According to Bloomberg, Britons waste £900 million ($1.5 billion) a year by leaving lights, televisions and other electrical appliances switched on when they're not needed. This gem came to them via the UK Energy Saving Trust.
Let's see now: 60 million people and 365 days a year. For each of us, that works out at about £15 each per annum or 4p a day, if my arithmetic is correct. This, I believe, is not going to break the bank.