Posted by toomuchtodo 3 days ago
The build teams aren't that big - 30-50 people. The main barrier to entry is that it takes people who know how to hand-build big transformers. Utility buyers want a supplier who's going to be around half a century from now, since these things last that long.
Here's a summary of the market, from a transformer maker in China.[1]
Here's an AI-generated fake video of large transformer manufacturing. It's about half wrong.[2] But right enough to be worth watching. I'd like to see the prompts for this.
Virginia Transformer is the US's biggest maker of large transformers.[3] They advertise their "short lead times" of two years. The margins are low, and makers don't want to go idle between orders. This is a problem with much heavy machinery. It could be built faster, but when you catch up, everybody gets laid off and the factory sits idle. There goes your profit margin.
[1] https://energypowertransformer.com/2025-u-s-power-transforme...
Now that it's gone we're ultra dependent on a by-product of methane extraction and liquification for LNG transport. But most of the helium we extract as natural gas is not separated, as it just gets piped as gas. Helium is getting very very expensive.
But amplifying the orders just makes the problem worse.
That means that eventually the factory goes idle, when all the demand is serviced by the spares.
The problem expressed, I think, that it is not useful to scale up production quickly (or perhaps at all), because a factory catching up on all of their orders means that the factory goes idle. Idle factories can't afford to pay wages, so they lay off some or all of the workers -- and those folks go and find different jobs.
And when they leave, they take their institutional knowledge with them.
So the sustainable goal is to never be idle, and the way to accomplish this is to never catch up.
For an example of how idle factories can go sideways, look at the Polaroid film story: Polaroid closed. Everyone left. Some investors with a big dream eventually bought many of the physical assets that remained.
But owning some manufacturing equipment didn't help them much because the institutional knowledge of producing Polaroid film had already evaporated. They had to largely re-invent the process. (And they've done a great job of that, but it's still not the same film as the OG Polaroid was.)
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So anyway, suppose the government steps in and simply artificially multiplies transformer orders x2, and pays them fairly for this doubled production. Since transformers are tangible things and we can't just spin up more AWS instances to cover demand, the immediate result is that the "short" lead time on new orders has increased from 2 years, to 4.
That's not seeming to be very ideal. It seems to amplify the problem instead of resolve it.
I suppose that the government could also offer safeguards that would help protect the businesses (including suppliers for parts) once they eventually catch up on orders, and that this might motivate them to scale production sooner instead of later (or never).
Which -- you know -- that isn't unprecedented. As an example: The Lima Army Tank Plant, in Lima, Ohio, is place where I've spent a fair bit of quality time. It still exists and continuously has employees largely because the institutional knowledge of how to build tanks (and a few other war machines) is considered to be too important to lose. During lulls, it mostly just sits there on its expansive site, loafing along repairing stuff that comes in, and waiting for the day when things to turn bad enough that we need to start increasing our number of tanks again.
It needs to keep operating (at any expense), and so with the magic of the government money-printing machine: It does. But it's one of the most actively depressing industrial sites I've ever been to; like the life just gets sucked right out of you before even getting past the entrance gate.
We can certainly extend that kind of thing to transformer production. But should we?
I mean: I've got some MREs in the pantry along with some other shelf-stable food, and I've got some water stored (primarily to fill empty space in the chest freezer for various practical reasons, but it exists). I keep some basic first aid and survival stuff in the car (bandages, space blankets, stuff to catch fish with, stuff to cook with). I've got my camping gear, including a small off-grid solar power system, stored in organized totes that can be loaded up very quickly. And I try to keep a minimum of a couple hundred miles worth of fuel in the gas tank at all times.
I do these things just in case. The bulkiest items see frequent use. None of this cost me very much to buy, or to maintain. And none of these things can replace the lifestyle I've come to expect, but they might be able to buy me some time.
Can we afford to have a spare copy of the hard-to-produce parts of the electrical grid sitting in a warehouse?
Would we even want to rebuild the grid in the same shape if the shit really hit the fan and we had to start it over from scratch?
Remember that the product has a typical lifetime measured in decades, there are huge numbers of large power transformers that have been in near continuous operation for over half a century. When one of those fails it is often more economical to repair it than replace it with a new one but that depends on there being institutions that understand what was done fifty years ago. All this requires the opposite of modern move fast and break things investing.
> At the end of the 19th century, when electricity was just starting to become a commercial source of energy, two businessmen fought to control its future in what came to be known as “the war of the currents.” Thomas Edison promoted the use of direct current (DC) and George Westinghouse, inventor and industrialist, was convinced that alternating current (AC) would prove more practical.
> In a clash of personality, finance and some genuine technical advantages, Westinghouse won out and the world has been mostly stuck with using AC as a means of generating and transmitting electricity. Transformers are necessary to make the AC system work.
