It's also becoming increasingly obvious that solar, wind and probably also geothermal and tidal generation is going to be a bigger and bigger part of the mix, along with decentralized generation.
No, it's not obvious. We've been dumping money into "bootstrapping" the wind and solar energy industries for a very long time now through subsidies and other laws that make them profitable by fiat. Whenever there is a threat to end, or even reduce, the subsidies my mailbox fills with fliers to call my congresscritters. If wind and solar cannot stand on their own then they cannot grow beyond what the government spends on propping them up.
People all over the world are getting tired of increasing energy prices, reduced availability/reliability, and no real CO2 reductions to show for it. Germany found out that for every 4MW of installed wind capacity that there must be 3MW of natural gas as backup. That puts a hard limit on how much wind can contribute to the grid at less than 25%. Solar has similar problems. Storage technologies won't help because if there is a big battery to supply the peak demands then a utility will use whatever is cheapest, not necessarily "greenest", to charge that up. That means coal, natural gas, or nuclear.
For wind and solar to compete with coal and nuclear they must be not only as cheap, or only cheaper by a small margin, but must be a fraction of the cost. I say that because of what people in the industry already know, and Germany has made clear to anyone that has a mild interest in this, is that wind and solar are far too unreliable to provide any significant portion of our electricity needs. The utilities can tolerate 30% capacity factors from wind and solar because the government pays them to use it, and it buys them some good PR. To make that work beyond this limit of 15%, 20%, or perhaps 30%, that engineers and economists estimate the costs have to be so ridiculously low that they can over build their production capacity, build and maintain energy storage, pay for a "smart grid", and buy expensive natural gas turbine peak generation capacity, with enough left over to make a profit.
Amazon and Google are examples of this buying expensive wind and solar to get some good PR. This is advertising for them. It's "greenwashing" their image. Their electricity supply still relies on coal, nuclear, and natural gas, as much as any one else. Unless we see some leap in technology, which is unlikely, then wind and solar will remain a small fraction of our energy supply.