Rockies Express Pipeline

Rockies Express Pipeline (REX) is one of the United States’ largest pipelines and is transforming into the nation’s northernmost bi-directional natural gas header system. With 42- and 36-inch diameter lines, REX taps major supply basins in the Rocky Mountain and Appalachian regions and serves energy markets across a vast segment of North America. REX is owned by Tallgrass Energy (75 percent) and Phillips 66 (25 percent).

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REX became fully operational in 2009 and stretches about 1,700 miles between northwestern Colorado and Wyoming and eastern Ohio. Through numerous interstate pipeline interconnects, the pipeline provides shippers diverse access to many major demand centers and large end-users. In addition, REX’s access to directly connected load (power plants, LDCs, industrial) has grown substantially from 1.4 Bcf/d to over 2.7 Bcf/d and realized peak flows of more than 1 billion cubic feet per day (Bcf/d). REX has a west-to-east long-haul capacity of 1.8 Bcf/d from Rockies receipts to Zone 3 deliveries and an east-to-west capacity of 2.6 Bcf/d from Appalachian region receipts to Zone 3 deliveries, enabling REX to deliver up to 4.4 billion cubic feet per day in Zone 3.

The completion of the REX Cheyenne Hub Enhancement project in June 2020 allows REX, for the first time in its history, to receive up to about 1 Bcf/d of natural gas from the Denver-Julesburg and Powder River production basins through interconnecting pipelines at the REX Cheyenne Hub. This includes 600 MMcf/d from the Cheyenne Connector pipeline, which also was placed in service in June 2020. Natural gas connecting to the REX Cheyenne Hub can then be transported to numerous demand markets across the country on REX, via its 1.8 Bcf/d west-to-east capacity, and through downstream interconnected pipelines.

The completion of the REX Zone 3 Capacity Enhancement project in January 2017 marked the culmination of a series of projects to convert Zone 3 to bi-directional flow, including the Seneca Lateral project in 2014 and the REX Zone 3 East-to-West project in 2015. Together, these projects created 2.6 Bcf/d of east-to-west capacity and answered the call for more takeaway capacity from the Marcellus and Utica shale plays in the Appalachian basin. REX continues to provide an essential outlet for Appalachian producers to move their gas to Midwest consumer markets such as Chicago and Detroit, as well as to the Southeast and Gulf Coast areas.

For local distribution companies, industrial customers, power plants, and third-party pipelines, the historically connected Rockies production basins combined with the Cheyenne Hub Enhancement and Zone 3 bi-directional and enhancement projects, mean access to abundant natural gas sources in both the Rockies and Appalachian basins. As the country’s northernmost bi-directional header system, REX will play a crucial role in transforming the nation’s natural gas infrastructure, providing access to emerging U.S. markets as well as access to current high-demand centers, power demand, LNG markets and Mexico.


For business development on new services and facilities:

  • Illinois, Indiana, and Ohio contact  Doug Walker (815) 464-1617
  • Missouri, Kansas, Nebraska, Colorado and Wyoming contact  Len Mize (303) 763-3218

For Marketing Information, contact:

For pipeline scheduling:

  • Scheduling Hotline: (303) 763-2906

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