Item 7.01 Regulation FD Disclosure On December 10, 2024, Solaris Energy Infrastructure, Inc. (the “ Company”), announced the pricing of an underwritten public offering of 6,500,000 shares of its Class A Common Stock, par value $0.01 per share (“ Class A Common Stock”), at a price to the public of $24.75 per share, pursuant to a registration statement on FormS-3(FileNo. 333-283308)(the “ Registration Statement”) filed previously with the U. S. Securities and Exchange Commission (the “ Commission”). A copy of the news release announcing the Offering (as defined below) is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Item 8.01 Other Events.

Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit Description Number 1.1+ Underwriting Agreement, dated as of December 10, 2024, by and among Solaris Energy Infrastructure, Inc., Yorktown Energy Partners X, L. P. and Santander US Capital Markets LLC as representative of the several underwriters named in Schedule B thereto. ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── 5.1 Opinion of Vinson & Elkins L. L. P. 23.1 Consent of Vinson & Elkins L. L. P. (included as part of Exhibit 5.1 hereto). 99.1 Press Release, dated December 10, 2024. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). Certain schedules and similar attachments have been omitted pursuant to Item 601(a)(5) of Regulation S-K. The registrant undertakes to furnish supplemental copies of any of the omitted schedules upon request by the SEC. SIGNATURES 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. SOLARIS ENERGY INFRASTRUCTURE, INC. By: /s/ Kyle S. Ramachandran Name: Kyle S. Ramachandran Title: President and Chief Financial Officer Dated: December 11, 2024