Upfront costs are expensive. But operational and fuel costs are very low, per MWh.
So take the upfront costs at the beginning and the decommissioning costs at the end, and amortize them over the expected lifespan of the plant, and add that to the per MWh cost. When you do that, the nuclear plants built this century are nowhere near competitive. Vogtle cost $35 billion to add 2 gigawatts of capacity, and obviously any plant isn't going to run at full capacity all the time. As a result, Georgia's ratepayers have been eating the cost with a series of price hikes ($700+ million per year in rate increases) as the new Vogtle reactors went online. Plus the plant owners had to absorb some of the costs, as did Westinghouse in bankruptcy. And that's all with $12 billion in federal taxpayer guarantees.
NuScale just canceled their SMR project in Idaho because their customers in Utah refused to fund the cost overruns there.
Maybe Kairos will do better. But the track record of nuclear hasn't been great.
And all the while, wind and solar are much, much cheaper, so there's less buffer for nuclear to find that sweet spot that actually works economically.
So they're trying to put 2GW of dispatchable (can be dialed up and down on demand), carbon-free electricity by 2028. If you include the last year and a half of the exploratory drilling work they've done on site, that's about 5 and a half years.
They're also saying that each well is about $5 million, have about 30 wells planned for the 400MW project. Not sure how much going up to 2 GW would increase the cost, but that's $0.33 per watt for the 400 MW plan.
In comparison, Vogtle added 2 nuclear reactors for 2 GW of capacity in Georgia, and it cost $35 billion and took 16 years. That's $17.50 per watt.
Solar is somewhere between $1 to $1.20 per watt, but isn't dispatchable.
Ongoing operational costs might be different between all of the different types of generation, but the up front costs are important enough to where they should be a significant part of the discussion.
So if they can pull this off in a few places, this will go a long way towards actually going to zero carbon on the grid.