QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 32.1

Certification Pursuant to 18 U.S.C. 1350

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2025 (the "Report") of Oglethorpe Power Corporation (the "Registrant"), as filed with the Securities and Exchange Commission on the date hereof, I, Annalisa M. Bloodworth, the President and Chief Executive Officer of the Registrant certify, to the best of my knowledge, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.


						/s/ ANNALISA M. BLOODWORTH
						Annalisa M. Bloodworth President and Chief Executive Officer
						May 14, 2025 Date

QuickLinks

EXHIBIT 32.1

Certification Pursuant to 18 U.S.C. 1350 As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

OGLETHORPE POWER CORP 10-Q