Electricity is both variable cost and fixed cost. Whenever you use electricity, you will be charged for the use of electricity so it becomes variable cost because the cost of electricity depends on the household usage. Every month, you will most likely to get different electricity cost, for cold weather you will most likely to use the heater so it requires more energy and electricity demands increased so cost will also increase. But in case, you leave your house for a month, you will still need to pay for the electricity fixed cost that whether you use electricity or not, there is a cost for the maintenance so electricity is both variable and fixed cost.
