A typical residential customer during the month of January consumes 20 GJ per month. Extraordinary cold spells coupled with more time spent at home could typically contribute to higher usage (above the average of 20 GJ/month).
You may also have been billed for more days than last month. You can check your bill to see how many days you were billed for and compare it to the number of days you were billed for on your previous invoice.
For example, if your December invoice shows you were billed for 20 days and your January bill shows you were being billed for 40 days, this could be one of the reasons your bill is higher this month.Save on Energy