If it costs more, most people aren't going to buy it, or even be able to buy it.
If you can't make the net cost less, it will fail.
Even if initial cost is more, if it can be financed, and it reduces costs over a decade by a majority of what it costs to repay the loan, that would be good.
But huge upfront cost, only to then mean paying MORE for electric, will go over like a lead balloon.
Give me a motorhome-sized nuclear reactor a block or neighborhood can all pitch in on and buy for 25K ($1000 each across 25 homes, or $500 each across 50), that will then provide electric power for everyone at NO additional cost for two decades. The technology exists.