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Kate Humble challenges six families to cut the amount of energy they use by 30 per cent in just three weeks. Energy monitors have been installed in every home, and Dr Alan Owen, sustainability director from Robert Gordon University, monitors and records all their energy use. As inspiration, they visit the town of Lockerbie to find out about some of the most energy-efficient homes in the country. Energy-saving expert Lucy Conway is on hand to highlight wasteful energy habits and help with tips and advice on how to save. The One Show's engineering expert Marty Jopson demonstrates renewable energy by showing them how to harness energy from the sun and the wind.

Find out if the families manage to meet the 30 per cent target within the three week deadline and if they change their energy wasting ways.