AukeHoekstra Profile picture
Mar 16, 2024 15 tweets 5 min read Read on X
Grid congestion is THE bottleneck for economic growth and sustainability in the Netherlands.

But it doesn't have to be!

When we combine Dynamic Line Rating with Peak Shaving we could move three times more electricity with the current grid!
🧵 Image
What is Peak Shaving?

Peak shaving means that you take measures to lower the peaks in electricity usage. Peaks are what limits use of a power line. In the example graph below you can see the demand is too high a few yours per week. But there is more than enough capacity overall Image
Adjusting only the 2.5% of electricity demand that causes the biggest peaks adds 25% of capacity.

Removing 17% of energy from the peaks (e.g. with dynamic pricing, batteries, smart charging, etc. etc.) provides 50% more capacity.

But now we add dynamic line rating! Image
What is Dynamic Line Rating (DLR)?

Currently grid operators use static line rating (SLR) which means they use one number for the amount of electricity that a power line can carry.

But in reality, it's the heat that is limiting.

Max power is different for each point in time. Image
Dynamic line rating takes this into account, either by measuring (e.g. the temperature) in real time or by using a model that estimates the power a line or transformer can handle for every time step.

I asked ChatGTP (warning again) to create an example.
irena.org/-/media/Files/…
Image
If we add dynamic line rating, all of a sudden the load duration curve looks very different. It turns out we are not even close to the maximum capacity!

The static line rating gave us bad advice and cheated companies out of a grid connection! Image
It gets even better when we combine dynamic line rating with peak shaving. In the graph you can see that shaving off just 12.5% of energy from the peaks gives you THREE TIMES the carrying capacity of your grid! Image
I'm NOT saying this makes grid new power-lines & transformers unnecessary!

I AM saying that dynamic line rating + peak shaving could make a comparable difference for a tiny fraction of the cost and can solve our grid congestion woes much faster.

What are we waiting for?
/end
Wow: a lot of pushback.

To clarify:
- I'm not saying this will be trivial
- I'm not claiming 3x more capacity will result

Maybe it will be 'just' 2x more capacity if we combine peak shaving with DLR and all the other stuff that dynamically impacts our grid.

That's still huge!
This smart approach is also very cost effective. Where grid reinforcements cost 250 billion over the next 20 years, smart measures often pay for themselves because they e.g. avoid storage.
And on top of that, smart interventions promise results faster, which means they accelerate the energy transition and economic growth.

Simply put: we save gigatons of emissions, tens of thousands of jobs, and billions in wealth if we implement smart solutions quickly.
I often propose we invest 1/10th of the investment in grid reinforcement for smart solutions.

That's tens of thousands of people during ten years.

As I said: not trivial.
Even if we are less ambitious the rewards will be huge.

@JigarShahDC provided a ballpark for the low hanging fruit: 30% more capacity with $10 billion investment in the US grid.


Since NL has ~20x less people,
we might get 30% more for just 500 million!
Countries taking the lead will establish great jobs at home and be at the forefront of a lucrative international market for creating cost effective smart grids.

To my fellow Dutchmen I want to say:
"Wake up! This is what the Dutch are supposed to be good at!"
I admit these are rough first calculations.
More illustrations really.

But I really don't understand why there isn't a massive push to ask the grid operators for open dynamic grid data. And to reward those that use it to provide flexibility.

There is SO MUCH to be gained!
/end

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More from @AukeHoekstra

Oct 4
The grid is transitioning from a fragile fossil grid to a resilient renewable grid.

Some people don't want to understand this and confuse their lack of understanding with wisdom.

Let me explain once again what @Bjoern_Peters and many others don't understand.
🧵
Bjoern talks about "spinning masses" to keep frequency constant, as if that's super important.
And in the old grid it is.
That's why I compare the old grid to a record player.

Here's a longer thread with details.
It has a sub-thread on Spain.
Image
But the new grid has what I call digital power transformers (DPTs).

Basically a computer chip is driving a couple of power transistors. It works like a digital amplifier or your new and light laptop charger.
energy-storage.news/demystifying-s…

frontiersin.org/journals/energ…
Read 11 tweets
Jun 17
The official report on the blackout in Spain and Portugal is just released. I'll give a quick summary of findings and provide some additional info.

TL;DR
conventional power plants didn't control the voltage as planned
over-voltage caused renewables to turn off as required
The report (of which only press reports are available) points the finger to

1 conventional backup plant taken offline for maintenance without replacement being arranged

9 other conventional backup plants, of which every one had a degree of non-compliance
uk.news.yahoo.com/spain-reveals-…
Renewables also had a role: "tension was very high and sustained, causing the disconnection of generators".


An inside source tells me the voltage went above 110% in many places and solar was required to switch off, which meant 8GW was lost all at once.elpais.com/economia/2025-…
Read 5 tweets
Jun 10
Just made a visualization for myself about the unprecedented growth in solar that I thought I might share.

From 1880 to 1950 all electricity came from fossil+hydro. Then nuclear briefly grew with market share increasing with up to 1% per year in 1985.

Now solar takes over. Image
I've described in more detail in a substack post:

There's more info on each picture there.aukehoekstra.substack.com/p/the-coming-s…
I made this picture because I think you forget what is happening when you look at total final energy. Renewables seem so tiny! Image
Read 8 tweets
Jun 9
I see this a lot:

Conservatives who *just know* that nuclear is better than solar and thus blame their favorite scapegoat *the government* for solar doing better.

But in reality it's the opposite: the market likes solar so much that not even the government can save nuclear.
I guess Andre's attention for me is due to my being irritated at his fact free diatribes of pseudo-scientific nonsense:


So now he sees reacting to me as a way to get attention?
And I'm reacting again, so maybe I'm being duped?
Anyhow...
Let's start with some quantifiable facts. (Things this conservative armchair energy philosopher is allergic to.)
First thing we notice is that solar and wind are clearly surpassing nuclear (though the new leadership of the department of energy denies it).
Image
Read 19 tweets
May 18
Many people think solar and wind won't be able to keep the grid stable because they lack "inertia".

I think solar, wind and batteries will do a BETTER job and I think you can explain it thus:
- the old grid is a record player
- the new grid a digital player
🧵 Image
If you play vinyl records, the rotating mass of the turntable is used to keep the speed steady. This leads some vinyl enthusiasts to seek more mass because that will keep things more steady.

This turntable by Excel audio attaches a separate mass. (Overkill but makes my point.) Image
In the same way the inertia in the rotors of current power plants helps the grid to keep a steady 50 Hz (in e.g. Europe) or 60 Hz (in e.g. the US) frequency.

These machines turn a heavy copper coil wound around a heavy iron core and this helps keep the grid frequency steady. Image
Read 21 tweets
Aug 13, 2024
Great to see more and more attention for flexible grid pricing.

We must say goodbye to the "copper plate" that offers free power everywhere and every time. It's hideously expensive and outdated.

What we need is smart flexibility.
🧵
The underlying reason is that the costs of different components of the energy system changed:

Some remained high (e.g. pylons, fossil & nuclear)

Some plummeted (e.g. solar, wind, batteries, EVs & inverters)

Some became possible at all (e.g. measuring & steering in real time)
So now we should make good use of these new, clean, abundant and affordable options, even if it means doing things a bit differently than before.

So what should we do different regarding grid congestion pricing?
Read 20 tweets

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