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Summary of Renewable Energy Options for Shipping

Core Content

The shipping industry is a critical component of global trade, responsible for transporting approximately 90% of all traded goods. It has historically relied on fossil fuels such as coal, heavy fuel oil (HFO), and marine diesel oil (MDO), which are high-emission sources. However, due to environmental concerns, regulatory pressures, and rising fuel costs, there is a growing interest in renewable energy solutions for maritime transport.

Renewable energy technologies are being explored for use in ships of all sizes, including primary, hybrid, and auxiliary propulsion systems, as well as on-board and shore-side energy applications. The transition to renewables is expected to be gradual, with limited near-term impact due to existing infrastructure and economic constraints.

Main Renewable Energy Options

1. Wind Energy

Wind is a well-established and renewable energy source that has been used historically. Modern applications include:

• Soft Sails: Proven technologies used on small to medium vessels, such as Greenheart's 75 dwt freighter, B9 Shipping's 3000 dwt bulker, and Dykstra/Fair Transport's 7000 dwt Ecoliner. These use Dyna-Rig systems, which can be retrofitted or integrated into new designs.
• Fixed Wings: These are being tested on various vessel types, including the UT Wind Challenger.
• Flettner Rotors: Used in the Alcyone and Enercon's E-Ship 1, these rotating cylinders generate thrust using the Magnus effect.
• Kite Sails: Deployed on the MS Beluga Skysails, these can provide significant fuel savings.
• Wind Turbines: Still in development, with no successful prototypes to date.

2. Solar Photovoltaics (PV)

• Solar PV is primarily used for auxiliary and ancillary power, especially on small ships.
• Examples include the NYK's Auriga Leader and SolarSailor by OCIUS Technology.
• Some vessels, like the SolarSailor, have reported fuel savings of 5–100%, depending on application, with a relatively short payback period.

3. Biofuels

• Biofuels, including first-generation (e.g., FAME, SVO), second-generation (e.g., HVO, LBM), and third-generation (e.g., algae-based fuels), offer a viable alternative to fossil fuels.
• The Meri cargo ship is a notable example of a vessel using 100% bio-oil.
• Biofuels have high potential for reducing emissions, but their global availability and cost-effectiveness are key challenges.

4. Wave Energy

• Wave energy is being explored for both main and auxiliary propulsion, primarily in new builds.
• Technologies are in early stages of development, with limited current applications.

5. Hydrogen Fuel Cells

• Hydrogen fuel cells are being tested on small ferries and passenger vessels, such as the FCS Alsterwasser.
• These systems offer zero emissions but face challenges in hydrogen production sustainability and cost-effective storage.

Key Viewpoints

• Emissions Concerns: The shipping industry is a significant contributor to greenhouse gas emissions, accounting for about 2.8% of global emissions. Emissions are expected to rise unless cleaner technologies are adopted.
• Regulatory Drivers: The International Maritime Organisation (IMO) and MARPOL have introduced regulations such as EEDI and SEEMP to promote energy efficiency and reduce emissions.
• Technological Potential: Renewable energy can offer significant fuel savings and emission reductions, especially for small ships and in hybrid configurations.
• Barriers to Adoption:
  • Commercial Viability: Many renewable energy solutions are not yet economically competitive.
  • Split Incentives: Ship owners and operators often have conflicting interests, limiting investment in clean energy.
  • Infrastructure Lock-In: Existing investments in fossil fuel infrastructure hinder the rapid adoption of renewables.
  • Lack of Data: Insufficient data on deployment costs and benefits of renewable energy solutions remains a challenge.
• Market and Policy Role: Market forces and supportive policies will be crucial in accelerating the transition to renewable energy. Investment in R&D, proof-of-concept projects, and incentives for small ships are particularly important.

Key Information

• The global shipping tonnage has grown from 2.6 billion to 9.5 billion tonnes between 1970 and 2013.
• Fuel consumption for the global marine fleet between 2007 and 2012 averaged 250–325 million tonnes annually.
• The shipping industry is expected to grow further, with emissions potentially tripling by 2050 if no action is taken.
• Renewable energy solutions, such as wind and solar, have shown promise in reducing fuel costs and emissions, with some achieving up to 25% and 5–100% savings.
• Hydrogen fuel cells and biofuels are also being explored but face technical and economic challenges.
• The transition to renewables requires integrated systems engineering and a shift in operational paradigms, such as weather-based routing.
• The use of renewables is more feasible for smaller ships and in hybrid configurations than for large vessels.

Recommendations

• Policy Support: Governments and international bodies should provide incentives for R&D, demonstration projects, and the adoption of renewable energy technologies.
• Focus on Small Ships: Since small ships are more numerous and have higher emission rates per unit of cargo, they should be prioritized for renewable energy integration.
• Encourage Hybrid Solutions: Combining renewable energy with traditional systems can maximize efficiency and reduce emissions more effectively.
• Address Split Incentives: Policies should be designed to align the interests of ship owners and operators in adopting clean energy.
• Invest in Infrastructure: Infrastructure development for renewable energy storage and distribution is essential to support the transition.

Conclusion

Renewable energy has the potential to significantly reduce the environmental impact of the shipping industry, but its adoption is constrained by economic, regulatory, and technical factors. A holistic approach that includes policy support, R&D investment, and infrastructure development is necessary to enable a smooth and effective transition to cleaner energy sources.