Midstream Gas and Liquids

Williams Partners’ Willow Creek facility in the Piceance Basin of western Colorado can produce up to 450 million cubic feet per day of natural gas and produce 30,000 barrels per day of natural gas liquids.

Williams Partners’ midstream assets make it one of the nation’s largest natural gas gatherers and processors. The partnership’s large-scale midstream assets are concentrated in major producing basins in Colorado, New Mexico, Wyoming, the Gulf of Mexico, and the Marcellus Shale in Pennsylvania. These assets provide natural gas gathering, treating, and processing; natural gas liquid (NGL) fractionation, storage and transportation; and oil transportation.

Williams Partners’ major midstream assets, by region, include:

Rocky Mountain and Mid-continent area:

  • Approximately 3,500 miles of gathering pipelines with a capacity of nearly 1 billion cubic feet per day (Bcf/d) and more than 4,000 receipt points serving the Wamsutter and southwest Wyoming areas
  • The Opal and Echo Springs processing plants in Wyoming, which have a combined daily inlet capacity of more than 2.2 billion Bcf/d of natural gas and nearly 125,000 barrels per day (bpd) of NGL production capacity
  • The Willow Creek processing plant in Western Colorado, which has processing capacity of 450 million cubic feet per day (MMcfd) and NGL production capacity of 30,000 bpd
  • The Parachute Plant Complex and three other treating facilities in western Colorado with a combined processing capacity of 1.2 Bcfd.  These facilities are connected to more than 3,300 wells via a gathering system with approximately 150 miles of pipeline, ranging up to 30-inch trunk lines
  • The Parachute Lateral, a 38-mile, 30-inch diameter line transporting gas from the Parachute area to the Greasewood hub and White River hub in northwest Colorado
  • PGX Pipeline, a pipeline that transports NGLs from the Parachute area to a major NGL transportation pipeline system
  • 50% ownership interest in the Overland Pass Pipeline Company, which includes a 760-mile NGL pipeline from Opal, Wyo., to the Mid-Continent NGL market center in Conway, Kan., along with 150- and 125-mile extensions into the Piceance and Denver-Julesburg Basins in Colorado, respectively. ONEOK Partners owns the other 50%; Williams operates the assets
  • The Four Corners system in New Mexico and Colorado, which is comprised of 3,800 miles of gathering lines, 6,500 receipt points and five natural gas processing and/or treating plants.  The plants have the combined capacity to process and treat approximately 1.5 Bcfd of natural gas and to produce 41,000 bpd of NGLs
  • The Mid-Continent Fractionation and Storage complex near Conway, Kan., which consists of a network of interconnected underground caverns that hold large volumes of NGLs and other hydrocarbons and have an aggregate capacity of approximately 20 million barrels

Gulf Coast area:

  • Approximately 800 miles of onshore and offshore natural gas gathering pipelines with a combined capacity of approximately 3.7 Bcf/d
  • The Mobile Bay and Markham processing plants with a combined inlet capacity of 1.2 Bcf/d and NGL production capacity of 75,000 barrels per day
  • Four deepwater crude oil pipelines with a combined length of nearly 400 miles and capacity of 475 million barrels per day (MMbbls/d)
  • Two floating production platforms with combined daily inlet capacity of 710 MMcf/d of natural gas and 60 MMbbls/d of oil
  • The Geismar olefins production facility, which annually produces approximately 1.3 billion pounds of ethylene and 90 million pounds of polymer grade propylene.  A significant expansion is underway at Geismar that will increase the facility’s ethylene production capacity by 600 million pounds per year to a new annual capacity of 1.95 billion pounds.
  • A refinery-grade propylene splitter and approximately 200 miles of olefin and NGL transportation pipelines.

Marcellus Shale area:

    • The Susquehanna Supply Hub in northeast Pennsylvania is a major natural gas supply hub being built to serve natural gas producers in northeastern Pennsylvania.  The system currently has a gathering inlet capacity of approximately 1 Bcf/d and is connected to three major interstate gas pipeline systems.
    • The Ohio Valley Midstream system in northern West Virginia, southwestern Pennsylvania and eastern Ohio is situated in the NGL-rich heart of the Marcellus Shale.  Current assets include a gathering system and a processing facility.  In addition, construction is underway on fractionation and additional processing facilities and there are plans to construct natural gas liquid (NGL) pipelines.
    • The Laurel Mountain Midstream joint venture1 in southwestern Pennsylvania currently includes nearly 1,400 miles of pipeline with average throughput of 200 MMcf/d.
    • By 2015, Williams Partners expects to be gathering 5 Bcf/d in the Marcellus Shale. 

    1 Williams Partners owns 51 percent of Laurel Mountain Midstream and operates it. Chevron is the JV partner and owns the remaining 49 percent.
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