Why reducing peak demand is a good idea?
Saving electricity during the peak demand period is beneficial to the community and the electricity system.
Supplying electricity for an ever increasing peak demand requires building more electricity infrastructure such as generators and higher capacity powerlines. Ultimately customers pay to build this infrastructure through increases in the price of power even though much of it goes unused for the remainder of the year.
On very hot weekdays the community can help reduce peak demand by limiting use of major appliances between 4pm and 8pm.