Investor Presentaiton

First Battery Project in Full Service Stanton Battery Energy Storage System Wellhead Electric Company, Inc. and W Power, LLC • Fully operational at maximum capacity Battery & Hydrogen Projects On-Track • 68.8 MW/275.2 MWh • One of the largest in Southern California • Increasing grid resiliency and reducing carbon intensity Ribbon cutting ceremony December 6th "The Energy Vault team designed and deployed the optimal energy storage solution for our Stanton site. Only a few days after mechanical completion the system delivered full power to the grid validating the quality of the design and execution. Energy Vault did an excellent job of providing a solution that met both the challenging energy density requirements and the equipment delivery time frames to enable the project to go forward. We are a satisfied customer, and we appreciate Energy Vault's expertise, creative thinking and collaborative partnership in bringing this project to fruition." Hal Dittmer, Chief Executive Officer, Wellhead ENERGY VAULTⓇ ADDISON A ADDISON ADDISON © 2023 ENERGY VAULT HOLDINGS INC. ALL RIGHTS RESERVED Enabling a Renewable World 10

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