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Energy Resources Department Power Purchase and Storage Agreement City Council Study Session – 3/5/26 Deb Ferraro, Energy Resources Coordinator Scott Bouchie, Director of Energy and Sustainability Pinal Solar Project • 25 MW Solar Power • 20 MW Battery Energy Storage System (BESS) • 20-year agreement (estimated start date in 2027) • Located where Mesa can easily transmit power to Mesa’s ESA • Mesa is one of ten (10) participants. • Total project is 400 MW Power and BESS Arizona Electric Power Cooperative (AEPCO) •Cost Impact •Reliability •Sustainability Most important criteria for resource choices: Mesa Electric Customers (feedback sourced through a survey) Cost Impact of Pinal Solar (One of the lowest priced resources) $0 $50 $100 $150 $200 $250 $300 Legacy Hydropower Traditional Bilateral (RFP process) Monthly Bilaterial (Reverse Auction) RMS Purchases (aggregated wholesale) Other Solar Projects in ESA AEPCO Pinal Solar Project Current Power Contracts by Price (per MWh) Highest Cost per MWh Lowest Cost Per MWh $29.63 Reliability of Pinal Solar •Long-term power = security •Contributes to diversified portfolio •Consistent pricing •Battery storage • Flexible • Dispatchable • Increase grid reliability Sustainability of Pinal Solar (Pinal Solar increases renewable power from 35% to 57%) 18% 1% 1% 15% 65% Fiscal Year 25-26 18% 2% 2% 14% 21% 43% Fiscal Year 28-29 Percentage Renewable / Traditional Power Mesa Future Load Shape 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec MWh Projected Load & Resources Without Pinal Solar or BESS Projected Resources Projected Load 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec MWh Projected Load & Resources With Pinal Solar and BESS Projected Resources Projected Load Graphs represent 2027, with Pinal Solar starting in June 2027 Traditional Bilateral – Ranging $60+ - $151/MWh Questions or Comments? City Council Study Session – 3/5/26 Mesa Electric Service Area (ESA) and Council District Boundaries