31-1 (A) Certification of interim chief executive officer, pursuant to Rule 13a-14(a). 31-2 (A) Certification of chief financial officer, pursuant to Rule 13a-14(a). 32 (A) Certification of interim chief executive officer and chief financial officer, pursuant to 18 U.S.C. §1350. 101 The following materials from the Annual Report on Form 10-K for FirstEnergy Corp. for the period ended December 31, 2022, formatted in iXBRL (Inline Extensible Business Reporting Language): (i) Consolidated Statements of Income and Consolidated Statements of Comprehensive Income, (ii) Consolidated Balance Sheets, (iii) Consolidated Statements of Common Stockholders' Equity, (iv) Consolidated Statements of Cash Flows, (v) related notes to these financial statements and (vi) document and entity information. 104 Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document) (A) Provided herein in electronic format as an exhibit. (B) Management contract or compensatory plan contract or arrangement filed pursuant to Item 601 of Regulation S-K. Exhibit Number Pursuant to paragraph (b)(4)(iii)(A) of Item 601 of Regulation S-K, FirstEnergy has not filed as an exhibit to this Form 10-K any instrument with respect to long-term debt if the respective total amount of securities authorized thereunder does not exceed 10% of its respective total assets, but hereby agrees to furnish to the SEC on request any such documents. ITEM 16. FORM 10-K SUMMARY None. 136
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