Renewable energy

I would like to discuss , understand the views , pros and cons of the renewable energy business , Is there any upside available in this space or has this already fizzled out. We are aware that most of the stocks rallied to all time highs in no time at all , so what's the future for this space over the next 3 years to 5 years. Suzlon and SJVN are in my radar , both look attractive valuation wise and fundamentally as well.