wondering if nuclear fusion will be able to be economical once its invented as the price of grid batteries and solar drops dramatically

@cinebox It seems like they're never going to install generation capacity fast enough to bring retail prices down, at least in the US and at least before other countries demonstrate the economic benefits of cheaper energy. At which point consumption will rise dramatically as we start to use electricity for things it was previously too expensive for, like recycling or desalinating water and making ammonia. ...

@cinebox Once that happens, we'll more rapidly reach a point where the land area taken by solar and wind starts to become a problem. I suspect fusion will see widespread use for space propulsion long before then, though. In the next decade, in fact; Positron Dynamics' antimatter-catalyzed fusion engine should be flying within a couple years.

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