Exhibit 2.1 Execution Version MEMBERSHIP INTEREST PURCHASE AGREEMENT BY AND AMONG THE SELLERS SET FORTH ON ANNEX I HERETO, PEAK EXPLORATION & PRODUCTION, LLC, EPSILON ENERGY USA, INC., EPSILON ENERGY LTD. AND YORKTOWN ENERGY PARTNERS XI, L.P. (as Sellers' Representative) DATED AS OF AUGUST 11, 2025 | ARTICLE | 1 | DEFINITIONS | AND INTERPRETATION | 1 | | --- | --- | --- | --- | --- | | Section | | 1.1 | Defined Terms | 1 | | Section | | 1.2 | References and Rules of Construction | 1 | | ARTICLE | 2 | PURCHA ...