To add to my own comment, you can see that the US is no longer a capitalistic system today in a second, clearer way: Trump.

Trump is actively harming the US economy by blocking free trade and blocking renewable-energy projects. That forces the US to pay more for energy, by buying fossil fuels. It is clear why trump is doing that: he is getting money ("lobbied") from the fossil fuels industry, so they face less competition and can continue to sell their energy products for a higher price. If renewable energy could enter the market, all oil companies would face declining revenues in the next 10 years.

The fact that the US pays more for energy is clearly harming the US economy, because it makes manufacturing (which needs a lot of energy) more expensive. But that is a price that Trump is willing to pay.

It is to be noted that in a capitalist system, i.e. a free market, renewable energy would be built in the US today at a rapid pace, as it is the cheapest form of electricity in human history.