Comment by Two4

I don't think Buffett himself chose these investments, so it's just namebaiting to mention him in the headline. Since these plants run at a loss (coal power in the US is notoriously lossy), I'd say they're either part of a larger energy portfolio or they're a strategic investment in anticipation of dropping in a modular nuclear reactor. There's quite a compelling business case for converting older coal-fired stations this way, as most of the infrastructure (steam turbines, transformer yards, HV transmission lines) is already in place.