Reading your conclusion that solar is more subsidized than NG I feel it's partly because of market distortions in the USA. (This bias may, or may not be, related to the pre-existence of gas plants i.e. the absence of capital cost).
Once one looks outside the USA solar appears to be a clear leader in at least certain areas. Take Dubai, where solar beats out both coal and gas plants by a substantial margin:
http://www.apricum-group.com/d...
Another illuminating post is from the Economist:
http://www.economist.com/news/...
In any case, some thoughts below.
> What is your definition of "highly subsidized"?
The ordinary definition is something like "a benefit made by the government or a public body to assist an industry or business so that the price of a commodity or service may remain low or competitive."
In the case of natural gas, it's a combination of:
1. ultra-low interest rates; and
2. so-called "dumb money" (including, perhaps especially, public pension funds) debt-financing of shale companies.
(I'm aware that one could argue that these are not strictly subsidies, but that doesn't deflate the point that NG is surviving on cheap credit and not competitive advantage).
Once these factors dissipate, natural gas might be substantially more expensive â" and quite a bit more expensive than solar.
Of course one could argue that solar similarly benefits from low interest rates. The key difference is that NG is a resource industry (usage decreases supply, thereby increasing cost), and solar is a manufacturing industry (benefitting from economy of scale, etc, where costs go down as more is manufactured).