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I slashed yearly power usage from 30MWh to 11 MWh by converting from direct electrical to geothermal heating. Nowadays, 1/3 of bill is household electricity (ovens, TV's computers, lights) and 2/3's is heating/hot water. It did force me to install water heating system (I chose floor heating as it is more effective with heat pump). Expected break-even is roughly 7 years. Lower power draw also made it possible to go down from 25A to 16A main fuse contract, which is substantially cheaper per year (like 300$ or so).
This is cold climate though.
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Thank you for your time,
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