It’s expensive and nontrivial to do, though. In a far enough future we might have more of it (I did a deep dive on this for sci fi purposes). There are multiple countries in the world; there are no global energy monopolies. Any sufficiently capitalized company can work on this and undercut others. China in particular is a very pragmatic jurisdiction when it comes to energy and their answer is usually “all of the above, at scale, and cheaply”. So if a company invents something cheap like that, China would be a massive customer. So would many others.