Price of electricity in Finland peaks at 2.35€/kWh today. Keeping my tiny granny cottage warm costs me over 50 euros for a single day. It's negative 25C (-13F) outside.
That massive spike of 50c/kWh at the left looks tiny compared to today even though that's already insanely expensive
You need to seriously need to rethink your home. First off, consider getting a radiator heater. These heaters have no fan and are filled with oil to passively heat the air. They are pretty efficient and can heat a small space.
Next make sure you have blinds covering all windows. Windows loss a lot of heat even if they are double paned.
In the spring time it may be worth getting some insulation blown in.