coastal aluminium clusters before 2030.
Offshore wind occupies a peculiar position in India’s renewable energy landscape: it is simultaneously the most richly incentivised technology in the REC framework and the most underdeveloped in terms of installed capacity. The 4× REC multiplier was designed in 2018 when offshore wind was considered a futuristic, high-cost technology that required exceptional incentivisation to attract developer interest. In 2026, with onshore solar at Rs 2.50 per unit and even offshore wind globally declining rapidly in cost, the multiplier creates a significant revenue advantage for offshore wind developers that accelerates the business case for deployment — but the supply chain and grid integration challenges have kept actual deployment near zero.
The first tangible progress came in 2024 when SECI awarded 1 GW of offshore wind capacity off the Gujarat coast to a consortium including ONGC, which brings offshore platform expertise from its upstream oil and gas operations. ONGC’s offshore wind participation is significant — it brings the logistical infrastructure, marine engineering expertise, and balance sheet strength that have been absent from India’s offshore wind development story. The next 5 GW SECI tender is expected in FY2026-27, and the offshore wind supply chain — monopile foundations, offshore transformers, subsea cables — is beginning to develop domestically with support from the PLI framework that MNRE is considering extending to offshore wind components.
The coastal aluminium case: what 1 GW of offshore wind means for Odisha smelters
Offshore Wind for Coastal Aluminium — Odisha Scenario Analysis · 2030 Projection
| Parameter | Current (Coal CPP) | Offshore Wind 2030 (Projected) | Change |
|---|---|---|---|
| Electricity source | Coal captive power plant — ~0.95–1.0 tCO₂/kWh | Offshore wind — ~0.005 tCO₂/kWh lifecycle | 98–99% emission reduction from electricity source |
| Electricity cost | Rs 4.50–5.50/kWh (coal CPP all-in) | Rs 4.50–5.50/kWh (projected 2030 offshore tariff) | Cost parity — no cost penalty for decarbonisation |
| Capacity factor | 85–90% (coal CPP, firm) | 40–45% (offshore wind) — BESS bridge needed | BESS required for non-generating hours — adds Rs 1.50–2.00/kWh |
| Scope 2 GEI (14,500 kWh/t) | ~14.0–14.5 tCO₂/t aluminium | ~0.07–0.10 tCO₂/t aluminium | ~14 tCO₂/t Scope 2 reduction — near-total decarbonisation |
| CBAM certificate cost | ~€1,000–1,050/t (at current EU ETS) | ~€170–230/t (Scope 1 only — anode + PFC) | ~€800/t CBAM saving — ~Rs 7,100/t aluminium |
| CCTS GEI compliance | Actively challenged — coal CPP GEI above sector targets | Dramatically over-achieving — CCC surplus for sale | From compliance cost to CCC revenue |
Frequently Asked Questions
Can an aluminium smelter buy offshore wind RECs without owning the offshore wind facility?
Yes — the 4× REC multiplier applies to all offshore wind generation regardless of whether the RECs are sold to the generator’s own captive consumer or to the open REC market. An aluminium smelter can purchase offshore wind RECs on IEX or PXIL from independent offshore wind developers — acquiring four REC compliance credits per MWh of offshore wind generation for its RPO and RCO obligations, which is four times the compliance value of purchasing solar or onshore wind RECs. At current REC Solar prices of Rs 1,000/MWh, offshore wind RECs would be priced at a premium — approximately Rs 2,000 to 3,000/MWh — but the fourfold compliance value means the effective compliance cost per REC unit is lower than standard solar RECs despite the higher price.
What is the regulatory obstacle to direct offshore wind PPAs for industrial consumers?
The primary obstacle is the absence of a dedicated offshore-to-industrial transmission framework. Current electricity market regulations require offshore wind generators to connect to the state transmission system and sell power either to DISCOMs through competitive auctions or to open access consumers through the existing open access framework. The existing open access framework works for onshore generators because there is established state and regional grid infrastructure. For offshore wind, the transmission from the offshore platform to shore and from shore to a specific industrial consumer requires a point-to-point dedicated line arrangement that CERC and state regulators have not yet formally enabled through a specific offshore wind direct access policy. MNRE has flagged this gap in its 2025 consultation on offshore wind scale-up but has not yet issued a notification.
Sources
- MNRE — National Offshore Wind Energy Policy 2015 and offshore wind target trajectory
- CERC — REC multiplier framework — offshore wind 4× multiplier notification
- SECI — Offshore wind tender results — 1 GW Gujarat coast auction 2024
- Global Wind Energy Council — India offshore wind market outlook 2025–2030