At least in the UK, demand is consistently lower overnight (e.g. see https://grid.iamkate.com/ https://grid.iamkate.com/) and wind output alone is close to meet

At least in the UK, demand is consistently lower overnight (e.g. see https://grid.iamkate.com/ https://grid.iamkate.com/) and wind output alone is close to meeting overnight demand on windy nights. So storing large amounts of cheap overnight energy can be very useful - especially if it means we can turn off heat pumps at peak times. In fact, in the UK we already have a scheme that pays consumers to not use electricity at peak times: https://www.moneysavingexpert.com/news/2022/10/octopus-ovo-energy-pay-to-cut-electricity-use/ https://www.moneysavingexpert.com/news/2022/10/octopus-ovo-e...