The International Energy Agency just released its annual report, and the highlight is that solar energy is now the “cheapest electricity in history.”
The IEA charges €120 for their report, so I don't know if there are any caveats on this statement. I would think it would be latitude-dependent, at least.
The Atlantic writes:
At the same time, it substantially downgraded its forecast for coal, saying that the fuel source will soon enter a prolonged and irreversible decline. That means global carbon pollution could peak in the next several years—though, without further policy, it will not decline as rapidly as needed to avoid catastrophic global warming.