Western Midstream Partners LP

The following sections describe in more detail the services provided by our assets in our areas of operation as of December 31, 2023.

GATHERING, PROCESSING, TREATING, AND DISPOSAL

Overview - Texas and New Mexico

(1)Includes 215 MMcf/d of bypass capacity at the West Texas complex.

(2)Includes owned and leased compressors and compression horsepower.

(3)Includes 19 miles of transportation related to the residue lines (regulated by FERC) at the West Texas complex and 15 miles of transportation related to a crude-oil pipeline at the DBM oil system.

(4)The West Texas complex includes the DBM complex, DBJV and Haley systems, and the Ranch Westex processing plant.

(5)The DBM oil system includes three central production facilities and two Regional oil treating facilities.

(6)We own a 50% interest in Mi Vida, which owns a processing plant operated by a third party.

(7)We own a 25% interest in the Mont Belvieu JV, which owns two NGLs fractionation trains. A third party serves as the operator.

(8)We own a 50.1% interest in the Springfield system and serve as the operator.

West Texas and New Mexico

West Texas gathering, processing, and treating complex

•Customers. For the year ended December 31, 2023, Occidental’s production represented 42% of the West Texas complex throughput, and the two largest third-party customers provided 32% of the throughput.

•Supply. Supply of gas and NGLs for the complex comes from production from the Delaware Sands, Avalon Shale, Bone Spring, Wolfcamp, and Penn formations in the Delaware Basin portion of the Permian Basin.

•Delivery points. Gas is dehydrated, compressed, and delivered to the Mi Vida plant (see below) and within the West Texas complex for processing, while lean gas is delivered into Enterprise GC, L.P.’s pipeline for ultimate delivery into Energy Transfer LP’s (“ET”) Oasis pipeline (the “Oasis pipeline”). Residue gas from the West Texas complex is delivered to the Red Bluff Express pipeline, Whitewater Midstream, LLC’s Agua Blanca pipeline, Oasis pipeline, Transwestern Pipeline Company LLC’s pipeline (“Transwestern pipeline”), and Kinder Morgan, Inc.’s interstate pipeline system. NGLs production is primarily delivered into the Sand Hills pipeline and Lone Star NGL LLC’s pipeline (“Lone Star pipeline”).

•Mentone Train III. WES is currently constructing a third cryogenic processing train at the Mentone processing plant within the West Texas complex. Mentone Train III will have a capacity of 300 MMcf/d, and WES expects this train to be completed at the end of the first quarter of 2024. Upon completion of Mentone Train III, the West Texas complex will have a total processing capacity of 1,940 MMcf/d.

•North Loving Plant. WES is currently constructing a new cryogenic processing plant in the North Loving area of our West Texas complex. The North Loving Plant will have a capacity of 250 MMcf/d, and WES expects this plant to be completed in the first quarter of 2025.

DBM oil-gathering system, treating facilities, and storage

•Customers. As of December 31, 2023, DBM oil system throughput was from Occidental and one third-party producer. For the year ended December 31, 2023, Occidental’s production represented 98% of the total DBM oil system throughput and is subject to the Texas Railroad Commission tariff.

•Supply. The DBM oil system is supplied from production from the Delaware Basin portion of the Permian Basin.

•Delivery points. Crude oil treated at the DBM oil system is delivered into Plains All American Pipeline.

DBM produced-water disposal systems

•Customers. As of December 31, 2023, DBM water systems throughput was from Occidental and numerous third-party producers, with Occidental’s production representing 78% of the throughput.

•Supply. Supply of produced water for the systems comes from crude-oil production from the Delaware Basin portion of the Permian Basin.

•Disposal. The DBM water systems gather and dispose produced water via subsurface injection or offload to third-party service providers. The systems’ injection wells are located in Loving, Reeves, and Ward Counties in Texas.

Mi Vida processing plant

•Customers. As of December 31, 2023, Mi Vida plant throughput was from Occidental and one third-party customer.

