Our house has the highest electricity use on Christmas Eve - lots of cooking, baking, cleaning, plus the christmas lights are already on. This is usually the only day in the year when we use more than 10kWh (typically 12-13kWh).
As far a total power usage (including gas for heating) then that would be the coldest day of winter. Our condensing boiler can use as much as 15-20m3 in a day, which is about 175-225kWh.
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Ecorenovation - the bottomless piggy bank that tries to tame the energy hog.
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