New Delhi: State-owned Thai oil and gas company PTT Pcl said its U.S. unit took a step forward on its proposed chemical plant in Ohio that will turn ethane into plastics with an agreement to develop a natural gas liquids storage facility. PTT Global Chemical America (PTTGCA) signed an agreement with Energy Storage Ventures LLC to build a facility to store and transport natural gas liquids (NGL) for PTTGCA’s proposed complex.