Power plants that are used during the transition between base load and peak load demand. These plants are not as difficult to ramp up as base load plants or as expensive to operate as peak load plants.

Wind and solar energy power plants are often used to meet intermediate load. Because wind and solar resources are intermittent by nature and the electricity they generate fluctuates with the weather and the time of day, they cannot generally be used to meet peak demand or to provide energy on a consistent basis for base load purposes (unless supplemented with battery storage energy).