Nearly a year ago MDN tipped you off that the Rockies Express (REX) Pipeline would reverse at least part of its flow and start sending natural gas from the Utica/Marcellus to the Midwest (see REX Reverses Pipeline Flow from OH for Mystery Utica Customer). That momentous day has arrived. As of today, a new 14.3-mile lateral is flowing gas north from the MarkWest Seneca natural gas processing plant to the REX mainline, where a newly built compressor station will allow the gas to be delivered to points west in Ohio, Indiana, and Illinois. Eventually the gas may also go to Missouri…