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zeeke42 t1_j7piq49 wrote

You want the previous year, because past 3 months doesn't tell you every season.

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invenio78 t1_j7pnt6x wrote

I presumed this was for heating so the last three months would be fine as most people don't heat their homes during the summer. General electric usage is personal so he can look at his own utility bill, see how many kwh he uses a month and the just use local rates to calculate the expected cost.

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