We'd all like to save as much money as we can on our energy bills and one retired engineer is on a mission to do just that.
Gary Day has managed to claw back more than £2,000 for him and his neighbours.
And it's all because their electricity meters are showing the wrong time - meaning they're being charged too much.
Hannah Thomas meets him.
Gary once checked all the electricity meters in his cul de sac and saved his neighbours lots of money.
Swalec say that if any customer's meter clock is incorrect, they'll recalculate their charges - and make sure that no customer is left out of pocket.