9. It works in Europe under subsidies. They also run digesters on food waste.
The economic problem with generating power from manure is in collecting the manure. The transportation costs kill the profit. That will go away as the price of natural gas goes up. The other thing one needs is an additional carbohydrate source like rendered animal waste. It's not that it's not worth the expense, it's that the benefits of generating power from manure are not factored in. We subsidize lots of different kinds of power generation. Allowing methane to escape into the atmosphere without capture the energy is just waste.
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