This entire section is a glaring load of nonsense and needs to be removed. We had to start with AC for a variety of technical reasons, the main one being that boosting DC voltage pre-switching technology was impossible. DC cant pass through a transformer unless it is converted to some form of AC, usually in the form of PWM square waves these days. Before the invention of the mercury arc rectifier (And later valve) in 1902 you had boost DC using mechanical methods: generators. The problem there is physical, they did not have the ability to insulate the generator windings at high voltage potentials. They also had problems with DC voltages over 2000 volts on commutators [1] citing excessive arcing. Commutators are also a limiting factor in machine size as beyond several MW they dissipate too much power. So with all this the highest practical voltage for a DC grid using early electrical machinery is around 2 kV. Now imagine all that mechanical complexity on the distribution end. Meanwhile, early AC transmission was already in the tens of kilovolts: 11/22/33 kV (multiples of the early Edison 110 volt standard.)
As for the whole war of currents, I feel it is vastly overstated and was more a public spectacle than serious scientific dispute. It was already known from early on that AC was the future thanks to its ability to easily be transformed to higher voltages for transmission and back again with no moving parts. The "war" was likely Edison marketing to sell off the remaining inventory less desirable DC machinery.
What is a current (pun!) practical limit?
If a 100MW PV farm and a data center are separated by 1km (20 Olympic pools) - is there a way to avoid AC?
I know there are future solutions [1]
[1] https://techcrunch.com/2025/04/07/former-tesla-exec-drew-bag...
The rules are changing because of switchmode voltage conversion, using transistors to switch the voltage at a high frequency, where the magnetics (transformers, inductors) can be much smaller and more efficient, then converting back to DC. This is how virtually all smaller power supplies have been made for years, the only question (which I don't know) being how far along we are at reaching the voltage levels of long distance transmission in this way.
I'd think that hustling us towards DC with electronic voltage conversion would be a reasonable strategic goal for dealing with the transformer problem, worthy of support by a government.
However, DC does not make sense for a radial power distribution network. The article is propagating nonsense.
Consider also that there is nothing existing in transmission and switching gear certified for HVDC it being rare one-off projects so far, while AC is ubiquitious, more-or-less mass-produced and many people are trained in its maintenance.
Think of it as analogous to USB-C power, on the megawatt/gigawatt scale. ;-)
But even fairly small standard specification distribution transformers are custom designs or very short runs. It's not economical to make the same design year after year because the relative prices of copper and core steel vary over time. A design made last year can be uneconomical to make this year because last year copper was relatively cheap so the designer used a lighter core and more copper to achieve the required efficiency. But if this year the copper price has gone up while the core steel price has gone down it would cost more to make the same design while the same specification could be achieved for a lower material cost by making a new design.
The new design is not a new type and for distribution transformers the effort required to design it is of the order of a man hour or two, far less than the difference in material costs.
For very large transformers (megavolt HVDC for instance) the situation is somewhat different and the design can take a very long time. But the opportunities for standardisation are relatively small because the quantity of units in the market is small and the manufacturers and regulators are always chasing ever greater efficiencies.
A far as specifications go there is already quite a lot of standardisation. But standards evolve over time and transformers can last for over half a century so you inevitably end up with a mixture of device types
Also, if one of your paralleled large power transformers fails you can't just buy an off the shelf replacement because no one keeps a stock of items that cost a million dollars each.
Switching to USB-C was trivial because most of the devices involved are essentially consumables with lifetimes measured in handfuls of years ad often much less so the old stuff withers away rapidly. That is not the case with large capital projects such as national electrical networks
I challenge you to name one that cannot and that also makes it into high school curricula or How Things Work.
https://mst3k.fandom.com/wiki/A_Case_of_Spring_Fever_(short)
https://m.youtube.com/watch?v=vzKfAFsbRSk
If you are not ready to lock yourself in a bunker after reading the article and watching that short, I strongly suggest you consider the inclined plane.
You’d better do it now. Very few locks work in the absence of transformers, springs and inclined planes.
This isn't quite wrong but the motivation is backwards: AC is necessary to make transformers work.
1. All grids need to move energy at high voltage and low current to minimize losses.
2. This requires a mechanism to step voltages up and down for transmission.
3. In 1890 the only such mechanism was the transformer.
4. Transformers only work on AC, not DC.
Hence our legacy grid is AC.
Nowadays we have an additional mechanism: Power electronics. Power electronics work on both AC and DC, so transformers with their huge requirements for copper and steel are no longer necessary.
We need to accelerate the transition of our grid to DC because DC grids are simpler and cheaper than AC grids.
Meaningful grid security means these items need rapid, standardized, domestic production capacity and cold spares distributed offsite and ready to be deployed should anything happen to ones in use. These are critical items that must not be neglected to reactive actions disaster recovery.
https://en.wikipedia.org/wiki/Metcalf_sniper_attack
https://en.wikipedia.org/wiki/Moore_County_substation_attack
https://en.wikipedia.org/wiki/Electrical_grid_security_in_th...
Maybe the grid needs a multi-source agreement for equipment like the network industry has for optics.
The water system shuts down because the tanks aren't reserve supply they're pressure support.
And solar plus storage will keep you running for maybe a week if you're conservative and mostly don't use anything...which doesn't help you if it's months till replacement.
Which have days worth of backup generator power
> refrigerated food distribution
Do you think refrigerated trucks trail big long extension leads to a socket somewhere?