•Supply and delivery points. The Mi Vida plant receives volumes from the West Texas complex and ET’s gathering system. Residue gas from the Mi Vida plant is delivered to the Oasis pipeline or Transwestern pipeline. NGLs production is delivered to the Lone Star pipeline.

East Texas

Mont Belvieu JV fractionation trains

•Customers. The Mont Belvieu JV does not contract with customers directly but is allocated volumes based on available capacity and the allocation structure set forth in the Operating Agreement between Mont Belvieu JV and Enterprise Products Operating, LLC.

•Supply and delivery points. Enterprise Products Partners L.P. (“Enterprise”) receives volumes at its fractionation complex in Mont Belvieu, Texas via a large number of pipelines, including Skelly-Belvieu Pipeline Company, LLC’s pipeline, TEP’s pipeline, and the Panola pipeline (see Transportation within these Items 1 and 2). NGLs are delivered to end users either through customer-owned pipelines that are connected to nearby petrochemical plants or via export terminals.

South Texas

Brasada gathering, stabilization, treating, and processing complex

•Customers. For the year ended December 31, 2023, Brasada complex throughput was from two third-party customers.

•Supply. Supply of gas and NGLs is sourced from throughput gathered by the Springfield system.

•Delivery points. The facility delivers residue gas to the Eagle Ford Midstream system operated by NET Midstream, LLC. Stabilized condensate is delivered to Plains All American Pipeline, and NGLs are delivered to the Enterprise-operated South Texas NGL Pipeline System.

Springfield gathering system, stabilization facility, and storage

•Customers. For the year ended December 31, 2023, Springfield system throughput was from multiple third-party customers.

•Supply. Supply of gas and oil is sourced from third-party production in the Eagle Ford Shale Play.

•Delivery points. The gas-gathering system has a delivery point to our Brasada complex and other interruptible points (the Raptor processing plant owned by Carnero G&P LLC and operated by Targa Resources Corp. and the Dos Hermanos plant owned and operated by ET). The oil-gathering system delivers oil to Plains All American Pipeline, Kinder Morgan, Inc.’s Double Eagle Pipeline, Hilcorp Energy Company’s Harvest Pipeline, and NuStar Energy L.P.’s Pipeline.

Overview - Rocky Mountains - Colorado and Utah

(1)Includes 200 MMcf/d of bypass capacity at the DJ Basin complex.

(2)Includes 12 miles of transportation related to a crude-oil pipeline at the DJ Basin oil system.

(3)The DJ Basin complex includes the Platte Valley, Fort Lupton, Wattenberg, Lancaster Trains I and II, and Latham Trains I and II processing plants, and the Wattenberg gathering system.

(4)We are the managing member of and own a 75% interest in Chipeta, which owns the Chipeta processing complex.

Colorado

DJ Basin gathering, treating, and processing complex

•Customers. For the year ended December 31, 2023, Occidental’s production represented 51% of the DJ Basin complex throughput, and the two largest third-party customers provided 34% of the throughput.

•Supply. The DJ Basin complex is supplied primarily by the Wattenberg field.

•Delivery points. As of December 31, 2023, the DJ Basin complex had various delivery-point interconnections with DCP Midstream LP’s (“DCP”) gathering and processing system for gas not processed within the DJ Basin complex. The DJ Basin complex is connected to the Colorado Interstate Gas Company LLC’s pipeline (“CIG pipeline”), Tallgrass Energy’s Cheyenne Connector pipeline, and Xcel Energy’s residue pipelines for natural-gas residue takeaway and to Overland Pass Pipeline Company LLC’s pipeline, FRP’s pipeline, and DCP’s Wattenberg NGL pipeline for NGLs takeaway. In addition, the NGLs fractionators and associated truck-loading facility at the Platte Valley and Wattenberg plants provides access to local NGLs markets.

