The annual electricity bill for the project will be an estimated $11,000. That's a lot of electricity -- but just imagine how much higher that bill would be if those 25,000 bulbs were incandescents.
This dimmer switch smiles when the lights are off and frowns when they're on.
Brazil is pioneering a new sort of jailhouse workout, in which inmates ride bikes instead of pumping iron. The bikes, unlike weightlifting or prison-yard basketball, help power a nearby town.