Chris is correct, you can't beat the economies of scale present in utility power - even with heat as a bi-product and paying yourself nothing for your work to process "free" fuel.

But there is something to be said for grid independence.  During lower power demand times, run the roid to heat and centrifuge wvo (doing that) AND run DC power into a grid-tied inverter/battery bank and sell excess back to the grid (working on this).  Instead of running the roid 7 days a week, might only have to run it 4 days and use your built up credit on the off days.

Still don't plan on ever saving any money. but brandishing  my digitus medius in the direction of the power company, priceless.

Cheers, Fred