Green Tug and Coastal Vessel Manufacturing Facility

Project Overview

An Indian marine engineering conglomerate and a European vessel design technology partner engaged IMARC Engineering to establish a greenfield green tug and coastal vessel manufacturing shipyard at Vasco da Gama, Goa. The project was structured against the convergence of four enabling policy frameworks: the Green Tug Transition Programme (GTTP) launched by the Ministry of Ports, Shipping and Waterways targeting the transition of all Indian port tugs to green propulsion by 2040 with 50 percent of tugs to be green by 2030; the Shipbuilding Financial Assistance Policy 2016 (extended to 2026) providing financial assistance of up to 20 percent of contract value for Indian-built vessels; the Maritime Amrit Kaal Vision 2047 released in 2023 targeting USD 80 billion of port infrastructure investment and five-fold shipbuilding capacity growth; and the Sagarmala Programme framework for coastal shipping and port-led development.

The project involved establishing 18 vessels per annum of marine manufacturing capacity across three product families — green tugs featuring electric and hybrid propulsion targeting the Green Tug Transition Programme demand pipeline, coastal cargo feeders supporting the emerging coastal shipping decarbonisation push, and support vessels for port and offshore operations — with combined steel throughput of approximately 8,400 tonnes per annum across the vessel-size range of 20 to 60 metres length overall. Site infrastructure was designed for Phase 2 expansion adding a medium-sized commercial vessel construction dock targeting the emerging Indian medium-vessel shipbuilding demand pipeline.

Client's Challenges

The client faced several specific challenges in establishing greenfield marine vessel manufacturing in India:

• Green propulsion integration: Engineering integrated electric and hybrid propulsion systems into the green tug product family including large-format lithium-ion battery packs, propulsion converters, azimuth thruster systems, and battery thermal management, a fundamentally different propulsion architecture from conventional diesel tug construction requiring new supplier partnerships and integration protocols.
• Coastal shipyard infrastructure: Designing coastal shipyard infrastructure covering the slipway or floating dock for vessel construction, launch, and outfitting workflow across the 20-to-60 metre vessel range, with the associated heavy-lift crane infrastructure, dry-dock or slipway sequencing, and outfitting quay capabilities required for the multi-vessel-family production cycle.
• IRS classification and multi-regulatory compliance: Achieving Indian Register of Shipping (IRS) classification for each vessel alongside Directorate General of Shipping (DGS) regulatory compliance, International Maritime Organization (IMO) standards including MARPOL environmental and SOLAS safety compliance, and additional Green Tug Transition Programme specific green propulsion validation requirements.
• Multi-vessel-family manufacturing sequencing: Coordinating the concurrent construction of green tug, coastal cargo feeder, and support vessel product families sharing shipyard infrastructure but requiring distinct hull forms, propulsion configurations, and outfitting sequences, with the associated production planning, resource sequencing, and quality management complexity.
• Specialty component supply security: Managing supply of marine-grade steel, marine propulsion systems, marine electronics and navigation, and marine outfitting components across a mix of Indian and international specialists, with the associated marine supplier qualification, IRS classification-society equipment approval, and traceability requirements.
• Workforce build-up: Recruiting 480 personnel including marine engineers, naval architects, shipbuilding welders, marine electricians, and quality specialists in the Goa regional labour market, supported by structured technology-transfer partnerships with the European vessel design licensor and by talent inflow from adjacent Indian shipbuilding clusters.

What We Did

• Pre-Investment and Strategic Advisory

Our feasibility study evaluated four candidate Indian coastal locations, Vasco da Gama (Goa), Kakinada (Andhra Pradesh), Ratnagiri (Maharashtra), and Bhavnagar (Gujarat), with Vasco da Gama selected on the strength of Goa's established marine industry ecosystem with associated supplier and technical talent base, natural deep-water port access enabling vessel launch and outfitting operations, established road connectivity to the Mormugao Port for imported specialty component logistics, Goa State industrial policy framework, and access to engineering talent from Goa Engineering College and the surrounding marine engineering education base.

