In July 2012, rowers from Nottingham University in the UK, set a Guinness World Record for the most electrical energy generated by indoor rowers in 24 hours. A relay of rowers took to ergs for no less than three minutes, no more than 30 at a time – and created 12.4kWh of energy; enough to power a typical three-bedroom house for an entire day.
A fleet of Concept 2 rowing machines were specially converted to generate power and a display was built by a group of university engineers to keep track of the power generated. So the rowers could see their work converted to power, engineering professor Seamus Garvey helped connect the ergs to a bank of 50w car headlamps.
For more information, read the entire Nottingham Post article.