Underground Salt Cavern Storage Infrastructure

Largest US midstream operator; holds the largest LPG/NGL salt cavern storage position at Mont Belvieu, Texas. Enterprise's Mont Belvieu complex includes dozens of solution-mined salt cavern storage cells in the Barbers Hill salt dome, holding hundreds of millions of barrels of NGL storage capacity. Also operates fractionation, pipelines, and marine export terminals at the same complex. Mont Belvieu's propane price is the global benchmark — Enterprise, as the largest storage operator, holds significant pricing influence over seasonal propane markets. Also operates the LOOP (Louisiana Offshore Oil Port) deepwater crude oil terminal.

Major US midstream partnership; holds NGL and LPG salt cavern storage at Mont Belvieu (Lone Star NGL/Energy Transfer). Also operates Mariner East pipeline system connecting Appalachian NGLs to Marcus Hook PA export terminal. Marcus Hook exports ~20% of US propane, requiring coordinated storage drawdown from Mont Belvieu caverns. Diverse midstream footprint: natural gas, crude oil (Dakota Access), NGLs, and refined products.

Major NGL midstream operator; holds significant NGL salt cavern storage at both Mont Belvieu, TX and Conway, KS (the two primary US NGL storage hubs). Conway, KS is the secondary US propane price benchmark hub (for Midcontinent propane) — ONEOK is the dominant storage and fractionation operator at Conway. Total NGL fractionation capacity 1M+ bpd. Acquired Magellan Midstream Partners (2023) for $18.8B, adding refined products infrastructure.

Major NGL midstream operator; holds NGL salt cavern storage at Mont Belvieu, TX. Targa's Grand Prix NGL pipeline brings Permian Basin NGL production to Mont Belvieu for fractionation and storage. 518,000 b/d fractionation capacity. Cedar Bayou Fractionator at Baytown TX was flooded during Hurricane Harvey 2017. The integrated storage-fractionation-export complex at Mont Belvieu represents the core of Targa's infrastructure value.

One of the largest energy infrastructure companies in North America; holds natural gas and NGL storage assets including salt cavern storage. Kinder Morgan's Products Pipelines segment operates refined products and NGL pipelines with associated storage. Also a leading operator of liquefied natural gas (LNG) facilities and CO2 pipelines for enhanced oil recovery. Less dominant in LPG salt cavern storage specifically vs. Enterprise/Energy Transfer/ONEOK, but holds meaningful storage capacity.