Running Large Motors During Peak

Maximum Demand

A second compressor was being rotated in for the second shift and was started to maintain high production during a critical production period for this manufacturer. This met conditions to exceed the maximum demand.

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Situation

A second compressor was being rotated in for the second shift and was turned on to maintain high production during a critical production period for this manufacturer. The compressor warmed up at 17:00, the end of the peak Time of Use (TOU) period (see red area). This met the conditions to exceed the maximum demand - summer peak charge.

Lesson

The Production Manager should have started the compressor after 18:00 where the energy use and maximum demand would be subjected to partial peak rates, and a lower TOU and maximum demand charge. The cost difference for starting the compressor during peak period was about $4,500. Be aware of the time of day when large motors have turned on.

maximum demand

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