The global maritime industry stands at a critical crossroads. While the mandate to eliminate greenhouse gas emissions looms large, the commercial availability of sustainable alternative fuels remains years away from scaling to global demand.
This creates a challenging gap for vessel operators. How can shipowners successfully navigate this strict regulatory transition using only the tools and technologies available today?
This pressing dilemma took center stage during a recent panel discussion titled “Marine Equipment for Green Shipping in the Absence of Green Fuels” held at the Maritime Technical Networking Summit at Grecotel La Riviera, Greece. Moderated by Antonia Saratsopoulou, Managing Editor of Container News, the panel brought together top regulatory, technical, and manufacturing minds to outline actionable, “no-regret” pathways toward immediate maritime efficiency.
Navigating the Regulatory Mirage: Finding Certainty in Policy
Achieving true green shipping requires a clear understanding of the evolving regulatory framework. Vassilios Demetriades, Principal Advisor on EU Regulatory Policy & Government Affairs at HEMEXPO and Former Shipping Deputy Minister of the Republic of Cyprus, highlighted a core paradox currently facing shipowners.
“Regulators at both the EU and IMO levels must remain technologically neutral—they cannot officially endorse one specific fuel technology over another,” Demetriades explained. While this neutrality keeps the market competitive and open to innovation, it simultaneously generates severe investment uncertainty for shipping companies trying to plot a multi-million-dollar fleet strategy.
With a global market-based measure from the IMO still facing political hurdles, Demetriades emphasized that regional European policy instruments like the EU Emissions Trading System (EU ETS) are a permanent reality. However, a major shift is on the horizon. Following recent EU strategy updates, there is a strong push to link EU ETS revenues directly with financial incentives for shipowners.
Furthermore, Demetriades introduced what he terms a “triple win” effect: providing tangible financial relief to shipowners, boosting the European and Greek marine manufacturing sectors (such as HEMEXPO members) to deliver cutting-edge technologies, and allowing the European Commission to fulfill its climate objectives.
Embracing “No-Regret” Innovations with Existing Fleets
Representing the marine manufacturing sector, Nickie N. Giannoutsou, CEO and Chairwoman of the Board at Eurochem International, shifted the focus to immediate, commercially viable solutions that support green shipping today. Addressing the current lack of scalable low-carbon fuels, Giannoutsou noted that the industry must maximize the efficiency of traditional and transitional options.
“As a chemist, I look at how we can optimize what we currently have,” Giannoutsou stated. When utilizing alternative options like biofuels, for instance, operators frequently encounter high water content, which creates a breeding ground for bacteria. Giannoutsou explained how targeted chemical treatments and specialized additives mitigate these issues, preventing operational failures and optimizing combustion.
Beyond fuel treatments, Giannoutsou emphasized the broader ecosystem of HEMEXPO, an association of Greek marine equipment manufacturers. From waste heat recovery systems (HVAC) and advanced sensor-driven optimization packages to smart LED lighting, specialized manufacturers are providing immediate, off-the-shelf technologies.
These are classified as “no-regret” investments because they ensure immediate compliance and lower operating costs, regardless of which future alternative fuel eventually dominates the global market.
The Reality of Retrofits on 10+ Year Old Vessels
When it comes to older, hard-to-abate vessels, generic solutions often fall short. Manolis Sdougkos, Technical Manager at Gourdomichalis Maritime S.A., provided a grounded, operational perspective on managing bulk carriers that are over a decade old.
Sdougkos clarified that the “secret” to a successful retrofit is avoiding an isolated approach. While Energy Saving Devices (ESDs) like ducts installed on the stern promise nominal efficiency gains of “up to 5%,” real-world conditions often degrade these figures.
Instead, Sdougkos advocated for an integrated, multi-layered strategy to advance green shipping. Because the modern freight market often requires bulk carriers to slow-steam at 11 to 12 knots rather than their original design speeds of 14 knots, a highly effective combination includes:
-
Propeller Re-blading: Optimizing the propeller specifically for lower operational speeds.
-
Engine Derating and Tuning: Re-mapping the engine configuration to match the new propeller profile.
-
Advanced Hydrodynamics: Pairing these mechanical shifts with stern ESDs and premium hull coatings.
When combined, Sdougkos noted that this holistic approach can yield an impressive 10% to 15% reduction in fuel consumption, significantly boosting a vessel’s Carbon Intensity Indicator (CII) rating.
