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www.sea-technology.com July 2014 / st 21 used in the majority of marine appli- cations today, the modules are small and lightweight, delivering the lightest footprint in an industrial capable pack- age. The energy storage system (ESS) is capable of supplying tremendous am- perage for instantaneous vessel and machinery starts. In the case of the Østensjø PSV, the system is anticipated to support dynamic positioning mode by delivering burst outputs up to 2 megawatt-hours for the 273-kilowatt- hour system. Further, the ESS is capable of a recharge in as fast as 20 minutes. Kotug's RT Adriaan—Hybrid Harbor Tug Europe's frst hybrid tugboat is the RotorTug RT Adriaan of Kotug (Rot- terdam, Netherlands). This diesel-to- hybrid retroft represents Europe's frst low-emissions hybrid tugboat. The conversion features standard Corvus AT6500 48-volt modules and translates to improved fuel economy, maintenance savings, increased usable battery power and a signifcant reduc- tion in harmful emissions. Integration partners Aspin Kemp and Associates (AKA), based in Stratford, Canada, were instrumental in providing a ro- bust and reliable hybrid system. The AKA patented and proven XeroPoint Hybrid drive system has been de- ployed on most of the hybrid tugs now in operation worldwide. Completed on March 6, 2012, the converted RT Adriaan, renamed E-Ko- tug RT Adriaan, has rejoined the Kotug feet. The tugboat is located in Port of Rotterdam, one of the largest ports in the world, where it is fully operational and is optimizing its hybrid modes. "Since the conversion, we are very pleased with the initial results of the E- Kotug and look forward to monitoring the tug's progress," said Daan Merkel- bach, Kotug's Nautical and QHSE manager. Based on the success in effciency gains and emissions reduction, Kotug is in the process of deploying two ad- ditional Corvus Energy/AKA XeroPoint Hybrid harbor tugs. The Robert Allan (Vancouver, Canada) designed ART 80-32 vessels are due to be in opera- tion in the summer of 2014. Scandlines Prinsesse Benedikte— Hybrid Passenger Ferry MF Prinsesse Benedikte is the world's largest hybrid electric vessel, commissioned in July 2013, for Scan- dlines (København, Denmark). At 142 meters and 14,822 gross tons, it is not only the largest, but also the frst ferry in the world to make large-scale use of an onboard ESS. Prinsesse Benedikte, originally built in 1993 with a traditional diesel elec- tric driveline, has now been reft with Corvus Energy's advanced ESS. The ESS is comprised of 399 AT6500 48- volt industrial lithium-polymer mod- ules and has a DC bus voltage of 932 volts and a total system capacity of 2.7 megawatt-hours. As such, it is the largest pack of its type ever deployed. Existing Siemens (Munich, Germany) and Kongsberg (Kongsberg, Norway) power electronics and control tech- nology infrastructure were integrated into this new ESS. While building a large hybrid vessel of this type is in itself a challenge, the fact that many of the vessel's systems were designed and deployed 20 years ago provided even greater challenges and required a level of cooperation among integrators never previously undertaken. Integra-