Well, energy from waste, here in the States we should be able to run a long time. hehehe..
Years ago, I would drive by land fills (only hills we have in Florida outside of the on-ramp for the interstate) and see the big flames as they burned off the methane gas. What a waste..
The proble with biogas from tips is it needs cleaning before it can be used to supply homes. Often the cost of cleaning it outweights resale price for the gas.