Investor Presentaiton

Bringing the Residential Customer into the Advanced Economy 20 • • Initiatives Award-winning program to promote installation of advanced smart thermostats reduces demand during peak load window Super off-peak electric vehicle charging rate equivalent to ~30¢ per gallon gasoline Potential Impact Demand Savings During Peak Afternoon Window 300-500 MW VOLT 100-150 MW Today Future PINNACLE WEST CAPITAL CORPORATION

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