Hi. As with any technology industry, your personal job satisfaction will depend. Alternative energy is a growing industry so there will be lots of great opportunities going forward, if that's what you're looking for. Beyond that I suggest you research specific companies you want to work for to understand their workplace culture, employee benefits, etc. Good luck!
I'm not sure if there is a rate, but a close member of my family has been working in the solar space, first as an engineer and then in different other roles, and he is very satisfied about this field. I'd recommend that you find some Solar Engineers on LinkedIn and reach out to ask for their experiences, which may help you form your own point of view.