However, adoption remains cautious. Sdougkos pointed out that a primary bottleneck is crew training; introducing highly advanced systems like rotor sails or complex digital optimization tools creates operational anxiety if crews lack the specialized know-how to maintain them. Furthermore, the persistent issue of “split incentives”—where the shipowner covers the capital expense of a retrofit but the charterer reaps the savings on fuel—continues to slow down widespread implementation.
Maturing Technologies: The Case for Air Lubrication
Offering a tech-centric viewpoint, Takis Pappas, CEO and Technical Consultant at PNPappas Consulting Ltd, reinforced the narrative that green shipping is no longer dealing with purely theoretical concepts. Pappas highlighted that several efficiency-driven technologies are already mature, commercially deployed, and serving as the definitive champions of the current decade.
Pappas pointed to wind-assisted propulsion, low-friction coatings (such as silicone and nanotechnology-based hull coatings), main engine control optimization, and hydrogen-based combustion enhancers as proven methods to curb fuel usage. However, he placed his strongest emphasis on air lubrication systems.
Having dedicated the last 12 years of his professional career to this specific field, Pappas noted that air lubrication has graduated from a novel concept to an industry standard. Today, at least 200 vessels worldwide—spanning cruise ships, container carriers, LNG tankers, Ro-Ro vessels, and passenger ships—are actively utilizing these systems to achieve verified, stable fuel reductions between 3% and 6%.
“The most exciting part is that we have only tapped into less than a third of the maximum theoretical potential of air lubrication technology,” Pappas revealed. “This leaves massive room for future engineering advancements.”
Reflecting on his early days at Silverstream—which essentially operated as a startup at the time—Pappas explained that introducing an energy-efficient technology (EET) to the maritime sector was initially an uphill battle. A decade ago, industry discussions rarely centered around sustainability or corporate social responsibility; instead, shipowners made decisions based strictly on financial metrics, demanding a rigid return on investment (ROI) of under three years. Early pioneers like Grimaldi, Carnival, and progressive teams within Shell were rare exceptions that recognized the long-term strategic value of the technology.
Today, the landscape has completely transformed. Fuel savings are no longer the sole economic driver; they are now tied directly to the cost of carbon emissions under new environmental regulations like the EU ETS, making the financial case for retrofitting much stronger.
However, financial viability was only part of the challenge. Pappas explained that the absence of an established regulatory framework initially served as a major barrier to widespread adoption. Overcoming this hurdle required extensive, hands-on collaboration with classification societies and flag administrations to build new safety rules, approval processes, and operational guidelines from scratch. This critical legwork was achieved through close partnerships with Lloyd’s Register, the UK flag via the Maritime and Coastguard Agency (MCA), and the American Bureau of Shipping (ABS).
“The vital lesson here for any emerging maritime technology is that a technical solution alone is never enough,” Pappas emphasized. “You must simultaneously build the regulatory architecture alongside it so the industry can trust it and adopt it at scale.”
When looking toward more distant solutions, Pappas expressed caution. He noted that onboard carbon capture faces severe space and infrastructure bottlenecks, while commercial nuclear propulsion remains bound by heavy regulatory and operational obstacles that will require significant time to resolve.
Artificial Intelligence: The Transition Catalyst
Turning to the role of digitalization, Pappas addressed the rising impact of Artificial Intelligence (AI) on green shipping. Drawing a historical parallel, he reminded the audience of the anxiety and skepticism that surrounded the widespread introduction of personal computers into the workplace forty years ago.
“Computers didn’t arrive to replace human workers, but to help us accomplish more, faster and more effectively. AI represents the exact same technological leap today,” Pappas explained.
As the costs of physical sensors, monitoring equipment, automation, and satellite data communication have plummeted, modern vessels are now generating massive pools of operational data in real time. Pappas asserted that AI is the ideal tool to analyze, quantify, and optimize this information. Rather than acting as a standalone solution to emissions, AI serves as an accelerator that unlocks the full capacity of physical equipment.
For instance, AI algorithms can dynamically adjust voyage routing and speeds based on shifting weather conditions, predict hull fouling patterns to schedule timely maintenance, and continuously tune automated systems—such as modulating air lubrication outputs in real time to match the exact sea state.
The Path Forward
The consensus from the Maritime Technical Networking Summit was clear: waiting on the sidelines for a silver-bullet fuel is no longer a viable strategy for achieving green shipping. Through a combination of integrated technical retrofits, advanced chemical optimization, air lubrication systems, and the analytical power of Artificial Intelligence, the tools to drastically cut maritime emissions are already commercially available.
By leveraging the expertise of specialized marine equipment manufacturers today, the shipping industry can achieve meaningful decarbonization while securing long-term economic resilience.
