1. Cost - the single largest hurdle solar energy faces is that competing energy sources have always been cheaper in terms of dollars per kilowatt-hour (a standard measure). Compared to electricity from coal-fired power plants, solar is more expensive - if you don't consider the environmental costs (which typically are hard to asses a dollar amount to).
But in recent years…
The solar market place is changing. When Warren Buffet starts to invest (as he has done recently) you know that the market is going to start rising. A quick look at the way Spain is using solar will show that there is massive potential for 24 hour power from its use. Exciting times, perhaps we can dump our reliance on fossil fuels in the long term.
