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.
As an aside: For the same amount of energy, coal produces more greenhouse gases (CO2) than gasoline. So, if your electricity is generated form coal (which is common), a fuel cell powered or electric car will probably produce more greenhouse gases than a gasoline powered car (of the same size, power, etc).