An environmental engineering firm is designing an offshore wind farm to assist in powering a coastal region. The proposal consists of 40 identical wind turbines, each having blades of length 45 m. The local average wind speed at the hub height is 12 m s-1, and the density of air is 1.2 kg m-3. If the wind farm operates with an overall efficiency of 35% in converting the kinetic energy of the incoming wind into electrical power, what is the estimated total electrical power output of the wind farm?
2.3×106 W2.3 \times 10^6\text{ W}2.3×106 W
9.2×107 W9.2 \times 10^7\text{ W}9.2×107 W
1.8×108 W1.8 \times 10^8\text{ W}1.8×108 W
7.7×106 W7.7 \times 10^6\text{ W}7.7×106 W