Crowley Welcomes eWolf, the First All-Electric Harbor Tugboat in the U.S., Marking a Leap in Sustainability

by Anna

Crowley, a prominent maritime services provider, has officially received delivery of eWolf, heralded as the United States’ inaugural all-electric ship assist harbor tugboat. This milestone underscores Crowley’s unwavering commitment to sustainability and decarbonization within the maritime industry. Crafted by Crowley’s engineering services team, the eWolf is set to operate with zero emissions, delivering performance equivalent to traditional tugboats.

The realization of eWolf is the result of collaborative efforts between Crowley, federal, state, and local government partners. This collective commitment aims to enhance air quality through the utilization of battery energy for the vessel and cutting-edge port technology. The initiative includes the establishment of a shoreside microgrid charging and storage station at the Port of San Diego.


Constructed by Master Boat Builders at its shipyard in Coden, Alabama, the 82-foot harbor tug is anticipated to yield substantial environmental benefits. Over the initial decade of operations, the eWolf is projected to reduce nitrogen oxide (NOx) emissions by 178 tons, diesel particulate matter by 2.5 tons, and carbon dioxide (CO2) by 3,100 metric tons. These figures, according to EPA calculations, are equivalent to eliminating 350,000 gallons of gas from use. The vessel is equipped with ABB’s innovative integrated electrical propulsion system.


Following transport and final demonstration trials, the eWolf is slated to commence harbor operations at the Port of San Diego in spring 2024. The project’s collaborative partners include the Port of San Diego, San Diego County Air Pollution Control District, the California Air Resources Board (CARB), the U.S. EPA, and the U.S. Maritime Administration. Crowley’s microgrid shoreside charging station is poised to play a pivotal role in supporting the sustainable operations of this groundbreaking all-electric harbor tugboat.


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