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We consent to the incorporation by reference in the registration statements on Form S-8 (No. 333-209717, 333-226279 and 333-231004) and on Form S-3 (No. 333-232502 and 333-230823) of NuStar Energy L.P. of our reports dated February 25, 2021, with respect to the consolidated balance sheets of NuStar Energy L.P. as of December 31, 2020 and 2019, and the related consolidated statements of (loss) income, comprehensive (loss) income, partners’ equity and mezzanine equity, and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes (collectively, the consolidated financial statements), and the effectiveness of internal control over financial reporting as of December 31, 2020, which reports appear in the December 31, 2020 annual report on Form 10‑K of NuStar Energy L.P.