A wind turbine with a swept area of 1000 m2 operates with 56% efficiency under STP conditions. At the location of the windmill, there is no wind between 1800 and 0600. At 0600, the wind starts up and its velocity increases linearly with time from zero to a value that causes the 24 hr average velocity to be 20 m/s. At 1900 the wind stops abruptly. What is the maximum energy the windmill can generate in one year?