I prefer #47 as it appears less busy. The windmill helps integrate the idea of wind but I have two reservations: One is that big windmills are moving into our community and the project has been very divisive. Normally friendly neighbours have become embroiled in fighting "industrial wind". The 3-blade icon of the windmill has in our community unfortunately become a symbol of corporate control and almost symbolic for the fight of local control of renewable resources. Not entirely positive, so I am generally trying to avoid it. Two is that MWSI's focus is on small or residential-scale solutions and the windmill image is typically associated with large/industrial systems. Complicated, I know!
Closing thoughts: there is a particular tone/feeling that is important to work in, at least a little bit. The founders of MWSI are all Objibwa natives and the art from their culture has a distinctive look to it. Here are some samples: