Molten salt reactors might be the future of carbon-free green energy and they already cost less to run than coal power plants. 

First constructed and operated in the 1960s, molten salt reactors are an interesting and promising energy technology. There's a variety of different designs for these reactors, in essence, they all primarily utilize molten fluoride salts kept under low pressure as the coolant for the reactor.

While molten salt reactors were initially developed around 60 years ago, they fell out of the limelight due to their corrosivity, with investment in other types of energy seeming more lucrative at the time. Today, interest in molten salt reactors is being revived as an alternative to standard nuclear and carbon-based energy sources.

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