Electric tug christened in San Diego

Christening ceremony in the Port of San Diego

(Source: ABB)

The United States’ first all-electric tug has been christened in the Port of San Diego. The Crowley-owned zero-emission eWolf, with a bollard pull of 64 tonnes, has an electric propulsion system from Swiss-headquartered ABB with a 6.2-MWh energy storage system (ESS).

The new tug will significantly reduce carbon emissions in the port area in line with the Port of San Diego’s Maritime Clean Air Strategy.

The tug’s capacity will enable it to complete one entire day on a single charge, using shore power to recharge at night. It replaces a tug that consumed 30,000 gallons of diesel every year.

The eWolf concept was developed through a partnership between the Port of San Diego, San Diego County Air Pollution Control District, the California Air Resources Board, the US Environmental Protection Agency, and the US Maritime Administration. Delivered in January, the vessel is the result of close cooperation between ABB, Crowley’s engineering services group, and Alabama-based Master Boat Builders.

The tug incorporates a range of other ABB systems to enhance safety and efficient operation. These include an Onboard DC Grid to optimise energy use, the ABB Ability Marine Diagnostics to prevent downtime and monitor equipment, and ABB Ability Marine Pilot to underpin safety and reduce crew workload.

The company also provided transformers, propulsion motors, azimuthing thrusters, low-voltage switchboards, design support, engineering, project management, and commissioning.

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