Southwest Segment
In this segment, we gather, process, treat, fractionate and transport off-gas as well as natural gas and natural gas liquids in East Texas, Southeast Oklahoma, Western Oklahoma, Gulf Coast and several smaller systems in the Southwest.

East Texas
Our East Texas operations are located in Panola, Harrison, and Rusk Counties and serve the Carthage Field. The midstream system consists of low and high pressure natural gas gathering pipelines, centralized compressor stations, a natural gas processing facility, and an NGL pipeline.
|
Resource Plays |
Cotton Valley, Travis Peak, and Pettit formations and Haynesville Shale |
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Gathering |
640 MMcf/d gathering capacity |
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Processing |
400 MMcf/d cryogenic processing capacity |
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Market Access |
Gas: Interconnects to CenterPoint Energy Gas Transmission (CEGT), Natural Gas Pipeline Company of America (NGPL), and TGT Pipeline NGLs: Interconnects to West Texas Pipeline (WTPL) and Panola Pipeline |

Western Oklahoma
We own the Foss Lake natural gas gathering system and the Arapaho natural gas processing complex, all located in Roger Mills, Custer, and Ellis Counties of western Oklahoma. We also own a gathering system in the Granite Wash formation in the Texas panhandle and the Grimes gathering system in Roger Mills and Beckham Counties in western Oklahoma, both of which are connected to our Arapaho processing plants.
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Resource Plays |
Anadarko Basin and the Granite Wash formation |
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Gathering |
340 MMcf/d gathering capacity |
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Processing |
235 MMcf/d cryogenic processing capacity |
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Market Access |
Gas: Interconnects to ANR Pipeline System (ANR), CenterPoint Energy Gas Transmission (CEGT), Natural Gas Pipeline Company of America (NGPL), and Panhandle Eastern Pipeline (PEPL) NGLs: Interconnect to OneOK |

Southeast Oklahoma
We own a natural gas gathering system in the Woodford Shale in the Arkoma Basin of southeast Oklahoma. We have in excess of 160,000 dedicated acres in the Woodford Shale play and the Hartshorne coal bed methane play where we provide low pressure, highly reliable, and fuel efficient service.
|
Resource Play |
Woodford Shale |
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Gathering |
550 MMcf/d gathering capacity |
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Processing |
100 MMcf/d of third-party, rich-gas processing capacity |
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Market Access |
Gas: Interconnects to CenterPoint Energy Gas Transmission (CEGT), CenterPoint Field Services (CPFS), Enogex, and Arkoma Connector Pipeline |
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Transportation |
625 MMcf/d FERC-regulated Arkoma Connector Pipeline (joint venture with ArcLight Capital Partners). Interconnects to Midcontinent Express Pipeline (MEP) and Gulf Crossing Pipeline at Bennington, Oklahoma |
Under Construction |
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|
Processing |
120 MMcf/d processing plant expansion of Centrahoma, a joint venture between MarkWest and Atlas Pipeline Partners, L.P. |

Other Southwest
We own a number of natural gas gathering systems and intrastate piplines located throughout Texas, Louisiana, and New Mexico; including the Appleby gathering system in Nacogdoches County, Texas. In many areas we are the primary gatherer, and in some of the areas served by our smaller systems we are the sole gatherer.
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Resource Plays |
Travis Peak, Rodessa, Frio, Ellenburger, and Canyon Sand formations, as well as Haynesville and Bossier Shales |
|
Gathering |
122 MMcf/d gathering capacity |
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Processing |
100 MMcf/d processing capacity |
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Market Access |
Interconnects to multiple downstream pipelines, including Natural Gas Pipeline Company of America (NGPL) |
|
Transportation |
Three lateral natural gas pipelines in Texas with a combined capacity of approxmately 500 MMcf/d FERC-regulated, natural gas pipline in New Mexico with a capacity of approximately 275 MMcf/d |

Gulf Coast
Gulf Coast consists of the Javelina gas processing and fractionation facility in Corpus Christi, Texas, which treats, processes, and fractionates off-gas from six local crude oil refineries.
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Processing |
142 MMcf/d cryogenic processing capacity |
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Fractionation |
29,000 Bbl/d NGL fractionation capacity |
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Market Access |
Gas: Interconnects to several local refineries NGLs: Interconnects to various regional product pipelines |
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Other |
NGL marketing and transportation, including ethane, ethylene, propane, propylene, isobutane, normal butane, butylenes, and pentanes High-purity hydrogen production |
