The principal business address of each of the Reporting Persons is 250 W 55th Street, 31st Floor, New York, New York 10019.

Each of the Reporting Persons that are entities are organized under the laws of the State of Delaware. David Nanus is a citizen of the United States.

The information required by Item 4(a) is set forth in Rows 9 and 11 of the cover pages hereto for each Reporting Person and is incorporated herein by reference for each Reporting Person. On March 4, 2026 Lightning Power Holdings, LLC ("Lightning") and Thunder Generation, LLC, and CCS Power Holdings, LLC (together the "Other Holders") sold an aggregate 14,300,000 shares (11,219,029 and 3,080,971 shares, by Lightning and the Other Holders respectively), of Common Stock at a public offering price of $164 per share in an underwritten registered secondary offering (the "Secondary Offering"). In addition, on March 4, 2026, the Issuer repurchased 1,829,269 aggregate shares of Common Stock (1,435,148 and 394,120 shares from Lightning and the Other Holders, respectively), in a privately negotiated transaction (the "Share Repurchase"), at a price equal to the $164 per share public offering price in the Secondary Offering. In connection with the Secondary Offering, Lightning and the Other Holders granted the underwriters an option to purchase up to 2,145,000 additional shares of Common Stock, which option has not yet been exercised. LS Power Equity Advisors, LLC is the investment advisor to LS Power Equity Partners III, L.P., which may be deemed to beneficially own the shares held by Lightning. LS Power Equity Advisors, LLC, is the investment advisor to LS Power Equity Partners IV L.P., which may be deemed to beneficially own the shares held by the Other Holders. David Nanus is the President of LS Power Equity Advisors, LLC. As a result, each of LS Power Equity Advisors, LLC and Mr. Nanus may be deemed to share beneficial ownership of the shares held by Lightning and the Other Holders. Mr. Nanus disclaims beneficial ownership of all such shares. The number of securities reported as beneficially owned herein includes 2,589,007 shares owned by Lightning and includes 710,993 shares owned by the Other Sellers, representing an aggregate of 3,300,000 shares, that have been deposited in a voting trust ("Voting Trust") pursuant to the Amended and Restated Voting Trust Agreement (the "Voting Trust Agreement") dated January 30, 2026, among Wilmington Savings Fund Society, FSB (the "Trustee"), Lightning, the Other Sellers, and the Issuer. None of the shares included in the Secondary Offering were held in the Voting Trust.

The information required by Item 4(b) is set forth in Rows 9 and 11 of the cover pages hereto for each Reporting Person and is incorporated herein by reference for each Reporting Person. The percent of class represented by the amount in Row (11) is based on 212,376,200 shares outstanding after the completion of the secondary offering of the Issuer's Common Stock and the Share Repurchase (as defined herein), as reported in the Issuer's Prospectus, dated March 2, 2026, filed with the SEC on March 3, 2026 (without giving effect to the underwriters' option to purchase additional shares of Common Stock).  %

The information required by Item 4(c)(i) is set forth in Row 5 of the cover pages hereto for each Reporting Person and is incorporated herein by reference for each Reporting Person.

The information required by Item 4(c)(ii) is set forth in Row 6 of the cover pages hereto for each Reporting Person and is incorporated herein by reference for each Reporting Person.

The information required by Item 4(c)(iii) is set forth in Row 7 of the cover pages hereto for each Reporting Person and is incorporated herein by reference for each Reporting Person.

The information required by Item 4(c)(iv) is set forth in Row 8 of the cover pages hereto for each Reporting Person and is incorporated herein by reference for each Reporting Person.