It’s the economics - larger reactors produce relatively expensive power (per megawatt-hour), and that’s while still benefiting from economies of scale from thei

It’s the economics - larger reactors produce relatively expensive power (per megawatt-hour), and that’s while still benefiting from economies of scale from their large size (as all thermal power tends to). SMRs are technically fairly straightforward, but they need to be able to built and operated cheaply enough to produce power cheaper than existing large nuclear plants to be economically viable, given the price of competing power sources in most grids. And that’s not on the horizon at this point. Everything points to them producing more expensive power.