The Answer, My Friend, Is Blowin' Harder In the Wind

WIND SPEED mph     ENERGY GENERATED BY WIND TURBINE

           20                                              X                                    

           25                                             2X

          31.7                                           3X

          40                                              4X

          50                                              5X

Energy generated is proportional to the cube of wind speed.  Make the tower a little taller, make the blades a little longer, get it in a little windier environment and the returns will be massive.

Three Cubed Equals Twenty Seven