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Acquisitions | 6 Months Ended
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Jun. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] |
Acquisitions | Acquisitions Ironwood Midstream Ironwood Midstream. On January 31, 2025, we acquired Ironwood Midstream Energy Partners II, LLC (“Ironwood Midstream”), which owns a gathering system in the Eagle Ford Basin, for approximately $481 million in cash from EnCap Flatrock Midstream. The Ironwood Midstream acquisition is accounted for in our Crude Oil segment. In January 2025, in a separate transaction, we also repurchased from EnCap Flatrock Midstream, a portion of our outstanding Series A preferred units. EnCap Flatrock Midstream is affiliated with EnCap Investments, L.P., an entity that is associated with a member of the board of directors of PAGP GP. See Note 7 for additional information. The Ironwood Midstream acquisition was accounted for as a business combination using the acquisition method of accounting. In accordance with applicable accounting guidance, the fair value of the assets acquired and liabilities assumed following the acquisition was utilized as the consideration transferred for the purchase price allocation. The determination of the fair value of the assets and liabilities assumed was estimated in accordance with applicable accounting guidance. The analysis was performed based on estimates that are reflective of market participant assumptions. The following table reflects our preliminary determination of the fair value of the Ironwood Midstream acquisition assets and liabilities (in millions):
Identifiable Assets Acquired and Liabilities Assumed: |  | Estimated Useful Lives (in years) |  | Recognized Amount
Property and equipment |  | 3-30 |  | $ | 435 |
Intangible assets |  | 16 |  | 27 |
Working capital and other assets and liabilities |  | N/A |  | 19 |
|  |  |  | $ | 481 |
The fair value of the tangible asset is a Level 3 measurement in the fair value hierarchy and was determined using a cost approach for tangible assets, which was based on costs incurred on similar recent construction projects, and a market approach for rights-of-way. A Level 3 measurement is one for which there are no observable market inputs. The fair value of the intangible assets is also a Level 3 measurement in the fair value hierarchy and was determined by applying a discounted cash flow approach. Such approach utilized a discount rate of 18%, based on our estimate of the risk that a theoretical market participant would assign to the intangible asset. The projection of future crude oil volumes transported and the estimated tariff rates for transportation were also key assumptions in the valuation of the intangible assets. Projected future volumes and estimated tariff rates were based on current contracts in place with assumptions for forecasted rate increases and contract renewals. The fair value of intangible asset is comprised of customer relationships that will be amortized over their useful lives, which have a remaining weighted average life of approximately 16 years. The value assigned to such intangible asset will be amortized to earnings under the declining balance method of amortization. Amortization expense was approximately $1 million and $2 million during the three and six months ended June 30, 2025, respectively, and the future amortization expense for the remainder of 2025 through 2029 is estimated as follows (in millions):
Remainder of 2025 |  |  |  | $ | 2 |
2026 |  |  |  | $ | 5 |
2027 |  |  |  | $ | 4 |
2028 |  |  |  | $ | 3 |
2029 |  |  |  | $ | 3 |
Pro forma financial information assuming the acquisition had occurred as of the beginning of the calendar year prior to the year of the acquisition, as well as the revenues and earnings generated during the period since the acquisition date, were not material for disclosure purposes. Other Acquisitions Medallion Midstream. In January 2025, we acquired EMG Medallion 2 Holdings, LLC and its subsidiaries, which own a crude oil gathering and transportation business in the Delaware Basin, for $163 million (approximately $106 million net to our 65% interest in the Permian JV), subject to certain adjustments. A cash deposit of approximately $16 million was paid upon signing in December 2024. The Medallion Midstream acquisition is accounted for in our Crude Oil segment. EMG Medallion 2 Holdings, LLC was a portfolio company of The Energy & Minerals Group (“EMG”), which is associated with a member of the board of directors of PAGP GP. Cheyenne Pipeline. In February 2025, through a non-monetary transaction, we acquired the remaining 50% interest in Cheyenne Pipeline LLC (“Cheyenne”) in exchange for the termination of certain obligations. The transaction resulted in a net gain of approximately $31 million, which represents the difference between the fair value of the entity and the historical book value of our investment. This gain is reflected in “Gain on investments in unconsolidated entities, net” on our Condensed Consolidated Statement of Operations. Prior to this transaction, our 50% interest in Cheyenne was accounted for as an equity method investment, reported in our Crude Oil segment. Black Knight Midstream. During the second quarter of 2025, we acquired Black Knight Midstream, LLC (“Black Knight Midstream”), which owns a crude oil gathering business in the Permian Basin, for $59 million (approximately $38 million net to our 65% interest in the Permian JV), subject to certain adjustments. The Black Knight Midstream assets are accounted for in our Crude Oil segment. BridgeTex Pipeline. In July 2025, we acquired an additional 20% interest in BridgeTex Pipeline Company, LLC (“BridgeTex”) for approximately $180 million. As a result of this transaction, we now own a 40% interest in BridgeTex and continue to account for our interest in BridgeTex, which is reported in our Crude Oil segment, as an equity method investment.

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- Definition The entire disclosure for business combinations, including leverage buyout transactions (as applicable), and divestitures. This may include a description of a business combination or divestiture (or series of individually immaterial business combinations or divestitures) completed during the period, including background, timing, and assets and liabilities recognized and reclassified or sold. This element does not include fixed asset sales and plant closings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/205-20/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/805/tableOfContent + Details
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