Start with heating and cooling, as these can use a lot of electricity: set the air conditioner sensibly, close doors and curtains, and use fans where suitable. Switch off lights and appliances at the wall when they are not needed, and replace older globes with LEDs. Check your retailer’s rates and whether a time-of-use tariff or off-peak period suits your household, especially for hot water and laundry. Your bill, retailer or state energy advice service can help identify the biggest sources of usage.