The cranes are for moving objects inside the container yard. They are designed with large lithium-ion battery packs that store electricity generated every time a load is lowered by the crane and supply that electricity to a motor that provides supplemental power to move the crane. This reduces the need to run the engine, which in turn helps reduce the crane's carbon dioxide emissions by 60%.

...The total value of the orders is 600 million yen. The company will provide two cranes each for the harbors in Tokyo and Kobe, with the supply date set for April or May of 2011.