Rockies Express Pipeline

The pipeline is operated by Rockies Express Pipeline, LLC, a partnership between Tallgrass Energy Partners, Phillips 66 and Sempra Energy. In February 2006, Kinder Morgan Energy Partners and Sempra Energy acquired Entrega Gas Pipeline Inc., from EnCana Corporation. In June 2006, ConocoPhillips acquired 24% of the project. ConocoPhillips spun off the downstream part of its business in May 2012. ==Environmental concerns==

The pipeline project has raised some environmental concerns. Ohio officials have asked to avoid crossing the Big Darby Creek in Pickaway County and the Little Miami River in Warren County within Caesar Creek State Park because of the risk of harming fish and other wildlife posed by drilling the pipeline beneath the rivers. A Lawsuit by American Energy Corporation was filed against REX over the disruption of a coal mine owned by AEC beneath REX. In light of past pipeline accidents, where subsiding abandoned mines have caused pipelines to fail, the wisdom of the location of that part of the REX pipeline is of concern to pipeline industry critics. ==Technical description==

The diameter of long pipeline system varies between , being primarily . The capacity of the pipeline is . It operates at a maximum allowable operating pressure of . The initial cost of the pipeline was around US$5 billion. REX Entrega (Zone 1) REX Entrega is the long former Entrega Pipeline between the Meeker Hub in Rio Blanco County, Colorado, and the Cheyenne Hub in Weld County, Colorado. Construction of this pipeline was authorized in August 2005. REX West (Zone 2) REX West is a long pipeline from Weld County, Colorado, to Audrain County, Missouri. The first long segment of this pipeline was commissioned on 27 December 2007, and the second long segment was commissioned on 16 May 2008. It is in full service since 16 May 2008. REX East (Zone 3) REX East is a long pipeline from Audrain County, Missouri, to Clarington in Monroe County, Ohio. In June 2014, REX placed the Seneca Lateral into initial service and in January 2015, the Seneca Lateral was placed into full service with the ability to move approximately onto the REX mainline in Zone 3. On August 1, 2015, REX placed its Zone 3 East-to-West Project into service, making Zone 3 of the mainline fully bi-directional with the ability to move approximately of Appalachian production to Midcontinent markets. The diameter of long pipeline system varies between , being primarily .The capacity of the pipeline is . It operates at a maximum allowable operating pressure of . The initial cost of the pipeline was around $5 billion. REX has filed with FERC for a expansion of its Zone 3 east-to-west capacity, via compression additions. This project is anticipated to be completed in Q4 2016. ==See also==