The Navajo Mine is the sole supplier of coal to the adjacent Four Corners Power Plant (FCPP).

In 2016, NTEC contracted North American Coal Corporation as the operator for Navajo Mine, forming Bisti Fuels Company, LLC.

Expanding further, NTEC acquired Cloud Peak Energy assets that included three coal mines in Wyoming and Montana.

A 7-mile (11 km)-long standard gauge line was built in 1974 from the power plant to the Hosteen stockpile.

Because there was no connection to the national railroad network, three diesel locomotives and 22 Maxon bottom dump coal hopper cars were transported from Gallup on low-bed trucks.

The Tocito Dome Field is proven and producing with existing offtake contracts in place.

[5] The line runs from the Navajo Mine north-northwest to the Four Corners Generating Station, which is located 25 miles (40 km) west of Farmington, New Mexico.

The Century 425 is normally operated only as a control cab to for the radio remote-controlled E60, when the empty train is returning to the mine.

The prime mover in the diesel-electric is still present to provide emergency power in event of an electric outage.

[6] In 2020, Arizona Public Service (APS) announced plans to close the Four Corners Generating Station.