“I double-checked the math myself, and got an answer I don’t trust, but it may be correct if all 830 million wind turbines run at full power non-stop.”
Please check my math!
I verified that his number (25 billion mwhs) would be for a year. That is 25x10^9 mwhs.
One turbine at ‘max’ for a year:
3 x 24 x 365 = 13,000 mwhs.
At 20% efficiency = 2,600 mwhs.
For 830x10^6 turbines:
2.6x10^3 x 830x10^6 = 2,158 x 10^9 = 21 x 10^11 mwhs.
One turbine running at 100% for the full year would produce 3 x 24 x 7 MWH per year: 26280 MWH.
Divide that into 25 billion MWH: 951000 wind turbines running full-time full power.
Divide that 951000 by whatever efficiency you want to get the number of turbines necessary to produce the 25 billion MWH at that efficiency.