Last year when I went to Disney, I had asked one of the cast members there and she said that she really wasnt sure but she thought there had to be over 50,000 people who work for disney. Walt Disney World Employees.
Methane is just used as a fuel for a gas turbine (can also be used to drive an internal combustion engine coupled to a generator). The turbine is coupled to a generator, which generates electricity.
Methane is then purified and used as an energy source to produce heat (thermal energy) or electricity. Fermentation is adding bacteria to biomass and produce ethanol (an alcohol). We can use 10 percent ethanol made from corn and added to gasoline to run our cars.