Solar power is now 16% cheaper than coal plants.
In January 2015, the price per w/h for solar was as low as 5.85 cents per watt. joking aside in the past 18 months the cost of installed solar power has nearly halved!
We know that there's still a lot of room for improvement of solar cells, just a few weeks ago there cost of watt installed was 4.00 cents per watt. It needs, according to certain economists, to drop to US$0.005 (that's half a penny BTW) if not even lower. In the past 18 months the cost has halved -- far ahead of expectation.
The key now is panel with greater energy transfer, the next step is to improve the panels (as opposed to lower production costs).
Still this is amazing. Rooftop solar panel will be the next big thing, especially in markets where electricity prices are high -- subsides are no longer needed.