The Large Hadron Collider experiment was put on hold for a few months after scientists at CERN were forced to switch off the device.
Top UK scientist Professor Hugh Jarse was on hand to explain.
"It is quite straight forward actually. We are not sure how this happened but somehow, someone forgot to put any money on the electric meter."
Centrica who manage the electricity account for the site said "There was a burst of electricity usage when they switched on the device. It was equivalent to suddenly switching on 8 million kettles at once. It's no wonder the £5 that was on the meter quickly ran out"
Steps are now being taken to ensure that a minimum of a £100,000 is on the meter at all times.