Somebody somewhere would still have to store the energy being produced overnight, which happens to be when nobody wants to use it.
Yes, and:
* Risk of catastrophic failure
* Long term waste which there is no technology capable of handling
* Decommissioning
New Hampshire's utility isn't considering whether to use bitcoin miners or whether to decommission the whole plant and stop using any nuclear energy. They're considering whether they can increase production to cover a higher amount than baseload by making sure they can burn off extra energy easily when demand drops.
IMO too many people are dying from conventional dirty energy sources. We don't know how to handle the waste.
If you could ramp the baseline production up a little bit and meet more of the peak demand from nuclear, it'd be cleaner than relying on the other plants, but you end up with too much energy produced, especially at night when it's cooler. Conveniently, cool temps are a benefit to bitcoin mining rigs, so it works out to spin up some ASICs overnight and make some money from the excess energy.
Nobody's suggesting the utility hold the bitcoin. The expectation would be that it would be sold whenever it's generated, so there isn't really any financial risk. But even if there weren't money to be made from it, having something that can easily be ramped up or down to compensate for energy demand is still useful.
No. It is not. More expensive than anything else we can imagine