I did a quick check on powered automatic revolving doors. The one in the example brochure is probably bigger than the Dutch one but it requires 230V @ 10Amps or 2300 Watts. So, 920 watts to turn a smaller revolving door doesn't seem too outrageous.
Also, it appears that they have hooked a power gauge to the door so patrons can measure the amount of power they generate. So, their power estimates do have some basis.
Edit: They could have their units mixed up or just measuring the peak output which is not the same as average output.
. Each time you pass through the door you generate enough power to make a cup of coffee.
Ben said on December 4th, 2008 at 4:46 pm
I call bullshit on this - there is no way one person generates the energy to heat a cup of coffee.
Energy needed = mass * temp raise * specific heat capacity = ~0.25kg * ~70C * 4.187 kJ/kgK = ~73kj
If it takes you a generous 10s to walk though the door you would need to be producing 73kj/10secs = 7.3kWatts!!!
According to http://www.ncbi.nlm.nih.gov/pubmed/10090637 the maximum a normal person can produce is ~500W so they are way off.