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Tucson Electric Power completes transmission system upgrades

Tucson Electric Power Co. completed several upgrades to its transmission system to improve service reliability and help meet future energy needs.

The Fortis Inc. subsidiary completed a $14 million project to build the 138-kV Orange Grove substation. The substation houses a transformer that will reduce the voltage of electric current from the transmission system and also connect the existing 138-kV transmission lines.

The utility also completed a $10 million upgrade of Vail Substation that includes new breakers, electrical switches, protective devices and communications equipment, a $2.4 million upgrade of the Rancho Vistoso substation, a $1 million upgrade of an existing 138-kV transmission line that connects its Irvington substation to the 22nd Street substation, and a $2.8 million upgrade of the 138-kV transmission line that connects the North Loop substation to the Rancho Vistoso substation.

Elsewhere, Tucson Electric is upgrading new overhead and underground lines as part of an approximately $1 million project in the Midvale Park neighborhood.

The company plans to invest about $260 million in 2018 to upgrade its electric transmission and distribution facilities and other resources.

Tucson Electric Power serves approximately 424,000 electric customers in southern Arizona.