The energy generated by football dynamo Wayne Rooney as he sprints around the pitch during a match is enough to boil water for 16 cups of tea, according to research published on Tuesday.
David James of Sheffield Hallam University's Centre for Sports Exercise Sciences calculated that the 21-year-old Manchester United and England striker produced 6,700 kilojoules of energy, equivalent to 1.86 kilowatt/hours of electricity.
This, he said, was also enough to light an average house for 90 minutes -- the length of an average match -- or run a standard television for six and a half hours.
The research for energy utility E.ON UK is part of a programme to try to raise awareness in schools of energy usage in the face of the global warming crisis caused by burning fossil fuels for power and transport.