Indianapolis Airport is one of the largest airports in the United States, and it has an energy usage of about 1.5 million megawatt hours per year. This is about the same as what a small city would use in a year.
The airport has two biomass plants that burn switchgrass and wood chips to create electricity. They also have solar panels, wind turbines, and a hydroelectric plant. The airport is always looking for new ways to reduce its energy usage and save money.