Let me add that the coal to produce the power those 7,500, 15 MW wind turbines could make over 30 years would cost $1 trillion,164 billion ,375 million dollars. The wind through those turbines still comes freeThe manufacturer's estimated lifespan for the 15 MW Vesta turbines is up to 30 years. The weight of coal burned by that 500 MW plant during that time span would equal the mass of 7,500, 15 MW turbines which would produce 112.5 GW for 30 years with no additional fuel. Additionally, at today's rates ($115/MT), the coal to power that plant for 30 years would cost $5 billion 175 million dollars. The wind through those turbines comes free.