Tucson Electric Power (TEP) Company’s Irvington Road Generating Station in Tucson, Arizona, was state-of-the-art when it was completed in 1967. The four-unit, 422-megawatt plant used natural gas as its principal boiler fuel, and heavy oil when gas was not available. However, the skyrocketing cost of oil and gas in the 1970s made the plant uneconomical to use, except as a means of meeting peak summertime load demands.


That prompted TEP to begin evaluating ways to keep the Irvington Road Facility from experiencing an untimely retirement. The solution was a first-of-its-kind conversion project designed to allow utilization of coal as a principal fuel while retaining the capability to accept natural gas or oil as separate fuels.


The project’s complexity centered around logistics, sequencing and timing of design, procurement and construction. Over the years, the space between the units at the plant had been filled with other facilities and buildings – relocation and removal of these facilities was a must before new construction could occur. Sundt worked hand-in-hand with TEP’s engineers to develop a master schedule that included the sequencing of all of the facilities to be demolished, relocated or newly constructed, and then built sub-schedules for each facility in greater detail to help bid and manage work. Our focus, experience and dedication made this important project constructible at the lowest cost.


Tucson Electric Power Company


Irvington Road Coal Conversion Plant