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SouthLine transmission project brings power grid upgrades to southern Arizona

Summary by KGUN 9
A major transmission project is upgrading power infrastructure across southern Arizona to meet growing energy demands and improve grid reliability for the region.The SouthLine Transmission Project, operated by Grid United, is enhancing electrical infrastructure across a 280-mile connection between Tucson Electric Power and El Paso Electric in New Mexico. The project includes upgrading 60 miles of existing transmission lines from Vail to Willcox …

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KGUN 9 broke the news in on Tuesday, December 9, 2025.
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