In a recent study, researchers from the European Environmental Bureau (EEB), the Stockholm School of Economics (SSE), and the Potsdam Institute for Climate Impact Research (PIK) questioned the planned development of new nuclear capacities in the energy strategies of the United States and certain European countries.
Check out the farm bill, or ethanol in gasoline, or various other things. They also can disincentivize things, outright ban things, and add untold cost to competing stuff in order to make yours more profitable than theirs.
The research done here had to be within the existing regulatory environment, which is not a fixed constraint at all but rather a product of government and industry actors.
And all of that is just talking about more indirect controls commonly applied in neoliberal leaning countries, some countries directly control how much things cost and how much overhead there is.