Antero Warns of Winter Propane Shortages Without Adequate Stock Builds Executives at Appalachian pure-play Antero Resources Corp., the nation’s second largest natural gas liquids (NGL) producer, are warning that without an adequate build in propane inventories through the fall, the world would be undersupplied this winter. “U.S. domestic propane buyers will need to outbid export markets this summer to build sufficient inventories for this upcoming winter,” said Antero’s David Cannelongo, vice president of liquids marketing and transportation. “That in turn will drive U.S. and inte...