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Danville Utilities is requesting that its electric customers conserve power today from 2 p.m. to 6 p.m. and on Tuesday and Wednesday from 2 p.m. to 6 p.m. because of a peak alert issued by its wholesale power supplier.
A peak alert means that conditions will exist that may cause demand for electricity across the regional power grid that serves Danville to be at its highest point of the year. Plenty of power will be available, but there is a higher cost in generating and transmitting larger loads of power.
Danville buys power on the open market and is part of the PJM grid, or the Pennsylvania, New Jersey, Maryland Electric Regional Transmission Operator. Temperatures in communities across this region are expected to range from the upper 80s to low 90s today, Tuesday and Wednesday.
In Danville, a high of 91 is forecast today and 92 on both Monday and Tuesday.
PJM bases its generation capacity charges on the five highest peak usage hours on the regional grid from June through September. Peak usage in the summer likely will occur on hot and humid weekday afternoons when air conditioners are working extra hard to cool homes and workplaces.
Power suppliers have to be ready to produce enough power to supply the peak. That means using equipment that otherwise would not be needed and would sit idle. The cost of using this equipment is passed along.
In addition to generation capacity charges, Danville and other utilities incur added transmission costs during periods of peak demand. Danville’s transmission provider is American Electric Power, which bases its transmission charges on the highest peak usage hour in a year.
American Municipal Power, the wholesale power supplier for Danville and more than 130 other members in five states, monitors the power grid and issues peak alerts as needed.
Customers can take simple conservation steps during peak periods: