PNW · 8-K · 20260807PR000044

Weather Impact on Demand

PINNACLE WEST CAPITAL CORP · 2026-08-07 · Importance 32 · Surprise 24

Weather effects reduced 2026 gross-margin results by a total of $45 million pretax. The quarterly variance chart shows a $17 million impact in the first quarter and a $28 million impact in the second quarter versus normal weather. The company recalculated all periods using the current 10-year rolling average from 2015 through 2024. The $45 million impact exceeds the stated materiality threshold for the filing.

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