Once upon a time, I wrote a term paper on biogas plants, their economic indicators and their design, it was a long time ago, in the early nineties, it is difficult to imagine electricity cheaper than what is obtained by burning gas from a renewable and cheap gas source. A great option for the work of miners, and if you start a farm with bulls, then you will reduce the cost of coins to zero, close to it. Of course, after the payback of the livestock, the construction of the farm, treatment facilities and a biogas reactor.

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