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    NTSB Investigation: Officers’ distraction causes vessels to collide

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    Tanker breaks down in Suez Canal causing brief disruption

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SAFETY4SEA

31 million tonnes of green methanol necessary to replace diesel fuel of North American fleet

by The Editorial Team
August 4, 2022
in Emissions
intercargo net zero shipping
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The Blue Sky Maritime Coalition (BSMC) has released a new report which provides a current benchmark for CO2 emissions from the major vessel sectors that make up maritime transportation in North America.

Key highlights

  • Approximately 31 million tonnes of “green” methanol would be required to replace the diesel fuel now burned by the North American Waterborne  Transportation (“NAWT”) fleet.
  • Annual emissions of approximately 47 million tonnes of CO₂ would be eliminated by replacing diesel with an emissions free alternative fuel.
  • The value of eliminating the NAWT fleet’s CO₂ emissions is nearly $250 million per year on that basis, a present value of $2.3 billion at a 10% discount rate.

Annual CO₂ emissions from the NAWT fleet and from ports in North America were estimated to amount to 66 million tonnes in 2018, approximately 1.0% of the 6,6571 million tonnes of total North American CO₂ emissions in that year. Of that 66 million tonnes, 47 million tonnes are attributable to fuel consumed by the NAWT fleet and 19 million tonnes by North American ports.

The fleet

Total CO₂ emissions from the 9,500 vessels in the NAWT fleet amounted to approximately 47 million tonnes in 2018. That amounts to 0.7% of total emissions from the U.S. and Canada, 2.4% of total emissions from the transportation sectors of North America, and 4.5% of total CO₂ emissions from the global shipping fleet (as reported by the IMO in the 4th Greenhouse Gas Study).

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  • The largest single contributor to NAWT emissions is the offshore support vessel fleet, amounting to 29% of total emissions. Although the offshore support vessels comprise approximately 17% of the NAWT fleet, the vessels have relatively high fuel consumption and utilization.
  • The inland tug and pushboat fleet is the second largest CO₂ emissions contributor, at 9.3 million tonnes or 19% of total emissions.
  • The coastal and harbor tug fleet and ferries are the third and fourth largest contributors, at 6.8 million tonnes and 6.4 million tonnes respectively, or 14% apiece of total emissions.
  • Tankers and Articulated Tug-Barges (“ATBs”) account for just 3.1 million tonnes or 6% of total NAWT CO₂ emissions.

Ports and terminals

The ports of Houston, New York/New Jersey, Los Angeles, and Long Beach provide comprehensive information on both tonnage throughput and emissions. Total tonnage throughput for the U.S. amounts to 2,349 million short tonnes; these four ports accounted for 25% of the cargo movements into and out of the U.S. in 2018.

Total Canadian port tonnage was 335 million tonnes in 2017. Applying the 0.007 ratio derived from the four U.S. ports, total CO₂e emissions from Canadian ports is estimated to be 2.4 million tonnes.

Total North American port related emissions thus amount to 18.9 million tonnes of CO₂e.

Net zero fuels and electricity

Total green methanol production funded by Maersk is reported to amount to 0.7 million tonnes/year by 2025 of green methanol bunker fuel and 6 million tonnes/year by 2030 globally (meeting approximately 25% of their fuel requirement). The electricity required to produce net-zero fuels is immense. For example, 317 TWh would be required to produce the 31 million tonnes of methanol necessary to replace all the high carbon-content, oil-based fuel now consumed by the NAWT fleet. 317 TWh would amount to more than 10% of the projected renewable electricity production of the U.S. in 2030.

These net-zero calculations illustrate the challenge of converting the NAWT fleet to zero emissions. But they also show a path to achieving that goal. LNG is already making a significant headway in the NAWT fleet (see the comments in the offshore supply vessel and containership sections). Methanol is also being championed by Maersk, a key industry leader with whom many in the NAWT business already have close commercial relationships.

Operational factors

Advances in cellular, satellite, and internet-based communications over the past decade have opened up new opportunities to optimize the use of existing vessels. Such optimizations could now be based on real-time, high quality data on vessel traffic, weather forecasts, port and berth congestion to provide predictive models. These models would require the involvement of all elements of the supply chain to provide up-to-date information to a shared clearinghouse.

The benefit of these models is that vessels could be confidently operated at the best economic speed (lowest fuel consumption and therefore emissions) available to get the cargo to the berth for a specific time slot rather than next open availability. Current business practice causes vessels to arrive as quickly as possible consuming more fuel in transit and then in most instances to wait at anchor where more fuel is consumed generating onboard electricity.

EXPLORE MORE AT BSMC’S REPORT ON NORTH AMERICAN FLEET

Tags: ammoniadecarbonizationgreen practicesreducing shipping emissionsreports

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