Exhibit 32.01

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of NuStar Energy L.P. (the Partnership) on Form 10-K for the year ended December 31, 2009, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Curtis V. Anastasio, President and Chief Executive Officer of NuStar GP, LLC, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

A signed original of the written statement required by Section 906 has been provided to NuStar Energy L.P. and will be retained by NuStar Energy L.P. and furnished to the Securities and Exchange Commission or its staff upon request.

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of NuStar Energy L.P. (the Partnership) on Form 10-K for the year ended December 31, 2009, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Steven A. Blank, Senior Vice President, Chief Financial Officer and Treasurer of NuStar GP, LLC, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

A signed original of the written statement required by Section 906 has been provided to NuStar Energy L.P. and will be retained by NuStar Energy L.P. and furnished to the Securities and Exchange Commission or its staff upon request.