EXHIBIT 99.1 SAGUARO ACQUISITION CORP. 4201 NORTH 24TH STREET, SUITE 100 PHOENIX, ARIZONA 85016 December 30, 2004 VIA FACSIMILE AND FEDERAL EXPRESS UniSource Energy Corporation UniSource Energy Tower One South Church Avenue Tucson, Arizona 85701...Agreement and Plan of Merger • December 30th, 2004 • Tucson Electric Power Co • Electric services • Delaware
