http://www.nassco.com/news-center/news-releases/2015/041815.html
As part of a two-ship contract signed in December 2012 with TOTE, the 764-foot-long Marlin class containerships will be the largest dry cargo ships of any kind in the world powered by LNG. This ground-breaking green ship technology will dramatically decrease emissions while increasing fuel efficiency as compared to conventionally powered ships. The ships will also include a ballast water treatment system, making them the greenest ships of their size anywhere in the world.
Upon delivery in late 2015, the Jones Act-qualified ships will operate between Jacksonville, Florida, and San Juan, Puerto Rico.
That's thank to the hard core Leftist EPA, OSHA, and Special Interest Union efforts.