The energy provider will offer its customers gas and electricity in bundle packages, in a format similar to how people top up their mobile phones. "We're saying to people buy it by the day, not by kilowatts or a fancy tariff you don't understand.” - Keith Anderson, Chief Executive, Scottish power. Consumers will use a dedicated app to purchase energy and consumption will be charged on personalised forecast, based on previous usage. Gas and electricity will be sold in packages ranging from one day to a month, and available up to 180 days in advance. The new tariffs will initially be available to existing customers, and if successful, to the wider market.