How much is the service charge? You might be able to save that if you do an interconnect between the houses. How practical it would be to have the interconnect in the first place would depend greatly on distance.
What's your usual heating fuel? It would probably make sense to build up a CHP system that doubles as a backup generator.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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