Sargent & Lundy

First 500-kV Transmission Line for Tucson Electric Power

New line enhances reliability and serves growth

Abstract—Projections of population growth in the metropolitan Tucson area require that the electric transmission grid in the region be expanded and upgraded.  A key component of this expansion is a new 500-kV transmission line northwest of Tucson originating at the Pinal Central Substation, a major regional hub with access to numerous generating facilities, and extending approximately 66 km to the Tortolita Substation.

Index Terms—Power System Reliability, Substations, Transmission Lines

Calvin Y. Yanaga, Anthony M. Murphy, Michael W. Clark – Sargent & Lundy

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