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42Maritime Reporter & Engineering News compliance. Campbell Foss was the world?s second Hybrid Tugboat, con- verted to hybrid power at the Foss Rainier Shipyard. The 73.4-ft., 144-gt boat built origi- nally in 2005 became Foss? and the world?s second hybrid tug, following the Carolyn Dorothy, which entered service in 2009. The ongoing project entails modifying and testing the boat ?s propul-sion system along with other mainte-nance in advance of its return to service in Long Beach.The Campbell Foss is sister to the Car- olyn Dorothy, which has been bringing cleaner air and fuel efficiency to southern California ports since its 2010 arrival in Los Angeles and Long Beach. The retro- fit included replacing one of the boat?s 125-kW generators with a new 350-kW Detroit Diesel Series 60 generator to sup-port diesel-electric transiting betweenjobs. The main engines will not be changed, but will be used only during ac- tual assist work. Ten Lithium-Polymer batteries provided by Corvus Energy will supply power for the boat?s lights and other systems not related to propulsionand for minor maneuvering during peri- ods of idling. A side-by-side comparison of two Foss Maritime dolphin-class tugs?the Carolyn Dorothy and a con- ventional tug named the Alta June ? showed significant emissions reductions, as follows: 73% reduction for particulate matter (PM); 51% reduction for nitrogenoxide (NOx); and 27% for carbon diox-ide (CO2). Aspin Kemp and Associates (AKA) provided the hybrid electronics and control system that tie the hybrid components together. Similarly, Corvus Energy was integral in the plan to develop a true hybrid en- ergy system for installation on board the offshore supply vessel Viking Lady (fea- tured on the cover of the April 2012 edi- tion of Maritime Reporter & EngineeringNews ) with the company providing the battery pack for energy storage. Viking Lady is unique when compared to any other OSVs. Thanks to its Norwegian heritage, which stresses both maritime in-novation and environmental conserva- tion, the three-year-old LNG-fueled vessel, which is owned by Eidesvik Off- shore, was the very first merchant ship to use a fuel cell as part of its propulsionsystem. The fuel cell, which generates an electric output of 330 kW, was installed in the autumn of 2009 and has success-fully run for more than 18,500 hours.With the Corvus-supplied battery pack is in place, the ship operates using a hybrid system similar to that which has been in-stalled in hybrid cars, and the potential emission reductions are higher and the re-turn on investment period is shorter for ships than it is for cars. The Corvus En- ergy battery back in the Viking Lady will consist of four packs of 17 AT6500 mod- ules, for a total of 68 modules - or about1/2 of a MW. Maximum bus voltage of 856V. Maximum current 1000A. (total: eachpack is rated at 250A, we have four in parallel.The pack needs no cooling system dueto its extremely low internal resistance. The batteries cathode is nickel man- ganese cobalt and has about 20-25% more power than competing lithium ion versions. The primary potential benefits of the hybrid energy system for a ship like the Viking Lady are a 20/30% reduc- tion in fuel consumption and CO2 emis-sions through smoother and moreefficient operation of the engines and fuel cell. The reductions of other exhaust components are even higher. Finally, Corvus Energy's battery packs were ear- lier this year installed in Europe?s first hybrid tugboat, the RotorTug RT Adriaan of KOTUG of The Netherlands. This diesel-to-hybrid retrofit represents Eu- rope's first low emissions hybrid tugboat, and the conversion features Corvus? AT6500 48 volt lithium polymer battery packs. Completed in March 2012, theconverted RT Adriaan, now renamed E -KOTUG RT Adriaan, has rejoined the KOTUG fleet. For example, the harbor tug RT Adriaan is currently achieving a 20 perent savings after being converted to hybrid form. http://www.corvus-energy.com TECHNICAL FEATURE BATTERY POWER ?In under 3 years, Corvus has gone from 6 ?boat guys? with a great idea and homemade business cards to almost 50 of the top minds in electrical and mechanical engineering, who now possess thekey to high power industrial grade energy storage,? Grant Brown, Marketing Director, Corvus Energy MR#8 (42-49):MR Template 8/9/2012 9:31 AM Page 42