The WestTX gathering system has approximately 4,500 miles of natural gas gathering pipelines located across nine counties within the Permian Basin in West Texas. We have an approximate 72.8% ownership in the WestTX system. Pioneer, the largest active driller in the Spraberry and Wolfberry Trends and a major producer in the Permian Basin, owns the remaining interest in the WestTX system. The WestTX system includes six separate plants: the Consolidator, Driver, Midkiff, Benedum, Edward and Buffalo processing facilities. The WestTX processing operations currently have an aggregate processing nameplate capacity of 875 MMcf/d.

Two additional plants in the Permian Basin are currently under construction: 1) the 200 MMcf/d Joyce Plant, which is expected to be completed in the first quarter of 2018, and 2) the 200 MMcf/d Johnson Plant, which is expected to begin operations in the third quarter of 2018. In addition, two recently announced 250 MMcf/d plants are expected to begin operations in the first and third quarters of 2019, respectively.
The WestTX system has access to natural gas takeaway pipelines owned by affiliates of Atmos; Kinder Morgan; ONEOK; Enterprise; and Northern.
The following table lists the West Texas Gathering & Processing plants and related volumes for the year ended December 31, 2017



(1) 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 processed. 

(2) 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.
(3) Per day Gross Plant Natural Gas Inlet and NGL Production statistics for plants listed above are based on the number of days operational during 2017. 
(4) Gross plant natural gas inlet throughput volumes and gross NGL production volumes for WestTX are presented on a pro-rata net basis representing our undivided ownershipinterest in WestTX, which we proportionately consolodate in our financial statements.