I don’t sprecken zie deutsch like the guy who took this video of a slide incorporated into the design of a large building in Europe, but the idea is certainly interesting (and fun, and energy efficient). 

According to Slate, a continuously running escalator similar to that found in a shopping centre or convention hall that’s powered by a 20 horsepower motor and is 20 feet high consumes around 31,000 kWh annually.  The average American home, Slate added for comparison purposes, consumes 11,040 kWh a year.