Honestly have no idea, so this isn't going to help you at all in my replying haha, but...
I've thought once or twice about it, but the way i see it is....at the moment, especially in my area im seeing more and more companys coming into the picture that specialise in solar energy, and because the market is limited at the moment i would say no, but that's not based on anything - so im sure someone more qualified can tell me that im wrong.
However, the market in the future will no doubt pick up, considerably IMHO...so it is probably worth looking into and getting a knowledge and understanding of it for a few years down the line when the work will become more wide spread?
Note : everything i have just said there could be complete tosh, as i have no experience in the field - thats just the way i see it. Open to opionions aswell.