UNS Energy is the parent company of Tucson Electric Power and UniSource Energy Services.
UniSource Energy was started in 1998 as the parent company for Tucson Electric Power.
In 2003, the company acquired Citizens Communications's Arizona gas and electric operations in 2003 and renamed them UniSource Energy Services.
[3] In 2013, Fortis announced its acquisition of UNS and completed this in August 2014.
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