Sanjeewa Look into electrical, erctelonic, and mechanical engineering. I would say the best thing that anyone could tell you is to stay versatile. Things are changing so fast in the green industry that by the time you learn one thing very well, it has become obsolete, or close to it.If you are a self help type of person and are really interested in installing or consulting, check out a program RETScreen'. This is a program that the Canadian government has put out to help consultants and estimaters plan for renewable energy conversions