Why not just capture the methane directly from the rubbish dumps...with a little compression and drying will work fine in a gas engine to generate electricity.
Doing exactly that in my town
"Under the agreement, ESG will purchase Iris Glen landfill methane gas from the city for the next 25 years, providing the community a new and long-term revenue stream. This supplemental revenue will enhance the city's financial, taxation and budget flexibility. Through this project, methane gas emitted at Iris Glen landfill will be processed to serve as an alternative fuel for the natural gas currently used by several local companies. ESG will develop, implement and manage the infrastructure to deliver the methane to the local VA medical facility and the Johnson City Medical Center (a 500+ bed primary care facility)."