i agree that retric's reasoning about capital utilization efficiency applies to both nuclear and solar generation; in fact, it might be even more applicable to solar generation, because although the variable costs (cost of sales, you might say—proportional to power usage) for nuclear energy are low, they're virtually zero for pv. what
i was saying about dispatchability is that nuclear plants typically
can't be turned off; they keep generating power even when grid prices go negative, so the nuclear plant operator is literally paying someone with a giant resistor bank to burn up the energy the reactors are generating. (nowadays, hopefully they're paying someone with a battery bank to charge their batteries instead, but the future is not yet widely distributed.) your earlier comment about the ap1000 having significant dispatchability is welcome news, and
https://en.wikipedia.org/wiki/AP1000 says there are six of them already in operation
there are particularly perverse grid incentives in some places which result in pv farms continuing to operate when grid prices go negative, too, but that's just a fake market; nothing about the generation technology requires that. if you close a contactor to short out your solar panel, it stops dumping any energy into the grid in nanoseconds, literally faster than the contact bounce in your contactor, without any damage or risk to the panel, power electronics, or the rest of the plant
with respect to transmission and battery storage, while there is some reason to locate pv farms some distance from the energy consumers—the consumers may be tightly packed and/or in a cloudy area—there is no reason to locate battery storage far away from energy consumers. you want batteries to be as spread-out as possible, as close to the load as possible, for many reasons: to avoid time-of-day congestion of transmission capacity (and even distribution! point-of-use batteries reduce or eliminate the need to overprovision distribution capacity); to prevent fires from spreading from one battery to another; to eliminate power outages caused by problems in transmission and distribution; to eliminate transmission and distribution energy losses for stored energy; and to reduce the opportunities for rent-seeking by transmission and distribution operators. the land use, climate, and safety considerations that sometimes limit the distribution of pv spreading-out don't apply to spreading battery storage out
as for the o&m costs: while the iea does wonderful work, and i appreciate you pointing to this very informative open-access report, this report is from december 02020, and it's largely built on data from previous years, much of it from plants built years earlier. the main topic of the tomas pueyo article we're commenting on here is how lower prices for solar panels are forcing people to design new solar power generation in ways that 'waste' solar panels in order to commensurately reduce the other associated costs, such as the operation & maintenance costs you refer to in table 3.14
with that in mind, looking at https://www.solarserver.de/photovoltaik-preis-pv-modul-preis..., pvxchange's current mainstream panel price index is €0,12 per peak watt, and in september 02017 (probably about the average time the plants profiled in the iea report were being built, and as far back as the data currently on that page goes, though archive.org has older versions) it was €0,42 per peak watt. that is to say, solar pv modules cost 250% more at the time. those solar farms were designed for a very different world than the one we live in today, one that could tolerate much higher o&m costs in order to make better use of the comparatively scarcer solar panels