DJ Basin oil-gathering system, stabilization facility, and storage

•Customers. For the year ended December 31, 2023, all of the DJ Basin oil system throughput was from Occidental’s production.

•Supply. The DJ Basin oil system, which is supplied primarily by the Wattenberg field, gathers high-vapor-pressure crude oil and delivers it to the centralized oil stabilization facility (“COSF”). The COSF includes two 250,000 barrel crude-oil storage tanks.

•Delivery points. The COSF has market access to the White Cliffs pipeline, Saddlehorn pipeline, Tallgrass Energy’s Pony Express pipeline and rail-loading facilities in Tampa, Colorado, and local markets.

Utah

Chipeta processing complex

•Customers. For the year ended December 31, 2023, Chipeta complex throughput was from numerous third-party customers, with the two largest customers providing 71% of the throughput.

•Supply. Chipeta’s inlet is connected to Caerus Oil and Gas LLC’s Greater Natural Buttes gathering system, the MountainWest Pipeline, LLC system (“MountainWest Pipeline”), and Three Rivers Gathering, LLC’s system, which is owned by MPLX LP (“MPLX”).

•Delivery points. The Chipeta plant delivers NGLs via the GNB NGL pipeline to Enterprise’s Mid-America Pipeline Company pipeline (“MAPL pipeline”), which provides transportation through Enterprise’s Seminole pipeline (“Seminole pipeline”) and TEP’s pipeline in West Texas, and ultimately to the NGLs fractionation and storage facilities in Mont Belvieu, Texas. The Chipeta plant has residue gas delivery points through the CIG pipeline, MountainWest Pipeline, and Wyoming Interstate Company’s pipeline (“WIC pipeline”) that deliver residue gas to markets throughout the Rockies and Western United States.

•Expansion activity. Additional compression is in the process of being installed at the Chipeta complex, which will allow for up to 100 MMcf/d of incremental inlet gas via MountainWest Pipeline and is expected to be in service in July 2024.

Overview - Rocky Mountains - Wyoming

(1)Includes 120 miles of transportation related to a FERC-regulated NGL pipeline at the Powder River Basin complex.

(2)The Powder River Basin complex includes the Hilight system and assets acquired from Meritage (Steamboat and 50 Buttes gas-processing plants, Buckshot amine plant, Thunder Creek gathering system, and Thunder Creek NGL pipeline).

(3)We have a 22% interest in the Rendezvous gathering system, which is operated by a third party.

Northeast Wyoming

Powder River Basin gathering, processing, and treating complex

The Powder River Basin complex includes the Hilight system and assets acquired with the closing of the Meritage acquisition in October 2023. See Acquisitions and Divestitures within these Items 1 and 2.

•Customers. For the year ended December 31, 2023, gas gathered and processed at the Powder River Basin complex was from numerous third-party customers, with the largest customer providing 36% of the system throughput.

•Supply. The Powder River Basin complex serves the gas-gathering needs of several conventional producing fields in Converse, Campbell, Johnson, and Natrona Counties, Wyoming.

•Delivery points. The Hilight plant delivers residue gas to our MIGC transmission line (see Transportation within these Items 1 and 2). Hilight is not connected to an active NGLs pipeline, resulting in all fractionated NGLs being sold locally through truck and rail loading facilities. The Steamboat and 50 Buttes gas-processing plants deliver natural gas to the Thunder Creek and Chalk Buttes delivery points owned by Wyoming Interstate Company (“WIC”), a subsidiary of Kinder Morgan, Inc. The NGLs from the Steamboat and 50 Buttes gas-processing plants, as well as EOG’s Jewell gas-processing plant, are delivered via our Thunder Creek NGL pipeline to ONEOK, Inc.’s Well Draw delivery point.

Southwest Wyoming

Granger gathering system

The Granger processing plant was shut down in December 2023. The gathering system continues to be operational, and gas gathered by the system is delivered to a third party for processing.

