Following the success of the world’s first all-electric-driven harbour tug, naval architects have created designs for larger towage vessels
Navtek Naval Technologies has developed designs for all-electric tugs and harbour support vessels following almost a year’s operation of the first zero-emissions electric Zeetug, Gisas Power, in Turkey.
This tug was built at TK Tuzla Shipyard for Turkish owner GISAS Shipbuilding Industry in 2019 to a Zeetug30 design. The 18.7-m tug is operating in the shipyard zone in the Port of Istanbul. It has 32 tonnes of bollard pull and a service speed of 10 knots.
Its power comes from two 1,450-kW lithium-ion battery packs supplied by Corvus Energy. Gisas Power has a beam of 6.7 m, depth of 4.7 m and design draught of 3.5 m.
Navtek Naval Technologies general manager Ferhat Acuner said other designs “are in the pipeline” for Zeetugs of different sizes and bollard pulls.
“Now Zeetug technology is proven, there could be several follow-on projects for all-electric tugs, craft and ferries,” said Mr Acuner.
There is already a project to produce a tug to Zeetug45 design and with around 45 tonnes of bollard pull, with this project described by Mr Acuner as “ongoing”.
Zeetug5 and Zeetug20 designs are being researched, along with a 60-tonne bollard pull Zeetug60, said Mr Acuner.
Plus Navtek has designs for an all-electric NV718 garbage and sewage collection tanker. Navtek’s NV225 design is for a surface grid collection vessel. These projects are also described as “ongoing”.
Navtek also has NV273 design for a remotely operated service and fire-fighting vessel and a NV274 design for an all-electric port service vessel. “This is a research and development project to make an all-electric port with zero emissions,” said Mr Acuner.
For now, Gisas Power is reducing emissions in the Port of Istanbul. Zeetug30 is expected to save 210 tonnes in CO2 emissions and 9 tonnes of NOx emissions in a year.
For safety, this tug has two redundant battery rooms, one fore and one aft, that are maintained at a constant temperature by a cooling system.
For the design and construction of Gisas Power, Navtek collaborated with fellow Turkish power systems integrator BMA Technology and drive and converter supplier ABB.
Navtek Naval Technologies general manager Ferhat Acuner will present the latest Zeetug designs and provide more details on Zeetug30 during his presentation on 1 September during Riviera’s Tug Technology Webinar Week. Use this link for more details and to register for these three webinars that will also include presentations by tug owners Wilson Sons, PSA and Great Lakes Towing, Port of Antwerp and Port of Lulea.