Exhibit 99.1

(1)  The shares of Class B Common Stock, par value $0.0001 per share ("Class B
     Common Stock") of Spartan Acquisition Corp. III (the "Issuer") are
     automatically convertible into shares of the Issuer's Class A Common Stock,
     par value $0.0001 per share ("Class A Common Stock") at the time of the
     Issuer's initial business combination on a one-for-one basis, subject to
     adjustment pursuant to certain anti-dilution rights, and have no expiration
     date. The shares of Class B Common Stock reported as beneficially owned
     represent the aggregate number of shares that are held of record by Spartan
     Acquisition Sponsor III LLC ("Spartan III Sponsor").

     AP Spartan Energy Holdings III, L.P. ("AP Spartan") is the sole member of
     Spartan III Sponsor. Apollo ANRP Advisors III, L.P. ("ANRP Advisors") is
     the general partner of AP Spartan. Apollo ANRP Capital Management III, LLC
     ("ANRP Capital Management") is the general partner of ANRP Advisors. APH
     Holdings, L.P. ("APH Holdings") is the sole member of ANRP Capital
     Management. Apollo Principal Holdings III GP, Ltd. ("Principal Holdings III
     GP") is the general partner of APH Holdings. Leon Black, Joshua Harris and
     Marc Rowan are the directors of Principal Holdings III GP, and as such may
     be deemed to have voting and dispositive control of the shares of Class A
     Common Stock held of record by Spartan III Sponsor.

     Each of the reporting persons, and Messrs. Black, Harris and Rowan,
     disclaims beneficial ownership of any securities reported herein as held by
     Spartan III Sponsor, or that may be beneficially owned by any of the other
     reporting persons, in each case except to the extent of any pecuniary
     interest therein, and this report shall not be deemed an admission that any
     such entity or person is the beneficial owner of or has any pecuniary
     interest in, such securities for purposes of Section 16 of the Securities
     Exchange Act of 1934, as amended, or for any other purpose.

     The address of each of ANRP Advisors and Principal Holdings III GP is c/o
     Walkers Corporate Limited; Cayman Corporate Centre; 27 Hospital Road;
     George Town; Grand Cayman KY1-9008. The address of each of ANRP Capital
     Management and APH Holdings is One Manhattanville Road, Suite 201,
     Purchase, New York, 10577. The address of each of Spartan III Sponsor, AP
     Spartan and Messrs. Black, Harris and Rowan is 9 West 57th Street, 43rd
     Floor, New York, New York 10019.