Sorry, I'm jaided. I entered the sector at the height of the market in 2008 and have seen successes and failures on the venture capital side. There is no question that renewables, particularly distributed solar, are changing the energy landscape across the globe. I guess my point is that in what is still an emerging market, there are winners and losers, and there will be more consolidation. Do your research and choose wisely. For example, Bloom Energy's fuel cells work in a market where power prices are >20 cents/kWh. US prices have been at 7 cents or below for the better part of 5 years and are unlikely to rise much higher than that. So the company needs effective policy design.
I fully intend to stay in energy investing post MBA and have no doubts energy will always be an exciting, essential, and (hopefully) profitable career path. Godspeed