New Belgium distilling used to take the dregs from their beer batches and ferment them again anaerobically to produce methane they then used to fire some of their boilers.

Then those dregs got composted and used on the landscaping.

There are ways to co-generate fuel for this but I don't want to lose the larger message that PP is producing toy solutions no matter how you zhuzh them up.

Could they get over that in version 5? Probably. But more likely on 6 or 7, and more likely still for another entrepreneur to scoop them and make something real.