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Pinnacle West is a holding company whose principal subsidiary is Arizona Public Service, a vertically integrated electric utility serving approximately 1.4 million customers across a 35,000-square-mile territory in central Arizona, including the Phoenix area. APS owns or leases 6.5 gigawatts of power generation capacity, including a 29% ownership stake in one of the largest nuclear plants in the US, Palo Verde. Half of the electricity that APS supplies to customers comes from clean energy sources, including nuclear.

Iberdrola SA, operating under the ticker IBE, is a multinational electric utility company primarily engaged in the production, distribution, and trading of electricity. The company operates across various sectors including renewable energy, networks, and liberalized markets, focusing on sustainable energy projects. Founded in 1992 and headquartered in Bilbao, Spain, Iberdrola has grown to be a leader in renewable energy, advocating for cleaner energy solutions worldwide.