•Customers. For the year ended December 31, 2023, Granger complex throughput was from third-party customers, with the two largest customers providing 77% of the throughput.

•Supply. The Granger complex is supplied by the Moxa Arch and the Jonah and Pinedale Anticline fields.

•Delivery points. Residue gas from the Granger complex is delivered to a third party for processing and can then be delivered to the CIG pipeline; The Williams Companies, Inc.’s MountainWest Pipeline, Overthrust Pipeline, and Northwest Pipeline (“NWPL”); our OTTCO pipeline; and our Mountain Gas Transportation LLC pipeline. The NGLs have market access to the MAPL pipeline, which terminates at Mont Belvieu, Texas, and other local markets.

Red Desert gathering system

•Customers. For the year ended December 31, 2023, Red Desert complex throughput was from third-party customers, with the three largest customers providing 59% of the throughput.

•Supply and delivery points. The Red Desert complex gathers and compresses natural gas produced from the eastern portion of the Greater Green River Basin and delivers to a third party for processing.

Rendezvous gathering system

•Customers. For the year ended December 31, 2023, Rendezvous system throughput primarily was from two shippers that have dedicated acreage to the system.

•Supply and delivery points. The Rendezvous system provides high-pressure gathering service for gas from the Jonah and Pinedale Anticline fields and delivers to MPLX’s Blacks Fork gas-processing plant, which connects to the MountainWest Pipeline, NWPL, and the Kern River pipeline via the Rendezvous pipeline.

Overview - North-central Pennsylvania

(1)We own a 33.75% interest in the Marcellus Interest gathering systems.

Marcellus gathering systems

•Customers. As of December 31, 2023, the Marcellus Interest gathering systems had two priority shippers. The largest producer provided approximately 89% of the throughput for the year ended December 31, 2023. Capacity not used by priority shippers is available to other third parties as determined by the operating partner, a subsidiary of EQT Corporation.

•Supply and delivery points. The Marcellus Interest gathering systems have access to Transcontinental Gas Pipe Line Company, LLC’s pipeline.

TRANSPORTATION

(1)Regulated by FERC.

(2)Operated by a third party.

Rocky Mountains - Colorado

White Cliffs pipeline. The White Cliffs dual pipeline system had multiple committed shippers, including Occidental, as of December 31, 2023. Other parties may also ship on the White Cliffs pipeline at FERC-based rates. The pipeline provides crude-oil and NGL takeaway capacity from Platteville, Colorado, to ET’s storage facility in Cushing, Oklahoma, which ultimately delivers to Gulf Coast and mid-continent refineries. It is supplied by production from the DJ Basin. At the point of origin, there is a storage facility adjacent to a truck-unloading facility.

Saddlehorn pipeline. The Saddlehorn pipeline had multiple committed shippers, including Occidental, as of December 31, 2023. Other parties may also ship on the Saddlehorn pipeline at FERC-based rates. The pipeline has multiple origin points including: Cheyenne and Ft. Laramie, Wyoming, and Carr and Platteville, Colorado. Saddlehorn is supplied by the DJ Basin and basins that connect to a Wyoming access point. The pipeline delivers crude oil and condensate to storage facilities in Cushing, Oklahoma.

Rocky Mountains - Utah

GNB NGL pipeline. There were three primary shippers on the GNB NGL pipeline as of December 31, 2023. The GNB NGL pipeline provides capacity at the posted FERC-based rates and has the ability to receive NGLs from Chipeta’s gas-processing facility and MPLX’s Stagecoach/Iron Horse gas-processing complex. The GNB NGL pipeline delivers NGLs to the MAPL pipeline, which provides transportation through the Seminole pipeline and TEP’s pipeline, and ultimately to NGLs fractionation and storage facilities in Mont Belvieu, Texas.

