Combustion turbines, which use a combusted fuel-air mixture to spin a turbine, are also relatively fast to start up. Most hydroelectric turbines, which use flowing water to spin a turbine, can go from cold start to full operations in less than 10 minutes. A generator’s startup time is different from a generator’s ramp rate, which reflects how quickly that generator can modify its power output once it’s operating. Generator startup time differs across electricity-generating technologies because of the differences in the complexity of electricity generating processes, especially when starting again after all processes have been stopped (cold shut down). The time it takes a power plant to reach full operations can affect the reliability and operations of the electric grid. Some power plants, especially those powered by coal and nuclear fuel, require more than half a day to reach full operations. power plants can start up-going from being shut down to fully operating-within one hour, based on data collected in EIA’s annual survey of electric generators. ![]() Energy Information Administration, Annual Electric Generator InventoryĪbout 25% of U.S.
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