Pinnacle West(PNW) - 2024 Q2 - Quarterly Results

Exhibit 99.1 FOR IMMEDIATE RELEASE August 1, 2024 Media Contact: Analyst Contact: Alan Bunnell (602) 250-3376 Amanda Ho (602) 250-3334 Website: pinnaclewest.com PINNACLE WEST REPORTS IMPROVED SECOND-QUARTER FINANCIAL RESULTS • New customer rates, record heat positively impact quarter-over-quarter earnings • Customer and sales growth continue to reflect a strong Arizona economy • Expanded bill assistance, heat relief and energy efficiency programs provide greater support to customers PHOENIX – Pinnacle West ...