In many areas in the US, the average windspeed is around 10 mph. The power in one square foot area of such wind is nearly exactly 5 Watts. 23 The theoretical maximum efficiency occurs when the wind is slowed down to 2/3 its initial speed, which would give around an absolute maximum of 59.3% efficiency. Dec 17, 2020 · In the real world, we only experience time as moving forward, in part due to entropy. Entropy is a property of matter that defines how much energy is not available to make things (like a chemical ...