Waller LNG Services is waiting on the Department of Energy, hoping its project to liquefy and export cheap U.S. natural gas will get off the ground fast. But unlike more than a dozen firms awaiting a glimpse of DOE's export policy direction, Waller LNG doesn't expect to wait long, and officials there aren't too worried. That is because Waller's strategy depends not on filling massive tankers with liquefied natural gas for export to Asia, but on filling relatively tiny barges with the fuel for ferrying around the U.S. coastline and the Caribbean.