The lights at home, your TV and computer, the kitchen cooker... loads of things we use are powered by electricity or gas.
But there's a warning from energy watchdog, Ofgem, that your parents' bills will soon be costing more.
It's down to a fall in Britain's ability to produce energy, as many ageing power stations close.
That means having to buy more energy from abroad, but global competition means it costs more.
Renewable energy sources, such as wind, are still growing and aren't able to plug the gap just yet.
Energy experts say we should make our homes more energy efficient and only use the power we need.