Not knowing your entire background or your goal it would be hard to say exactly what you would need. The key is if you have T&D planning; and would like to remain in T&D planning just in the Wind industry; I don’t think there is a great deal you need to improve upon except understanding the problems associated with wind power transmission; but I am not a hiring manger and in today’s market they can be selective with regards to qualifications.
If you are looking to work with the mechanics of Wind energy, I think the Mechatronics courses will benefit you the most. If you don’t have an EE and want to work on the new interface and transmission development work and engineer technical problems associated with transmission; the I suggest you complete the technical degree and if do have the degree; complete to the next level and look at some of the Mechatronics course. The rest will require you to demonstrate your accomplished skills and problem solving ability