Though natural gas prices dropped, the folks doing solar didn't get with the program.
According to the process that may have formed the Solar System planets, the surrounding discs of material around the gas giants gradually coalesced into moons.
I think that will be around 2012, when the net present value of solar electricity will basically be at parity with grid-based fossil fool electricity in many markets without subsidy.
Meaning of solar for the defined word.
Grammatically, this word "solar" is an adjective, more specifically, an uncomparable adjective. It's also a noun, more specifically, a countable noun.