Impact
Power stations have plenty of unused capacity late at night but must keep running as they take days to shut down. Off-peak rates are used as an incentive for customers to use this surplus capacity and to reduce the amount of peak demand. This can produce cheaper power by delaying the need to build new power stations and reduce environmental impact. The random time delay in the Zellweger means that the power stations aren't hit with a huge demand when all the hot water systems turn on at the same time, rather the load is spread over a greater time period.
Read more about this topic: Zellweger Off-peak
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