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777 Main Street <br />Fort Worth, Texas 76102 <br />United States <br />T +1.817.735.6000 <br />F +1.817.735.6148 <br />www.jacobs.com <br />Jacobs Engineering Group Inc. <br />01 <br />October 17, 2024 <br />Attention: Frank Escobedo <br />Director, Strategic Origination & Development <br />Calpine Corporation <br />Project Name: JEC Santa Ana - Collector Substation <br />Project Number: WFXQ4100 <br />Subject: Code Compliance Review <br />Dear Frank: <br />Jacobs Engineering Group, Inc., as an independent third-party engineer, completed a site <br />observation of the Johanna Energy Center high voltage collector substation located at 1312 E. <br />Warner Avenue, Santa Ana, California 92705 on May 11th, 2023. A subsequent observation was <br />performed on October 8, 2024, to observe and record site lighting levels. <br />Our observations were limited to the Phase III expansion of the collector yard and high voltage <br />equipment and did not include the SCE Thaddeus Substation. <br />Our observations confirm that construction has been completed in accordance with the sealed <br />drawings that were transmitted on December 22nd, 2022. No substantial field modifications were <br />identified, and the need to provide portable lighting during night-time maintenance activities as <br />required by the National Electric Safety Code was discussed with the facility staff. Therefore, it is the <br />opinion of Jacobs that the Collector Yard and High Voltage Equipment were built in full conformity <br />with the certified designs and in accordance with the relevant codes, regulations and standards. <br />Yours sincerely <br />Jacobs <br />John Kerenyi, P.E.Kamran Haghighi, P.E. <br />Registered Electrical Engineer Registered Structural Engineer