National Grid will be able to tell people the cheapest time to turn on a washing machine up to two days in advance.
New software, developed with conservation charity WWF, breaks the day down into two-hour segments, warning users when energy is at peak demand and informing them when demand is low.
It combines historical data from the grid with weather information from the Met Office to predict times of high and low demand.
The National Grid said it expected energy companies to use the information to produce their own apps encouraging customers to use energy when demand was at its lowest and turn appliances off when there was pressure on the system.
Because it is the balance of supply and demand which matters. And we can’t forecast wind and solar 48 hours ahead…..