Rocky Mountains - Wyoming

MIGC transportation system. For the year ended December 31, 2023, throughput on the MIGC system was from numerous third-party customers, with the two largest customers providing 80% of the system throughput. All parties on the MIGC system ship pursuant to a tariff on file with FERC. The system receives gas from the Hilight system, EOG’s Jewell plant, and from WBI Energy Transmission, Inc. MIGC volumes can be redelivered to the hub in Glenrock, Wyoming, which has access to interstate pipelines including the CIG pipeline, Tallgrass Interstate Gas Transmission pipeline, and WIC pipeline. Volumes can also be delivered to Black Hills Corporation’s Cheyenne Light Fuel & Power and several industrial users.

OTTCO transportation system. For the year ended December 31, 2023, throughput on the OTTCO transportation system was from numerous third-party shippers. Revenues on the system are generated from contracts that contain minimum-volume commitments and volumetric fees paid by shippers under firm and interruptible gas-transportation agreements. Supply points include approximately 30 active wellheads, the Granger complex, and ExxonMobil Corporation’s Shute Creek plant, which are supplied by the eastern portion of the Greater Green River Basin, the Moxa Arch, and the Jonah and Pinedale Anticline fields. Primary delivery points include the Red Desert complex, two third-party industrial facilities, and an inactive interconnection with the Kern River pipeline.

Wamsutter pipeline. For the year ended December 31, 2023, 96% of the Wamsutter pipeline throughput was from one third-party shipper. Revenues on the pipeline are generated from tariff-based rates regulated by the Wyoming Public Service Commission. The Wamsutter pipeline has active receipt points in Sweetwater County, Wyoming, and delivers crude oil to MPLX LP’s SLC Core Pipeline System.

Texas

Front Range Pipeline. FRP provides NGLs takeaway capacity from the DJ Basin in Northeast Colorado. FRP has receipt points at gas plants in Weld and Adams Counties, Colorado (including the DJ Basin complex) (see Rocky Mountains—Colorado and Utah within these Items 1 and 2). FRP connects to TEP near Skellytown, Texas. As of December 31, 2023, the pipeline had multiple committed shippers, including Occidental. FRP provides capacity to other shippers at the posted FERC tariff rate.

Texas Express Gathering. TEG consists of two NGLs gathering systems that provide plants in North Texas and the Texas panhandle with access to NGLs takeaway capacity on TEP. TEG had one committed shipper as of December 31, 2023.

Texas Express Pipeline. TEP delivers to Enterprise’s NGL fractionation and storage facility in Mont Belvieu, Texas. TEP is supplied with NGLs from other pipelines or systems including FRP, the MAPL pipeline, and TEG. As of December 31, 2023, the pipeline had multiple committed shippers, including Occidental. TEP provides capacity to other shippers at the posted FERC tariff rates.

Whitethorn. Whitethorn is supplied by production from the Permian Basin. Whitethorn transports crude oil and condensate from Enterprise’s Midland terminal to Enterprise’s Sealy terminal and connects with Enterprise’s Rancho II pipeline in Sealy to deliver into ECHO storage and greater Houston market. Shippers have access to refineries in Houston, Texas City, Beaumont, and Port Arthur, Texas, and Enterprise’s crude-oil export facilities.

Panola pipeline. The Panola pipeline transports NGLs from Panola County, Texas, to Mont Belvieu, Texas. As of December 31, 2023, the Panola pipeline had multiple committed shippers. The pipeline provides capacity to other shippers at the posted FERC-based rates.

Red Bluff Express pipeline. As of December 31, 2023, the Red Bluff Express pipeline had multiple committed shippers, including Occidental. The pipeline also provides capacity to other shippers at the posted FERC-based rates. In December 2020, WES entered into a five-year transportation contract, which became effective on January 1, 2021, with a volume commitment on the Red Bluff Express pipeline. The pipeline is supplied by production from our West Texas complex and other third-party plants. The Red Bluff Express pipeline transports natural gas from Reeves and Loving Counties, Texas, to the WAHA hub in Pecos County, Texas.