You can't get an "informed opinion" by reading crap like that report.

The Spanish systems have systematic design failures for stability and electricity market design. Working out the political failures that led to the design failures is much harder.

Consultancies like https://www.nera.com/capabilities/power--utilities--and-rene... specialize in advising about electricity networks and market design.

Only those working closely in that profession have any knowledge of the underlying causes.

Most everyone else (including this comment) is different levels of ignorance and cluelessness.

Edit E.g. Crap quote from the report "but no significant oscillations with amplitudes above 20 mHz". The rest of it is about that level from what I could tell.

Yes, that is plausible indeed, but the problem is that there are many explanations which are plausible, but there doesn't seem to be a smoking gun.

Strange about that explanation for example is that the time correlation is backwards. First the solar generation started to drop out and only then central generator stations tripped. Also the on-going frequency oscillations had already stabilized. If it was related to frequency issues, the solar inverters would either have shut down 15 minutes earlier (while the frequency oscillations were at the peak) OR 1-2 minutes later (when power stations tripped and frequency would have dipped)

> If you combine this with renewable generation, it all falls apart

Rubbish. Only true if the renewable generation is poorly integrated. Solar plus batteries can provide synthetic inertia if the incentives/regulations are correctly designed.

Australia has been adding oodles of solar, and they have been doing it surprisingly well.

Nuclear can load follow, within limitations: https://news.ycombinator.com/item?id=36254716

Ok, nuclear is a strategic missile target. It's harder to take out renewables and batteries because they are more distributed.

> The problem spain needs to overcome is the morning and evening peaks. From memory it's something like 1-2 gigawatts (but it could be more.)

The EU has collectively added 27 Gwh of battery capacity in 2025 alone. If Spain only needs anything close to 2 GW of load for around 2 hours in the morning and evening each, this seems to be inherently achievable.

> you totally can, and for keeping the grid stable, they are absolutely grand.

Nuclear plants can load follow at about 5% of their rated capacity per minute. This is glacial in the world of electricity.

At the moment, this would theoretically work, because you have gas peaker plants that can adjust much faster and pick up the slack while nuclear plants come up (or down) to speed.

But countries like Spain and Denmark want to have a 100% renewable grid within two decades (much shorter than the typical lifetime of a nuclear reactor). So gas peaker plants are increasingly not an option.

The reality of the grid at that point will be a lot of wind and PV capacity (because it is dirt cheap). Nuclear is not compatible with those on its own, because a cloud passing over a large PV installation will drop power much quicker than nuclear will be able to follow.

Of course you can build a ton of batteries to act as a buffer. And guess what, that's exactly what we are doing right now. But at that point, why do we need nuclear again? Simply building batteries is already much cheaper than building a substantial nuclear generation capacity and while batteries will continue to become cheaper while nuclear won't.

Also, if you require new nuclear plants to load follow on a regular basis, it completely destroys the already bad economics of the technology. You need to run those at capacity continuously to make even remotely sense.

The manufacturing of all modern battery chemistries is dominated by Chinese companies because the Chinese government has strategically invested in production capacity and expertise for more than two decades.

But Chinese companies are running and building production facilities around the world. Leaving the production in Chinese hands is a political choice, not an inevitability.

Also, you can't take batteries away once you have delivered them to the customer. I have a 14kwh battery in my basement. It's built by BYD, a Chinese company. But once installed, I can pull the network cable and air gap it from the internet. Communication with my roof-mounted-solar and grid-tied electrical supply works without external network access, if I deem that an unacceptable risk. I could also do the work required to filter all network request from the battery management system at the router to make sure it can only contact servers from a whitelist, if I want to have access to diagnostics while I'm not at home.

These are all known, manageable risks that are completely within the capability of sovereign states to take care of. But there is literally no government (apparently) that can keep Trump and Netanyahu from fucking over the global fossil energy supply on a whim.

Indeed, at least 2 Chinese companies (CATL and BYD) already have in mass production sodium-ion batteries, including a 50 MWh model for stationary storage.

