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Yup, as said previously, I know that. I was only wondering if it was effective, that is if many people actually modified their habits to use electricity during the night. Especially when some companies don't make having two different rates for electricity price the default, and charge a little per month for it.
Besides, isn't the situation reversed in winter, when people turn on home electric heating at night ? (Whereas large offices tend to prefer fossil fuels for heating)