For Oakland……47,286 megawatt hours
For Topeka…….66,405 megawatt hours
That gives an idea about how little intercepted vertical area can potentially produce so much power, even though practically many factors reduce that potential.
But the fact that wind velocity is typically two to three times as great at 30,000 feet, in some cases even at 15,000 feet, as it is at 100 feet above ground means a factor of eight to twenty-seven as great for these high altitude winds, reduced only by the lesser air density factors at those altitudes.
When the higher “capacity factor” figures, discussed in the next section, are taken into account as well, captured energy factors per square meter of intercepted wind get further multiplied by a factor of two to three as compared to average ground level winds.