To calculate the cranial power generation potential (CPGP), first we use the Stanford Binet Intelligence Scale and define a couple of values associated with the intelligence levels on that scale;

1. As the intelligence of the person approaches 20 (an idiot) the CPGP approaches infinity.
2. As the intelligence level of the person reaches 140 (genius) the CPGP approaches zero.

Now we fabricate small windmills for stupid people to wear on their heads; with the amount of information blowing over the heads of stupid people we could power a small country or a major metropolitan area.