INLAND PROPULSIONDiesel Electric with Energy StorageHYBRID WITH ENERGY STORAGEHybrid with Energy Storage (H/ES) systems make use of a mechanically driven shaft line with a power take off and power take in (PTO/PTI) connected to a motor/gen-erator (M/G) set. The M/G set can take power from the ships electrical system and/or energy storage to provide additional power to the propeller shaft. This system is similar to those in modern hybrid cars. A hybrid system such as this can be especially attractive as a retro? t option for existing vessels. LIFE CYCLE COST ANALYSISEnergy Storage systems should not be considered a one-size-? ts-all solution. As with diesel electric propul-sion systems, a careful study of a towboat’s operational pro? le should be conducted to determine the operational bene? ts. Below is a real operational pro? le used for this case study. This particular vessel is an 1800HP locking river towboat. Hybrid with Energy Storage www.marinelink.com