> 20 * 365 = 730 kWh > > 1,226,400,000 / 730 = 1,680,000 homes - almost all of London's usage! And I've made an error - surprise, surprise... 20 * 365 = 7300 kWh 1,226,400,000 / 7300 = 168,000 homes - phew, thought the icecaps had melted already. Dave ;)