Investor Presentaiton

18 Pilot Project Exploring Hydrogen as Potential Solution for Long Duration Storage Profile of Project Possible Scenario for Palo Verde Nuclear Plant Collaborators • Palo Verde nuclear plant and Idaho National Laboratory Pilot Program . Examine long-term cost effectiveness of hydrogen production at utility scale Goal • Use of hydrogen for long term storage of energy 100% Plant Output Power to hydrogen - stored Power from storage to grid Power to grid Power to grid Mid-day Lower demand on grid Late afternoon/evening Peak demand PINNACLE WEST CAPITAL CORPORATION

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