From the FAQ:

> The plan is for the small amount of spent fuel [..] that comes out of our reactors at the end of their duty cycle to only be temporarily stored on-site until a federal repository or interim storage solution becomes available.

>The NRC is legally required to ensure that, in the event of bankruptcy that the site is secure and the spent fuel remains safely managed before ultimately transferring over to the U.S. Department of Energy's (DOE) possession

So basically like with all other nuclear, the tricky parts with unknown costs are handed over to future taxpayers. These costs are thereby removed from the estimates in Kaleidos business plan making it seem like it's a viable business, which is isn't otherwise.

Meanwhile the founders get rich today, since immense amounts of money has to be presented upfront, before any energy is produced at all.

The obvious replacement for diesel generators today is solar+batteries, which is evident in many countries that used to rely on small scale diesel generators already.