is that they have other waste besides paper and wood. Like clothes, shoes, rotten food, metal, plastic, etc. You would have to hire a team to sort the landfill and remove the stuff that should not be used as fuel.
Research into hydrogen fuel cells might be interesting if they can make giant fuel cells. Just get a source of H2O and use electricity to seperate the hydrogen from the oxygen and use the hydrogen as fuel for the cells to generate power. I do not think this technology has been perfected yet.