This is a great option because it helps small and poor municipalities to retrieve the initial cost of setup up a Methane based power plant. After some x years

This is a great option because it helps small and poor municipalities to retrieve the initial cost of setup up a Methane based power plant. After some x years of BTC mining, the initial investment is fully paid back. Afterwards, they can choose to continue mining BTC or simply hook up the power plant to the electricity grid. A classic win-win.