Control, operate, or maintain machinery to generate electric power. Includes auxiliary equipment operators.

Control and monitor biomass plant activities and perform maintenance as needed.

Monitor and control activities associated with hydropower generation. Operate plant equipment, such as turbines, pumps, valves, gates, fans, electric control boards, and battery banks. Monitor equipment operation and performance and make necessary adjustments to ensure optimal performance. Perform equipment maintenance and repair as necessary.

Operate or maintain stationary engines, boilers, or other mechanical equipment to provide utilities for buildings or industrial processes. Operate equipment such as steam engines, generators, motors, turbines, and steam boilers.

Operate or control an entire process or system of machines, often through the use of control boards, to transfer or treat water or wastewater.

Control or operate entire chemical processes or system of machines.

Distribute or process gas for utility companies and others by controlling compressors to maintain specified pressures on main pipelines.

Operate or control petroleum refining or processing units. May specialize in controlling manifold and pumping systems, gauging or testing oil in storage tanks, or regulating the flow of oil into pipelines.

All plant and system operators not listed separately.

Calculate, measure, load, mix, and process refined feedstock with additives in fermentation or reaction process vessels and monitor production process. Perform, and keep records of, plant maintenance, repairs, and safety inspections.