Lack of transport infrastructure. When byproduct methane is conveniently located (like in the middle of a city) it often is piped through gas lines to be sold,

Lack of transport infrastructure. When byproduct methane is conveniently located (like in the middle of a city) it often is piped through gas lines to be sold, or a power plant is built on site and connected to the grid. Many landfills already have power plants built on them, https://www.energy.ca.gov/data-reports/california-power-generation-and-power-sources/biomass/landfill-gas-power-plants https://www.energy.ca.gov/data-reports/california-power-gene... The problem is when it is very remotely located, and the amount of gas is far too low to economically justify building out gas pipes or electric transmission lines.