Cooking

Use a microwave rather than a conventional oven to cut costs by 70 percent.
Try not to open the oven door when cooking.
Boil water in an electric kettle instead of on the hotplate.
When cooking in a saucepan, use minimal water and keep the lid on to trap heat.
Fan-forced ovens cost up to 35 percent less to run than conventional ovens.
Cook larger batches of food and freeze for another day.