When thinking about peak versus off-peak, consider this: The power company has to build a power plant capable of providing power at high demand times. During the night, most of that capacity is not used. But you can"t just turn down the power plant that easily. So they use a variety of stragegies. Coal still provides most of the base load electricity in the US. For periods when extra capacity is required (peaks), they can supplement with natural gas - much quicker response than coal (this is sometimes called needle peaking). Or buying extra power from other areas of the country that have excesses. And they are always trying to save fuel cost, so they are constantly arbitraging the prices (looking for the best deal) between coal, gas, oil, hydro, nuclear) to fulfill their supply. This often occurs on an hour to hour basis. Hydro is nice if you have it, you can quickly reduce or increase the water through the turbines. Pump storage, as someone pointed out, takes advantage of using the excess electricity during the night to pump water back into a reservoir so it can be used to generate power during the day. Electric vehicle charging during the night can take advantage of the off peak excess power. Ideally, this extra revenue during the night should mean lower overall costs for electricity - but don"t hold your breath.
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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