New Debt / Obligation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549     FORM  8-K   CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934   Date of Report (Date of earliest event reported): October 17, 2025     EVERSOURCE ENERGY (Exact name of registrant as specified in its charter)   Massachusetts   001-05324   04-2147929 (State or other jurisdiction of incorporation)   (Commission File Number)   (I.R.S. Employer Identification No.)   300 Cadwell Drive, Springfield , Massachusetts 01104 (Address of principal executive offices) (Zip Code)   ( 800 ) 286-5000 Registrant’s telephone number, including area code   Not Applicable (Former name or former address, if changed since last report.)   Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):   ¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)   ¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)   ¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))   ¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))   Securities registered pursuant to Section 12(b) of the Act:   Title of each class Trading Symbol(s) Name of each exchange on which registered Common Shares, $5.00 par value per share ES New York Stock Exchange   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).   Emerging growth company ¨   If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨               Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.   On October 17, 2025, Eversource Energy issued $600,000,000 aggregate principal amount of its 4.45% Senior Notes, Series HH, Due 2030 (the “2030 Notes”), pursuant to an Underwriting Agreement, dated October 15, 2025, among Eversource Energy and BofA Securities, Inc., J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, PNC Capital Markets LLC, RBC Capital Markets, LLC, and U.S. Bancorp Investments, Inc., as representatives of the underwriters named therein (the “Underwriting Agreement”).   The Notes are Eversource Energy’s unsecured obligations and were issued under the Twenty-Third Supplemental Indenture, dated October 1, 2025, between Eversource Energy and The Bank of New York Mellon Trust Company, N.A. (the “Twenty-Third Supplemental Indenture”), supplementing the Indenture between Eversource Energy and The Bank of New York Mellon Trust Company, N.A. (as successor trustee), dated as of April 1, 2002 (the “Indenture”).   Interest on the 2030 Notes is payable semi-annually in arrears on June 15 and December 15 of each year, beginning on June 15, 2026 and ending on the maturity date of the 2030 Notes.   The foregoing summaries of the Underwriting Agreement, the Indenture and the Twenty-Third Supplemental Indenture do not purport to be complete and are qualified in their entirety by references to such documents. The Underwriting Agreement and the Twenty-Third Supplemental Indenture are filed hereto as Exhibits 1.1 and 4.1, respectively. The Indenture is filed as Exhibit A-3 to Eversource Energy’s 35-CERT, filed April 16, 2002 (File No. 070-09535).   A copy of the opinion of Ropes & Gray LLP relating to the validity of the Notes is filed as Exhibit 5.1 hereto.   Item 9.01 Financial Statements and Exhibits.     (d) Exhibits.   Exhibit Number   Description 1.1   Underwriting Agreement, dated October 15, 2025, among Eversource Energy and the Underwriters named therein. 4.1   Twenty-Third Supplemental Indenture, dated as of October 1, 2025, between Eversource Energy and The Bank of New York Mellon Trust Company, N.A., as Trustee. 4.2   Form of the 2030 Notes (included as Exhibit A to the Twenty-Third Supplemental Indenture filed herewith as Exhibit 4.1). 5.1   Legal opinion of Ropes & Gray LLP relating to the validity of the Notes. 23.1   Consent of Ropes & Gray LLP (included in Exhibit 5.1). 104   Cover Page Interactive Data File (embedded within the Inline XBRL document).         SIGNATURE   Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.     EVERSOURCE ENERGY   (Registrant)       October 17, 2025 By: /s/ Matthew P. Fallon     Matthew P. Fallon     Assistant Treasurer