A pellet of uranium fuel weighing about seven grams – the weight of two nickels – contains as much energy as three barrels of oil. A single 25 kg CANDU fuel bundle, about the size of a fire log, can supply 100 homes with electricity for a year. The same electricity from a fossil station would require 400 tonnes of coal, or 270,000 litres of oil, or 300 million litres of natural gas.