Interesting. Gas is much much cheaper in AU.
Electricity is an interesting one though - in that there's potentially scope for "off-peak pricing". You might check with your supplier to see if they have that.
Also.. .while on the topic of heat, since you are building a new house, have you checked the sun angle/direction charts for your area? Designing to catch the existing heat in winter should help. In the US, I guess that means main windows should be on the south - and you'd want a slight overhang to block summertime sun.
You probably know all that of course.
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