The WestOK operations consist of a gas gathering and processing system serving the Mississippi Lime shale and Anadarko basin in northwest Oklahoma and in southern Kansas. The system contains over 6,600 miles of gathering pipelines across eleven counties and the rich gas gathered is processed at four processing facilities with cumulative processing capacity of over 458 million cubic feet per day (MMCFD). The infrastructure also contains a significant number of gas compression assets located throughout the system.
The WestOK system has a total nameplate capacity of 458 MMcf/d with three separate cryogenic natural gas processing plants located at the Waynoka I and II and Chester facilities, and one refrigeration plant at the Chaney Dell facility.
The WestOK system has access to natural gas takeaway pipelines owned by affiliates of Enable Energy Transfer and Southern Star.
The following table lists the WestOk System processing plants and related volumes for the year ended December 31, 2018
(2) Gross processing capacity represents 100% of ownership interests and may differ from nameplate processing capacity due to multiple factors including items such as compression limitations, and quality and composition of the gas being procerssed. (3) Plant natural gas inlet represents the volume of natural gas passing through the meter located at the inlet of the natural gas processing plant, except for Badlands which represents the total wellhead gathered volume.
(4) Plant natural gas inlet and NGL production volumes represent 100% of ownership interests for our consolidated VESCO joint venture, Silver Oak II, Raptor, Coalgate, Stonewall, Tupelo, and Hickory Hills plants and our ownership share of volumes for other partially owned plants that we proportionately consolidate based on our ownership interest which may be adjustable subject to an annual redetermination based on our proportionate share of plant production.
(5) Per day Gross Plant Natural Gas Inlet and NGL Production statistics for plants listed above are based on the number of days operational during 2018.
(9) Certain processing facilities in these business units are capable of processing more than their nameplate capacity and when capacity is exceeded the facilities will off-load volumes to other processors, as needed. The gross plant natural gas inlet throughput volume includes these off-loaded volumes.
(10) Plant is idle.