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Comment on Mini Powerplant: two small blocks that can power an average American home

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"....saving about $100,000 since installing its five boxes 9 months ago"

Might be a naive question, but can anyone please explain to me the economics behind this?

I was a bit distracted while the interview was playing, but what I gathered is that their efficiency in converting chemical energy (specifically, so far, natural gas and oxygen) to electricity -- perhaps, per a comment I saw elsewhere, when the resulting heat can also be used and so considered part of the equation -- is about twice that of utility generated and delivered electric power.

I don't know whether my understanding is correct, but that's how I currently understand the comments regarding greater efficiency and cost savings.

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