Bizarre Sources of Energy That May End Up Powering Our Future

Did you know that the Central Station in Stockholm uses the heat generated by 250,000 commuters to warm water for an office building 100 yards away? Real estate company Jernhusen owns both the station and the office building. They expect to lower energy costs by 20% per year with this system.
Or that coffee grounds can be used to create biodiesel fuel? A recent study found that there was a reasonably standard composition and little variation in the relevant physical properties of fuels made from different types of coffee, which means all waste coffee grounds are a viable feedstock for producing biodiesel.
Finally, and going back to Sweden again, did you know that smugglers are helping power Sweden's public transport by smuggling alcohol? The customs service seizes almost all of the 185,000 gallons, or 700,000 liters, of smuggled alcohol last year and uses it to power buses, trucks and a biogas train.
15 Bizarre Sources of Energy That May End Up Powering Our Future