Wallenius Marine has completed a major retrofit of the 27-year-old ro-ro vessel Lakeway Express, achieving verified fuel savings of up to 23% at 15 knots and an upgraded DNV class rating. By pairing a re-engineered bulbous bow with high-efficiency propeller blades, the project demonstrates a highly profitable, regulatory-compliant lifecycle extension strategy that delivers an impressive 2.6-year return on investment for legacy fleets.
Stockholm, Sweden | May 12, 2026 – In a powerful demonstration of the commercial viability of lifecycle extension programmes, Wallenius Marine has finalized the post-retrofit performance metrics for the Swedish ro-ro freight vessel Lakeway Express. The data confirms that targeted hydrodynamic and mechanical upgrades can systematically align legacy hulls with tightening environmental standards, yielding up to 23% in fuel savings at a service speed of 15 knots.
The extensive engineering package was executed at the Remontowa Shiprepair Yard in Gdańsk, Poland, during a tight holiday yard stay. Managing a condensed schedule under reduced seasonal staffing across vendors and class functions, Wallenius Marine oversaw the full project cycle, encompassing technical planning, classification society coordination, cost controls, and subsequent sea-trial performance validation.
Technical Deconstruction: The Hydrodynamic & Propulsion Upgrades
The Lakeway Express (IMO 9183790), a 153-meter roll-on/roll-off vessel built in 1999, serves as a primary asset on short-sea Baltic transit corridors. Retrofitting a vessel with nearly three decades of service requires an exact, data-driven alignment with the ship’s specific operational profile rather than off-the-shelf equipment installations.
To achieve a 23% reduction in specific fuel consumption, Wallenius Marine focused on minimizing wave resistance and optimizing the entire aft-to-fore propulsive line.
The Efficiency Optimization Chain
The technical upgrade routes kinetic and mechanical adjustments through three interconnected stages to minimize energy loss:
- Forebody Dynamics (Tailored Bulbous Bow): Re-engineers water displacement at the bow to structurally minimize wave resistance.
- Propulsive Conversion (High-Efficiency Blades): Maximizes energy extraction from the modified hull wake field to deliver cleaner forward thrust.
- Automation Feedback (Eco Control Optimization): Regulates the engine torque loop in real time, dynamically matching mechanical output to changing sea conditions.
Key Technical Enhancements
- Re-Engineered Bulbous Bow: The original bow structure was removed and replaced with a newly designed bulbous bow. This geometry was optimized specifically via Computational Fluid Dynamics (CFD) to match the ship’s actual operating speeds and draft variations rather than its original design speed from 1999.
- Propulsion System Overhaul: The main propulsion shaft was fitted with new, high-efficiency propeller blades designed to maximize thrust within the modified wake field. This was paired with an integrated Eco Control optimization system to dynamically govern engine torque and revolutions relative to real-time sea states.
- Mechanical Stabilization: Auxiliary upgrades featured a complete technical tear-down and overhaul of the ship’s stabilizers, improving safety and reducing parasitic drag caused by unnecessary hull rolling in rough Baltic waters.
- Navigation & Safety Architecture: The bridge systems received a comprehensive electronics overhaul, alongside modernized fire and engine room alarm safety suites to bring the vessel into alignment with modern DNV safety regulations.
The Financial Reality: Class Re-Grading and a 2.6-Year ROI
For vessel owners globally, the capital expenditure required for alternative fuel newbuildings remains a significant financial hurdle. The results from the Lakeway Express project present a highly competitive alternative: extending the commercial competitiveness of existing tonnage with short-horizon paybacks.
Verified Project Outcomes
| Metric | Pre-Retrofit Baseline | Post-Retrofit Verified Status |
| Fuel Consumption (at 15 knots) | 100% Base Metric | 23% Reduction |
| DNV Quality Rating | Rated: Fair | Upgraded to: Good |
| Crew Welfare Framework | Standard Layout | Full Accommodation & Wet Space Refit |
| Project Payback Period (ROI) | N/A | 2.6 Years |
The structural upgrades prompted classification society DNV to elevate the vessel’s official grading from Fair to Good across multiple baseline operational categories, including hull structures, deck equipment, electrical installations, mechanical machinery, and onboard safety assets. Simultaneously, crew welfare was addressed via a full-scale upgrade of the accommodation areas and interior wet spaces.
“Achieving both significant fuel savings and an upgraded DNV grading on a vessel with 25-plus years in service is a very strong result,” said David Andreasson, Superintendent and Project Lead at Wallenius Marine. “It demonstrates that existing tonnage can continue to perform competitively with the right technical investments and project management.”
Macro Context: Mitigating the Newbuilding Squeeze
The success of the Lakeway Express retrofit addresses a critical macroeconomic challenge facing the short-sea shipping and ro-ro sectors:
- Ratcheting Regulations: Vessels operating in the Baltic Sea must comply with strict Emission Control Area (ECA) mandates, alongside the phased-in costs of the EU Emissions Trading System (EU ETS) and tightening Carbon Intensity Indicator (CII) brackets.
- The Fleet Age Problem: A significant portion of the global short-sea cargo fleet is approaching old age. However, shipyard capacity remains backlogged with long-lead container ship and LNG carrier orders.
- Capital Allocation: With a validated return on investment of just 2.6 years, targeted retrofits allow operators to defer massive newbuilding capital allocations while dropping their emissions footprint immediately.
By optimizing legacy vessels to cross regulatory thresholds, owners can maintain service frequencies on critical short-sea corridors without absorbing the steep asset depreciation risks associated with unproven first-generation alternative fuel systems.
About Wallenius Marine: Leading the Transition to Sustainable Shipping
Based in Stockholm, Sweden, Wallenius Marine is a global frontrunner in ship design, newbuilding, and ship management. Their core strategy is rooted in the “upstream” philosophy: solving environmental challenges at the design stage rather than relying solely on end-of-pipe solutions.
Strategic Mission
- Modal Shift: A primary goal is moving global freight from road to sea, which significantly lowers total atmospheric emissions.
- Wind Propulsion: Leading the “wind revolution” through the Oceanbird concept, a joint venture with Alfa Laval, aiming for vessels that reduce emissions by up to 90%.
- Data-Driven Excellence: Utilizing big data and digital twins to manage fleets with maximum fuel efficiency.
- Continuous Innovation: Operational feedback from the current fleet (like the Sleipner series) is directly integrated into the design of the next generation of vessels.
Wallenius Marine at a Glance
- Global Presence: Approximately 800 employees across strategic hubs in Sweden, Singapore, Philippines, and Myanmar.
- Operational Hubs: Two primary ship management offices located in Stockholm and Singapore.
- Proven Track Record: Since the mid-1990s, the company has designed and supervised the construction of more than 70 sustainable vessels.
- Industry Standards: Fully certified under ISO 9001:2015 (Quality Management) and ISO 14001:2015 (Environmental Management).
- Heritage: A family-owned enterprise and a core pillar of the Soya Group, which has been a pioneering force in the maritime sector since 1934.
Source: Wallenius Marine