The natural gas pipelines segment operates interstate and intrastate natural gas transmission pipelines, natural gas storage facilities and non-processable natural gas gathering facilities.

Our interstate natural gas pipeline assets transport natural gas through FERC-regulated interstate natural gas pipelines in Montana, North Dakota, South Dakota, Minnesota, Wisconsin, Iowa, Illinois, Indiana, Kentucky, Tennessee, Oklahoma, Texas and New Mexico. Our pipelines include Midwestern Gas Transmission, Guardian Pipeline, Viking Gas Transmission, and OkTex Pipeline. We own approximately 1,290 miles of transmission pipeline with approximately 2.4 Bcf/d of peak transportation capacity. We also own a 50 percent interest in Northern Border Pipeline.

Our intrastate natural gas pipeline assets in Oklahoma have access to the major natural gas producing areas and transport natural gas throughout the state. We also have access to the major natural gas producing area in south central Kansas. In Texas, our intrastate natural gas pipelines are connected to the major natural gas producing areas in the Texas panhandle and the Permian Basin and transport natural gas to the Waha Hub, where other pipelines may be accessed for transportation east to the Houston Ship Channel market, north into the Mid-Continent market and west to the California market. Our assets include more than 5,600 miles of intrastate natural gas gathering and state-regulated intrastate transmission pipelines with peak transportation capacity of approximately 2.9 Bcf/d.

Our underground natural gas storage operations include 11 facilities in Oklahoma, Kansas and Texas, with active capacity totaling 51.6 Bcf.

The natural gas pipelines segment includes the following:

• Interstate Natural Gas Pipelines
  • Midwestern Gas Transmission Company
  • Viking Gas Transmission Company
  • Guardian Pipeline, L.L.C.
  • OkTex Pipeline Company
  • 50% interest in Northern Border Pipeline Company
• Intrastate Natural Gas Pipelines and Storage
  • ONEOK Gas Transportation, L.L.C.
  • ONEOK Gas Gathering, L.L.C.
  • ONEOK Gas Storage, L.L.C.
  • ONEOK WesTex Transmission, L.P.
  • ONEOK Texas Gas Storage, L.P.
  • Mid Continent Market Center