Using lithium-ion batteries for stationary storage is a historical accident, because using lithium makes sense only in mobile applications where weight is essential.

For new installations, sustainable alternatives, like sodium-ion batteries, should be preferred.

In the past there have been many companies in various countries, including Australia, UK and USA, which have claimed that they are able to make very high capacity flow batteries for stationary storage, based on various chemistries, e.g. vanadium-vanadium or bromine-sulfur. A few such batteries have been installed at various customers.

I do not know what went wrong with flow batteries. They have bad weight, similar to the lead-acid batteries, but that is irrelevant for stationary batteries. Otherwise they should be the best batteries for stationary applications, because they have 3 essential advantages over other batteries. Their energy and their power are not coupled as in normal batteries, but they can be scaled independently, i.e. for a given power (which is determined by electrode area) in a flow battery the stored energy can be made arbitrarily large, because it is determined by the volume of a couple of tanks where liquid electrolytes are stored. The second advantage is that the auto-discharge when the battery is not used can be almost null, because the 2 electrolytes can be stored in separate tanks, preventing any reaction between them. The third advantage is that the solid electrodes do not take part in the chemical reaction, so they are not damaged by a charge/discharge cycle, so they can have a very long life.

Despite the advantages, none of the many kinds of flow batteries that have been proposed has been a commercial success and it appears that the companies producing them have lied about the problems that might plague them.

I have not seen any published information about which were their problems, but I assume that a likely cause was the separator membrane that stays between the 2 liquid electrolytes, which must selectively allow the passage of certain ions and not of others. Such membranes are expensive and they might have a short lifetime, requiring frequent maintenance. Another possible problem could be caused by secondary reactions leading to solid precipitates from the liquid electrolytes, another possible cause for expensive maintenance.

Regarding the battery firmware, it does not really matter if the batteries are made in China. The history of the last 3 decades has demonstrated that no firmware can be trusted, regardless whether it comes from a company located in USA, in UK, in China or in any other country, so any firmware must be treated with suspicion.

China actually makes a great number of electronic products that are much more trustworthy than almost anything that comes from USA or other western countries, because those products, like it was the norm several decades ago, but no longer today, are accompanied by full hardware documentation, including schematics and PCB layout, which makes it much easier to verify that a malicious firmware would not be able to do damage.

If the European Union or any other countries would be concerned by the security risk posed by malicious firmware, the solution is simple and it does not consist in banning the products of some arbitrarily chosen countries, but in mandating that any product with an embedded computer, regardless of its origin, must provide complete documentation, i.e. schematics and the source program for the firmware, and it should allow the replacement of the firmware. This would be nothing new, as this is how computers, including the IBM PC, were sold in the old times, before the vendors succeeded step by step to incline the balance of power in their favor and in the detriment of their customers.

First of all there is no alternative that makes sense. Climate change is real and its consequences are more expensive and catastrophic than any trade-offs we’ll have to make for a 100% renewable grid.

The good news is that going 100% renewable is probably less onerous than most people expect. If we get our act together politically, we can easily build the grids, generation, storage and intelligent loads required. With the exception of a few industrial processes, the technology is already existing and economically viable, but it also gets better and cheaper every year.

I never get why people are so opposed to renewables. In the past (and apparently present), we have spent multiples of what we’d need for 100% renewables on stupid wars. Now we could transform our economy with dramatic positive consequences even if we ignore climate change completely (think air quality and corresponding public health concerns, as well as political risks associated with fossil fuels).

It will be one of the breakthrough developments of human civilization and unlock tremendous potential, but people are concerned with the aesthetics of windmills and bickering about minor subsidies, while there is literally an economic crisis going on because some ships with liquified dinosaurs on boats can’t get to their destination on time …

At scale.

Neither could French nuclear plants when they were turned off for weeks at a time for emergency maintenance.

So, France fired up the gas.

5x cheaper electricity, on the other hand, makes power-to-gas economic, which can smooth out seasonal variations in a carbon neutral way.

It's windy and sunny in the winter too.

Ahhhhhhh . . . it's Australia.

Winters here have more sunshine than UK summers.