Page 51: of Marine News Magazine (January 2018)

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ABS has granted Approval in Principle to

Wärtsilä for a hybrid-powered, tug design.

The new design will form the foundation for Wärtsilä’s new portfolio of tug designs, known as the Wärtsilä HYTug Series.

maritime industry is increasingly interested in using su- Looking Ahead percapacitors as an energy-storage solution when quick While the early interest and application of hybrid power delivery of energy is required during a peak loading condi- systems has come from OSV and tug owners, technically, tions, such as when OSVs use power thrusters for dynamic there is no limit to the size of vessel that could be powered positioning while station-keeping. by a combined supercapacitor-battery ESS. River, inland

Other diverse examples of how they and other energy and portside operations have similar opportunities for hy- storage systems could enhance operations include: brid development. • When used for load leveling or peak-shaving, superca- For example, both lithium ion batteries and supercapac- pacitors act as an energy buffer to supply or absorb power, al- itors are scalable, allowing the owner to expand from cell, lowing generators to be operated at a near constant load. Their to module, to pack, iteratively increasing the storage ca- ability to optimize power loading and reduce running hours pacity as required. Numerous side-by-side batteries could can reduce maintenance requirements. With optimal loading, be run by a power-management system, which has sub-sets a higher average load can be maintained, resulting in a more for capacitor management and battery management. stable and ef