Solaris Energy Infrastructure Inc

Disclosure Controls and Procedures

In accordance with Exchange Act Rules 13a-15 and 15d-15, we have evaluated, under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of September 30, 2024. Disclosure controls refer to controls and procedures designed to provide reasonable assurance that the information required to be disclosed by us in reports that we file under the Exchange Act is accumulated and communicated by our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure and is recorded, processed, and summarized and reported within the time periods specified in the rules and forms of the SEC. Based on the evaluation of our disclosure controls and procedures as of September 30, 2024, our principal executive officer and principal financial officer have concluded that, as of such date, our disclosure controls and procedures were effective in our internal control over financial reporting.

As disclosed in Note 2. “MER Acquisition” included in the notes to unaudited condensed consolidated financial statements contained herein, we acquired MER on September 11, 2024, and its total revenues constituted approximately 6% of total revenues as shown on our unaudited condensed consolidated statements of operations for the three months ended September 30, 2024. MER’s total assets constituted approximately 42% of total assets as shown on our unaudited condensed consolidated balance sheets as of September 30, 2024. We excluded MER’s disclosure controls and procedures related to its internal control over financial reporting from the scope of management’s assessment of the effectiveness of our disclosure controls and procedures. This exclusion is in accordance with the guidance issued by the Staff of the SEC that an assessment of recent business combinations may be omitted from management’s assessment of

internal control over financial reporting for one year following the acquisition. As part of the Company’s ongoing integration activities, the Company’s financial reporting controls and procedures are in the process of being implemented at MER.

Changes in Internal Control over Financial Reporting

There were no changes in our system of internal control over financial reporting (as defined in Rule 13a-15(f) and Rule 15d-15(f) under the Exchange Act) during the quarter ended September 30, 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.