The largest container ship built in the U.S. arrived Wednesday at Honolulu Harbor.

Named in honor of Hawaii’s late senior U.S. senator, the Daniel K. Inouye is the first of four new ships being built for Matson that will be introduced in Hawaii over the next two years.

The ship weighs in at over 51,000 metric tons and reaches speeds of up to 23 knots.

All four vessels will incorporate a number of “green ship technology” features, including a more fuel efficient hull design, dual fuel engines that can be adapted to use liquefied natural gas, environmentally safe double hull fuel tanks, and fresh water ballast systems.

The ships are part of a nearly $1 billion investment by Matson, which also includes a terminal expansion and modernization project at its Sand Island facility.