We like your designs #2 & #3, and would like to see some variations on this theme from you. Please try shifting the emphasis form the primary colour being red to black. Please also try to make the symbol "stronger".
we're keen to see a symbol which represents something closer to clockwise rotational movement, though not just a wind turbines blades. We have amended the sliders on the brief and would be happy to see ideas that are brighter and bolder. SC