Are you talking about fusion or something? The whole point is that nothing now known competes with fossil fuels. Oil is ridiculously cheap and versatile energy.
Now if you want to replace oil, we can substitute coal and water. So, just because we are quickly running out of one fossil fuel does not mean we are running out of all fuel's or even just all fossil fuels.
Coal is basically in the same situation as oil, contrary to what you may have heard. The good stuff is gone and it's getting more and more expensive already, when measured by joules of net energy per dollar. It's lower quality and harder to mine stuff.
Fossil fuels are really mindbogglingly cheap, but you still see completion such as: Ethanol fuel in Brazil, nuclear power France, and by looking at the subsidies it takes to adopt wind power you can see how close it is to coal.
You can't look at state supported industries and come to any meaningful conclusions. All those examples have government driving them. Nuclear fission power would not even exist without government: the plants and businesses are uninsurable in the free market. No private insurance company to date has concluded the lifetime risks of a nuclear power plant are acceptably quantifiable.