CapEx planning of INR 756 Crore covered the slipway and vessel construction infrastructure, the block fabrication and welding hall, the outfitting quay and heavy-lift crane infrastructure, the paint and finishing area, the marine equipment integration bay, the warehouse, and central utilities. Financial modelling demonstrated post-tax IRR of 18.4 percent at full ramp with a 6.6-year payback inclusive of the Shipbuilding Financial Assistance Policy benefits across the delivered vessel portfolio.

• Engineering and Design Services

IMARC designed a 42,000 sq.m built-up shipyard facility on a 22-acre plot fronting a deep-water launch area, comprising the block fabrication and welding hall for hull sub-assembly construction, the vessel construction slipway sized for the 20-to-60 metre vessel range with associated heavy-lift crane infrastructure, the outfitting quay for post-launch installation of propulsion, electrical, and marine electronics systems, the paint and finishing area with marine-grade coating infrastructure, the marine equipment integration bay for large-format battery pack and propulsion converter integration on the green tug product family, the metrology and quality laboratory, the warehouse and outbound logistics area, and central utilities.

Process utility design covered 6 MW grid demand supplemented by a 1.6 MW captive rooftop solar array, dedicated compressed air and hydraulic supply for welding and outfitting operations, precision temperature and humidity HVAC across the electrical integration and paint zones, comprehensive fire suppression infrastructure engineered for both conventional shipyard and battery-handling zones, and integrated MES for vessel-level and component-level traceability aligned with IRS classification documentation requirements.

• Procurement and Supply Chain Support

We executed a multi-geography procurement programme across 56 critical vendors. Block fabrication and welding equipment was sourced from established European and Korean shipyard equipment specialists with documented references. Heavy-lift crane infrastructure was sourced from European crane specialists with proven shipyard track records. Marine propulsion systems (electric and hybrid) were sourced from established European marine propulsion specialists under structured technology partnership arrangements.

Marine electronics, navigation, and communication systems were sourced from a combination of European and Indian marine electronics specialists holding IRS classification-society type approvals. Marine-grade steel was sourced from qualified Indian steel specialists supplemented by international specialty sources for select grades. Large-format lithium-ion battery packs for the green tug propulsion integration were sourced under long-term agreements with a combination of international battery specialists and progressive qualification of Indian ACC PLI cell-based battery pack integrators. Indian content across the equipment and materials scope reached approximately 64 percent.

• Project Execution and Site Management

Our turnkey project management delivered 26 months from groundbreaking to first commercial vessel launch, coordinating civil construction, coastal shipyard infrastructure erection, heavy-lift crane installation, equipment integration, and phased commissioning across the block fabrication, vessel construction, outfitting, and marine equipment integration zones.

Phased commissioning ran the block fabrication and welding hall first, followed by the vessel construction slipway with the first green tug hull laid down in month 20, then the outfitting quay and marine equipment integration bay for first vessel outfitting including electric propulsion integration, and finally the paint and quality zones for first vessel launch and delivery in month 27.

Multi-vendor coordination across European, Korean, and Indian contractors required an 18-strong owner's engineering team supplemented by 8 European resident engineers from the vessel design technology partner during the vessel construction, electric propulsion integration, and initial vessel launch and sea trial phases.

• Compliance, Quality and Sustainability

IMARC led certification readiness across Indian Register of Shipping (IRS) classification for each vessel product family, with vessels progressively achieving Class certification through the construction, launch, and sea trial cycles, Directorate General of Shipping (DGS) regulatory compliance for coastal operation authorisation, International Maritime Organization (IMO) standards including MARPOL environmental compliance and SOLAS safety compliance, Green Tug Transition Programme green propulsion validation for the electric and hybrid tug product family, Recycling of Ships Act 2019 alignment for end-of-life vessel management framework, and ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and ISO 50001:2018 management system certifications.

Environmental compliance covered Goa State Pollution Control Board Consent to Establish and Operate, Hazardous Waste Authorisation for paint and coating operations, and Coastal Regulation Zone clearance for the coastal shipyard infrastructure.

The facility achieved IGBC Gold certification through 1.6 MW captive rooftop solar covering approximately 21 percent of facility daytime energy demand, 68 percent process water reclamation through closed-loop paint booth water recovery and industrial cleaning cycles, heat recovery from welding and outfitting operations, and 16 percent lower facility energy intensity versus the Southeast Asian shipyard industry benchmark.

