NuStar Energy LP was acquired by Sunoco LP in May 2023 in a transaction valued at approximately $7.3 billion enterprise value, retiring one of the most recognisable names in US independent midstream infrastructure after 17 years as a publicly traded master limited partnership. The NuStar brand was dissolved post-close, with its pipeline and terminal assets absorbed into the Sunoco LP and Energy Transfer network.
What Was NuStar Energy?
NuStar Energy traces its origins to the logistics assets of Ultramar Diamond Shamrock, which were contributed to form Valero L.P. following Valero Energy’s acquisition of Ultramar in 2001. The partnership was renamed NuStar Energy LP in 2006 and listed on the New York Stock Exchange under the ticker NS. It operated as a master limited partnership throughout its existence — a structure common among midstream operators that prioritises cash distribution to unitholders.
The company grew substantially through acquisition. The landmark deal was the 2005 purchase of Kaneb Pipe Line Partners, which added a major Gulf Coast and international terminal network and established NuStar as a top-tier independent operator. By the time of its sale, NuStar had spent nearly two decades building a diversified pipeline and storage business across the US Gulf Coast, Midwest, Pacific Coast, and Caribbean.
NuStar’s Terminal and Pipeline Network
At the time of acquisition, NuStar Energy operated approximately 10,000 miles of pipeline and around 63 terminal and storage facilities with combined capacity of roughly 57 million barrels, according to figures disclosed in NuStar’s SEC filings ahead of the transaction. That scale placed it among the larger independent US oil storage terminals operators in the country.
Key terminal assets included St. James, Louisiana — a major Gulf Coast crude hub positioned on one of the most active crude trading corridors in North America — alongside Three Rivers, Texas; Linden, New Jersey; and Selby, California. The geographic spread gave NuStar exposure to refined products movements across multiple US consuming regions. Pipeline systems included the Central West, Central East, and South Texas refined products systems.
The Ammonia Pipeline — NuStar’s Most Distinctive Asset
Among NuStar’s holdings, the most operationally distinctive was its ammonia pipeline system — approximately 2,000 miles of dedicated infrastructure running from Texas north to Minnesota, making it the only long-haul ammonia pipeline in the United States. The system served agricultural markets, moving anhydrous ammonia used as fertiliser across the US grain belt.
The pipeline originated with the Kaneb acquisition and represented a unique asset class within NuStar’s otherwise refined-products-focused portfolio. Its strategic value lay in the near-absence of alternative transport options for bulk ammonia at that scale — rail and truck cannot replicate pipeline economics for long-distance, high-volume fertiliser supply chains. The current operational status of the ammonia system under Sunoco and Energy Transfer ownership should be verified against post-acquisition disclosures, as pipeline asset dispositions are common following large midstream consolidations.
The $7.3bn Sunoco Acquisition
Sunoco LP (NYSE: SUN) announced the acquisition of NuStar Energy in January 2023, with the transaction closing in May 2023 at an enterprise value of approximately $7.3 billion, inclusive of assumed debt, per Sunoco LP’s investor announcements. Sunoco LP is itself a subsidiary of Energy Transfer LP (NYSE: ET), one of the largest midstream operators in North America, giving the deal a clear strategic rationale: NuStar’s refined products terminal network directly complemented Sunoco’s fuel distribution business.
For Energy Transfer, the transaction extended its midstream reach across additional US geographies without requiring greenfield construction. NuStar’s unitholders received Sunoco LP units as consideration. Following close, NuStar Energy LP was delisted from the NYSE, ending its run as an independent public entity. For context on the scale of the consolidated business, Kinder Morgan remains the benchmark for US pipeline and terminal scale — NuStar’s absorption into the Sunoco/Energy Transfer structure pushed that combined network further toward competing at the top tier of US midstream companies.
NuStar Assets in 2026 — What Happened Next
Following the May 2023 close, NuStar’s terminals, pipelines, and storage facilities were integrated into Sunoco LP’s operational structure under Energy Transfer’s broader portfolio. The NuStar brand was retired and no longer appears in public filings or investor materials as a distinct operating entity. St. James and the Gulf Coast terminal assets continue to operate as part of Sunoco’s refined products terminal business.
The refined products pipeline systems — Central West, Central East, South Texas — now move volumes within the Sunoco network, which distributes fuel to thousands of independent retail locations across the US. Energy Transfer’s scale means the former NuStar infrastructure is now one component of a much larger integrated midstream system rather than a standalone operator with its own commercial identity. For anyone researching NuStar Energy today, the operational assets remain active; the company itself does not.
Details on the current status of individual assets, including the ammonia pipeline, are disclosed in Sunoco LP investor relations filings and Energy Transfer’s annual reports to the SEC.
What happened to NuStar Energy?
NuStar Energy LP was acquired by Sunoco LP in May 2023 in a deal valued at approximately $7.3 billion enterprise value. The NuStar brand was retired after the transaction closed, and its pipeline and terminal assets were integrated into the Sunoco LP and Energy Transfer network.
Who acquired NuStar Energy and for how much?
Sunoco LP (NYSE: SUN), a subsidiary of Energy Transfer LP, acquired NuStar Energy for approximately $7.3 billion enterprise value, including assumed debt. The deal was announced in January 2023 and closed in May 2023.
What assets did NuStar Energy own before the acquisition?
At acquisition, NuStar Energy operated approximately 10,000 miles of pipeline, around 63 terminal and storage facilities, and roughly 57 million barrels of storage capacity. Key terminals included St. James, Louisiana; Three Rivers, Texas; Linden, New Jersey; and Selby, California.
What was NuStar’s ammonia pipeline and why was it significant?
NuStar operated approximately 2,000 miles of ammonia pipeline running from Texas to Minnesota — the only long-haul ammonia pipeline in the United States. It served agricultural markets by transporting anhydrous ammonia used as fertiliser across the US grain belt, with no equivalent pipeline alternative at that scale.
Are NuStar’s terminals still operating under Sunoco and Energy Transfer?
Yes. The former NuStar terminal and pipeline assets continue to operate as part of Sunoco LP’s refined products distribution network, which sits within Energy Transfer LP’s broader midstream portfolio. The NuStar brand no longer exists as a corporate or commercial entity.