There used to be an electricity tariff in the UK called Economy7 which was a simplistic version of this. Valid during night hours, you could, eg, recharge stor

There used to be an electricity tariff in the UK called Economy7 which was a simplistic version of this. Valid during night hours, you could, eg, recharge storage heaters with it, for release during the day. Not sure if it is still available. Edit: it is, but requires special meters at the premises.