[derriz]

The electricity from small modular reactors is far more expensive than that from large reactors - about twice as expensive by some estimates[1]. They also produce more waste per MWh generated.

The industry has been pushing in the opposite direction with larger reactors like the EPR[2] to reduce costs.

When measured by LCOE, a MWh from a new conventionally sized nuclear plant is 4 to 7 times as expensive as a MWh from solar PV, then SMR are simply out of the question from a cost point of view.

[1] https://publications.csiro.au/publications/publication/PIcsi... [2] https://en.wikipedia.org/wiki/EPR_(nuclear_reactor)

[trashtester]

Solar is great in deserts, where the sun always shines and were the main use of electricity is air conditioning during the hottest parts of the day.

Solar is near-useless in colder areas, where you want to use the power for heating in the winter.

If you include the storage + grid expansion needed to compensate for the intermittent nature of most renewables (especially if you don't want to rely on fossil fuels when the wind is not blowing), the LCOE of many of them will be many times higher than just the production cost.

Meanwhile, Korea claims to be able to construct Nuclear capacity at prices down to $0.03/kwh with their APR1400 reactors:

https://www.kns.org/files/pre_paper/34/15A-435%EC%9D%B4%EA%B...

That's at least an order of magnitude lower than the cost of renewables when constant output is required.

[Gwypaas]

Awesome then that on-shore wind is even cheaper than solar, and exists at night. Then for some more, still less than 1/3 to 1/4 of nuclear you get off-shore wind with higher capacity factors.

[trashtester]

When the wind is not blowing, the cost of wind per kwh is infinite.

[freemint]

> Solar is near-useless in colder areas, where you want to use the power for heating in the winter.

Heating is super awesome with renewables. As you can store heat in an well isolated home. Yes you need capacity for that but heat pumps well a lot with that.

[trashtester]

> Heating is super awesome with renewables. As you can store heat in an well isolated home.

Sounds like you're not speaking from experience. Actually, houses are pretty lousy batteries. Most people have a range of only a few degrees that they find comfortable indoors. They will tend to set the thermostat to about the middle of that range. If they turn off the head, the temperature will go the lower end of that range after a few hours. Very few hours if it's really cold outside, and that's when it matters most.

Admittedly, my house is old and not super-well isolated, but during the coldest days of winter (around -20C), it can easily require 10kw, constantly, to keep it warm enough to prevent my wife from becoming agressive.

If we turn off the power for 2 hours, it's already pretty cold.

Heat pumps would reduce overall energy consumption, but not the need for constant use, and more isloation would reduce both, but it would still likely take several kw constantly on days like that.

[freemint]

If your house gets cold after 2 hours you do have a bad isolation.

[trashtester]

The house is 70 years old. 1 wall was renovated, and got modern insulation, but the other 3 have not received that treatment yet. If it's -20C outside, the temperature drops perhaps 2 degrees per hour, if all power is shut off. That means 20C goes to 16C in 2 hours.