The three charts below look at solar power in the past, now, and in the future.
See full article at CleanTechnica
Solar was more expensive than other forms of energy and only survived with subsidy.
Solar now costs the same as other forms of electricity.
Solar will get inexorably cheaper than alternatives.
The chart below shows the levelized cost of electricity from solar.
As the cost of solar falls, so the amount installed will rise --- exponentially. Interesting that the forecasts in the Wikipedia article by the US Department of Energy of a LEC of PV solar of 13 c per Kw by 2019 look very conservative. The LEC by the end of 2015 for solar PV should be on my forecasts about 15 cents, only a little above the average US electricity price of 12.3 cents.
Disclaimer. After nearly 40 years managing money for some of the largest life offices and investment managers in the world, I think I have something to offer. But I can't by law give you advice, and I do make mistakes. Remember: the unexpected sometimes happens. Oddly enough, the expected does too, but all too often it takes longer than you thought it would, or on the other hand happens more quickly than you expected. The Goddess of Markets punishes (eventually) greed, folly, laziness and arrogance. No matter how many years you've served Her. Take care. Be humble. And don't blame me.
BTW, clicking on most charts will produce the original-sized, i.e., bigger version.