Corvus containerized ESS will supply shore power for Crowley eWolf all-electric tug

Bergen, Norway and Bellingham, WA, USA, November 30, 2022 — Corvus Energy is pleased to announce that our participation in the innovative Crowley eWolf zero-emission tugboat project has expanded with an order to supply shoreside battery energy storage systems (ESS) using two Corvus Orca BOBs—the containerized version of its market-leading Corvus Orca ESS—with a total energy storage capacity of 2,990 kWh.

The Crowley eWolf, the first all-electric tug in the U.S., and its shoreside charging infrastructure will go into service in San Diego’s harbor in 2023. Corvus Energy also supplying the 6.2 MWh Corvus Orca ESS on board eWolf. The vessel is under construction at Master Boat Builders, with electrical integration provided by ABB.

“The use of the Corvus Orca ESS shoreside will allow eWolf to charge quickly, potentially avoiding the need to upgrade the electricity grid infrastructure at the port,” remarks Ole Jacob Irgens, Corvus Energy – President Americas. “Since the Orca ESS has a high C-rate, it is capable of discharging quickly and safely so that eWolf will be quickly recharged and returned into service.”

The eWolf and the shoreside infrastructure are designed to allow the vessel to operate fully electric with full performance capabilities, as well as draw energy at off-peak hours from the energy grid. The eWolf is a result of a partnership among Crowley, the San Diego County Air Pollution Control District, the California Air Resources Board, the Port of San Diego, the U.S. Environmental Protection Agency and the U.S. Maritime Administration, which all provided financial support and other resources. More information can be found at

“Corvus Energy’s storage system will enable Crowley and our federal, state and local partners to reach our shared commitment of reducing emissions and providing cleaner air for the San Diego community. The innovative technology also will help ensure high performance and reliability as the tugboats serves customers – providing a model for sustainability at ports around the nation,” said Paul Manzi, vice president, Crowley Shipping.

Battery energy storage a viable alternative shoreside energy
The eWolf and its shoreside energy technology are examples of innovative maritime sustainability opportunities to help decarbonize the maritime industry. Crowley and Shell Trading (US) Company (“Shell”) have signed a memorandum of understanding (MOU) focused on supporting alternative energy solutions for shoreside and terminal operations. The Corvus Orca BOB shoreside battery energy storage system reflects this commitment.

“We recognize that the world is in the midst of an energy transition, and we’re working hard to play our part,” said Maarten Poort, general manager of Shell Shipping & Maritime Americas. “As both an investor and customer of Corvus Energy and its innovative ESS products, Shell is proud to support battery energy bunkering as a zero-emission alternative energy solution for shore power.”

Corvus Orca BOB plug-and-play battery room
The Corvus Orca BOB containers will each contain almost 1.5 MWh of energy storage capacity and be capable of “fast-charging” the Crowley eWolf tug. The Corvus Orca BOB is a class-approved, modular battery room solution in standard 20-foot ISO high-cube container size. The complete ESS comes with Orca battery modules, battery monitoring system (BMS), HVAC , TR exhaust, and firefighting and detection system. The “Plug and Play battery room” simplifies integration into any system integrator’s power management system on board a ship.

Caption: Corvus Orca BOB will be used for shoreside charging of the Crowley eWolf in the Port of San Diego. (Courtesy of Crowley)
Caption: Corvus Orca BOB is a plug-and-play battery room, available in standard 10’ or 20’ container footprints containing 744 kWh and 1492 kWh respectively and capable of fast discharge/charging. © Corvus Energy
About Corvus Energy
Corvus Energy provides high power energy storage in the form of modular lithium-ion battery systems to the maritime industry. Its purpose-built, field-proven battery systems provide sustained power to hybrid and all-electric heavy industrial equipment, including large marine propulsion drives. Corvus Energy has amassed unsurpassed experience from 650 projects, totaling over 500 MWh and more than 4,5 million operating hours. The company also develops maritime hydrogen fuel cells in collaboration with the world leader in fuel cell technology, Toyota Corporation.
For more information, please visit

About Crowley
Crowley is a privately held, U.S.-owned and -operated maritime, energy and logistics solutions company serving commercial and government sectors with more than $2.9 billion in annual revenues, over 170 vessels mostly in the Jones Act fleet and approximately 7,000 employees around the world – employing more U.S. mariners than any other company. The Crowley enterprise has invested more than $3 billion in maritime transport, which is the backbone of global trade and the global economy. As a global ship owner-operator and services provider with more than 130 years of innovation and a commitment to sustainability, the company serves customers in 36 nations and island territories through five business units: Crowley Logistics, Crowley Shipping, Crowley Solutions, Crowley Wind Services and Crowley Fuels. Additional information about Crowley, its business units and subsidiaries can be found at

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