This is a great graphic that shows how distorted the electricity market is. There are many who rule out renewable energy saying it has to make its way in the free market. But our current electricity market is not a free market, it is a rigged market. Many of the costs of electricity are not reflected in its price. For example, the added health expense of treating asthma from coal plant emissions is reflected in our insurance bills not our electricity bills. Therefore that cost is external to the price we see on our electric bill. As a result we get no price signal in our electric bill. Wind and solar do not contribute to Asthma and yet that economy is not reflected in the price we pay for wind and solar. In a perfect market the price signal from adverse health effects of coal power would be included in the price of electricity generated by coal.
The graphic below shows what studies have revealed in terms of the magnitude of costs that are not reflected in what we pay for various electric power sources. It is important to point out that this graphic was done prior to the massive expansion in in horizontal, hydraulic fracturing (Fracking) in gas and oil exploration and prior to Fukushima, both of which I would expect would increase the externalized costs of the related electricity generation.