[lightgreen]

The future is nuclear power, and when companies buy hardware they use it at max performance around the clock because energy is cheap and does not depend on weather.

There’s huge lie (by omission) about renewables: nobody explained how to convert the world to 100% renewable energy without coal backup.

[seanmcdirmid]

Coal and nuclear are both inflexible power sources, they are either on or off, and they are hard to turn on and off. Nuclear does have the benefit of being cheap after very high initial capital costs. Natural gas is a much better backup to renewables however, since it can turned on and off at will. Dam hydroelectric also has that nice quality (send water through the generator when you need it, otherwise let it stay in the reservoir).

Given nuclear’s inflexibility, doing untimely work when less electricity is needed for more timely needs is also a win.

[mint2]

I don’t see nuclear making it big any time soon. There’s too much up front costs, but in theory one could make use of any excess heat during off peak hours.

For example desalination, hydrogen production, indoor growing with the light cycle at night or whenever the low demand period is, etc...

For the near future I’d only expect small modular reactors to see much use in areas with unreliable sunlight for chunks of the year. Especially since they could use the waste heat for heating/growing.

[seanmcdirmid]

Nuclear with hydro/pumped storage is an interesting combo: use the extra nuclear power to pump water up into a reservoir and then when extra energy is needed, move the water down through a turbine. The reservoir is basically a battery in this context.

Waste heat isn’t really recyclable, or it wouldn’t be waste heat :).

[labawi]

To generate electricity you need a hot side and a cool side.

The huge towers on power plants are for cooling the warm (waste) output. If you can get someone to cool your warm waste water even further than the cooling towers would, it would both increase efficiency of electricity generation, and use the boatloads of low grade heat for something useful.

You still need independent cooling capability either way.

[manfredo]

Nuclear's inflexibility is not a barrier to countries like France generating over 70% of its electricity from it. Energy demand fluctuations throughout the day are significant but not huge - usually ~20% different from peak to trough.

[lightgreen]

“they are either on or off”

This is not true about neither nuclear nor coal.

Nuclear reaction can be slowed down, coal furnace can be used with lower amount of coal at lower temperature.

Nuclear does not need to be turned on or off spontaneously. Nuclear power plant can increase or decrease power smoothly, and that’s practically enough because consumption patterns are easily predicted.

The inflexibility you are describing is nonissue.

High capital cost is. But the largest issue is irrational fears of voters.

Edit: nuclear or coal are not on or off

[berkes]

They can be slowed down. True.

But that takes minutes or hours to do. And on anything but 100% power, the fuel innefficiency is bad. That latter is mostly a problem with coal, but even nuclear is burning fuel and costing wear.

Plants can be optimized to react really fast, or run efficient on lower capacity, or run efficient on max capacity. Choose one.

[lightgreen]

There’s no need to change power output rapidly. Power demand can predicted very well. Sorry, I didn’t understand your argument.

[Lyrex]

You're right that power consumption is predictable. But looking at some great-parent posts I'd assume we're still talking about using nuclear as backup for renewable sources. In this case, often the renewable power production is the bigger variable factor in my opinion, and it's less predictable than usage patterns.

[phaemon]

> There’s huge lie (by omission) about renewables

I live in Scotland. We now get around 90% of our electricity from renewables. We closed our last coal power station in 2016.

Perhaps you should consider checking your theories against reality before accusing others of lying?

[manfredo]

Don't cut off quotes mid sentence:

> There’s huge lie (by omission) about renewables: nobody explained how to convert the world to 100% renewable energy without coal backup.

Because not everywhere in the world has access to hydroelectric power. The point remains: there is no plan to power the world with renewables without a fossil fuel backup. At least not any feasible plan - batteries don't scale, and the Sabatier processes has well below 50% round trip efficiency.

[phaemon]

> Don't cut off quotes mid

You managed to get the gist.

You don't need a plan to power the world. Try a plan to power your own state and let the rest of the world sort itself out. When you're at 80% renewables and then get stuck, then I'll believe it's an issue. Not when you're at 20% and handwaving theoretical excuses.

[lightgreen]

Not every country has so small population and access to hydropower. Sure some small counties can go 100% renewables but it doesn’t scale.

[phaemon]

Yes it does. Countries with bigger populations can do more, not less. That should be obvious.

[imtringued]

Coal backup is incompatible with renewables. The coal plants clog the grid and prevent the usage of renewables. If you had said gas then those same gas plants could be used to convert hydrogen back into electricity.

[lightgreen]

It is the opposite: coal plants are turned on only when renewables do not produce.

And I didn’t get about hydrogen. Who can produce hydrogen?