Exhibit 32.a

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Dominion Energy South Carolina, Inc. (the “Company”), certify that:

the Quarterly Report on Form 10-Q for the quarter ended June 30, 2025 (the “Report”), of the Company to which this certification is an exhibit fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)).

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of June 30, 2025, and for the period then ended.

     /s/ Edward H. Baine

    

      
Edward H. Baine
Chief Executive Officer
August 1, 2025

     /s/ Steven D. Ridge

    

      
Steven D. Ridge
Executive Vice President and
Chief Financial Officer
August 1, 2025

DOMINION ENERGY SOUTH CAROLINA, INC. 10-Q