The last two remaining units at the James River Power Station in Southeast Springfield are about to go offline.
City Utilities is expected to approve a plan this week to retire them.
Spokesman Joel Alexander says the plant near Lake Springfield has been operating since the 1950s.
Alexander says CU retired has already retired the first three units at the power station.
Once the work is done, a combustion turbine will be the only part of the plant still operating.
CU plans to repurpose part of the building.
It comes at a time when the utility is using more renewable forms of energy like wind, solar, and methane gas.
At one time, 80-percent of the power City Utilities used came from coal.
Now, 40-percent of the power comes from renewable energy.
CU will still have two units at the Southwest Power Station once the old power plant is retired.