Final Results

Operational Performance

The facility achieved mechanical completion in 26 months with first commercial vessel launch and delivery in month 27. Full 18-vessel per annum nameplate capacity was reached at 76 percent utilisation by month 22 of operations, with sustained first-time acceptance across the delivered vessel portfolio. Indian Register of Shipping classification was progressively secured across the green tug, coastal cargo feeder, and support vessel product families in Year-1 and early Year-2, DGS regulatory compliance was completed for the coastal operation authorisation, IMO MARPOL and SOLAS compliance was verified across the vessel portfolio, and successful supplier qualification audits were passed with three Indian port operators, one coastal shipping company, and one regional export customer across the first operational year.

Financial Outcomes

Final CapEx of INR 720 Crore delivered 4.8 percent savings against the INR 756 Crore budget through optimised civil packaging, disciplined Indian-fabrication leverage across the shipyard structural and utility scope, coordinated multi-vendor procurement, and Coastal Regulation Zone-optimised site layout. Shipbuilding Financial Assistance Policy disbursements against the delivered vessel portfolio contributed materially to the project's overall economics. Year-2 revenue of INR 620 Crore was generated at an EBITDA margin of 13 percent, consistent with established Indian shipyard reporting, supported by the specialty-marine pricing structure and the growing Green Tug Transition Programme demand pipeline.

Market Access

Long-term supply commitments were signed with three Indian port operators covering green tug procurement aligned with the Green Tug Transition Programme deployment framework, one coastal shipping company covering coastal cargo feeder offtake supporting the emerging coastal shipping decarbonisation push, and one regional export customer covering support vessel supply for a Middle East port operator. The facility positioned itself as an early participant in the Green Tug Transition Programme first delivery cycle, alongside strategic engagement with the Ministry of Ports, Shipping and Waterways under the broader Maritime Amrit Kaal Vision 2047 shipbuilding capacity build-out framework. Phase 2 planning for medium-sized commercial vessel construction dock development was initiated within the first operational year, aligned with the growing Indian commercial shipbuilding pipeline.

Sustainability Impact

Our integrated design, combining 1.6 MW captive rooftop solar covering approximately 21 percent of facility daytime energy demand, heat recovery from welding and outfitting operations, variable-frequency drives across HVAC and process systems, and LED lighting throughout, achieves 16 percent lower facility energy intensity versus the Southeast Asian shipyard industry benchmark. Process water reclamation reaches 68 percent through closed-loop paint booth water recovery and industrial cleaning cycles.

The green tug product family enables measurable emissions reduction across Indian port tug operations aligned with the Green Tug Transition Programme's 2030 and 2040 milestones. Coastal Regulation Zone-optimised site layout minimises the shipyard's coastal environmental footprint, and the facility holds IGBC Gold certification with structured end-of-life vessel material recovery partnerships aligned with the Recycling of Ships Act 2019 framework.

Strategic Impact

The project established a meaningful greenfield green tug and coastal vessel manufacturing capability under the Green Tug Transition Programme framework, positioning the client at the intersection of the Ministry of Ports, Shipping and Waterways structural policy push comprising the 2030 milestone for 50 percent green port tugs and the 2040 milestone for full green tug transition, the coastal shipping decarbonisation trajectory under the Sagarmala Programme, and the broader Maritime Amrit Kaal Vision 2047 shipbuilding capacity build-out.

Year-2 revenue of INR 620 Crore, IRS classification across the vessel portfolio, three Indian port operator green tug supply commitments, and the export entry into the Middle East port operator market led the client to approve Phase 2 expansion comprising a medium-sized commercial vessel construction dock targeting the emerging Indian commercial shipbuilding demand.

IMARC Engineering's end-to-end EPCM advisory, combining shipyard infrastructure design, green propulsion integration engineering, Green Tug Transition Programme scheme navigation, IRS classification pathway support, and disciplined multi-vendor execution, enabled the client to anchor a strategically important Indian industrial asset in a sector where the combination of policy transition complexity and multi-regulatory compliance had historically restricted greenfield investment to established public-sector shipyards.