Exhibit 32.1

Certification of Principal Executive Officer

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, I, Nicholas Stork, Chief Executive Officer of Archaea Energy Inc. (the “Company”), hereby certify, that, to my knowledge:

1. Amendment No. 2 to the Annual Report on Form 10-K for the year ended December 31, 2020 (the “Report”) of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: December 28, 2021

/s/ Nicholas Stork

Nicholas Stork

Chief Executive Officer

(Principal Executive Officer)