Some utilities may also charge a base rate for a certain level of consumption and higher rates for increasing blocks of consumption.Some utilities can charge commercial and industrial customers more per kilowatt-hour (kWh) during peak periods than for consumption off-peak.It generally costs more for utilities to generate power during certain periods of high demand or consumption, called peaks. Some utilities may charge different rates for electricity consumption during different times of the day.There can be different rate schedules within each class. The price an electric utility charges its customers depends on the customer "classes," which are typically residential, commercial, and industrial.The value of the energy saved by turning a CFL off depends on several factors: This in turn determines the shortest cost-effective period for turning off a fluorescent light. Therefore, the real issue is the value of the electricity saved by turning the light off relative to the cost of changing a lightbulb. Turning off fluorescent lights for more than 5 seconds will save more energy than will be consumed in turning them back on again. The amount of electricity consumed to supply the inrush current is equal to a few seconds or less of normal light operation. ![]() In any case, the relatively higher "inrush" current required lasts for half a cycle, or 1/120th of a second. The amount of energy varies between manufacturers and models-however, ENERGY STARĀ© rated bulbs are required to endure rapid cycling for five-minute intervals to ensure that they can hold up to frequent switching. It is a popularly held belief that CFLs use a lot of energy to get started and it is better not to turn them off for short periods. You can generally extend the life of a CFL bulb more by switching it on and off less frequently than if you simply use it less. The operating life of CFLs is more affected by the number of times they are switched on and off.
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