Using your microwave instead of the oven for certain foods can save you money as they only heat the food and not the air around it

For example, a 240g jacket potato,was calculated that cooking it in a 900-watt microwave uses 18% of the energy that it takes to cook it in a standard oven at 200°C. It would cost you 7p in the microwave, 37p in the oven!!  ref: sust-it.net