Regardless of your heat source, all heating bills go up in the winter, but if you have electric heat, that increase can be substantial.
On average, electric heating systems lose efficiency when temperatures fall below 30 Fahrenheit. The colder the temperature outside, the harder your system will have to work to keep your home comfortable. So as winter continues and temperatures fall, you will see your energy bills increase to keep up with those cold days.
Space heaters can help, but only temporarily:
Use your thermostat efficiently: