This biogas digestor is too high above the ground and has lost the advantage of feeding the wastes from animal shed (in the near front) through gravity. Look at the height of the feeding chamber; it would require lots of energy to feed in the wastes.

Visiting a 25kWp solar power plant in Bulembu Swaziland. Complete grid tied system, clean energy and saves money.

They have an interesting charcoal production technology at this site.