Solar and wind power have the cost trend of a technology. Not quite Moore's law, in that the percentage drop per unit time is less, but the important point is

Solar and wind power have the cost trend of a technology. Not quite Moore's law, in that the percentage drop per unit time is less, but the important point is that it is an exponential decline. Fossil fuels have the cost trend of a commodity; it goes up, it goes down, it goes up, depending on demand. Whereas technologies have a cost that drops as demand goes up, commodities have a cost that rises as demand goes up. This means that commodities can remain cheaper than the technology for a long time, and then suddenly lose that advantage, and when they do they will probably never get it back.