Climate & Energy · Wednesday, 26 August 2026

01 · Briefing · what happened

Three gigawatts of demand vanished from the grid in seconds, and every data centre that did it was working perfectly

Climate & Energy 1 min 31 sources

On 22 July, a fault in Northern Virginia made data centres flip to backup power all at once. The grid was built for supply to fail, not for demand to disappear. Ireland, Texas and Virginia have now all seen the same thing.

3 GW

demand lost in seconds

about 3% of everything the grid was serving [1]

500 ms

Ireland's proposed limit

to restore 90% of demand after a fault clears [1]

387 MW

Ireland's largest such drop

in May 2025, up from 74 MW in January 2022 [1]

$6bn

US grid congestion cost

on the largest US grid, this year alone [3]

At a glance

At 7:56am on 22 July, sensors picked up a major transmission disturbance in Northern Virginia. [1]
More than 3 GW of demand - about 3% of everything the system was serving at that moment - went offline within seconds as data centres transferred to backup power. [1]
Nothing broke. Every facility did precisely what its protection settings told it to do, at the same instant, because they are all set the same way. [1]
The grid operator said there was no reliability impact and the utility said conditions were stabilised within minutes. Both are true, and neither is the point. [1]
The point is that a power system is built for the supply side to fail. Demand is the thing that is supposed to stay put. [1]
Texas has already logged eight events between November 2020 and March 2023 where a fault near one big industrial load cut demand by 400 to 700 MW. [1]
In December 2022 a breaker failure in West Texas took about 1,560 MW of demand off in one go, of which oil and gas facilities accounted for roughly 420 MW. [1]
Ireland's operators have documented four data-centre demand drops on their 220-kV network: 74 MW, 204 MW, 321 MW and 387 MW - and the size is climbing each time. [1]
Ireland has drafted an actual rule: a facility could drop to backup during a voltage dip, but would have to restore at least 90% of its demand within 500 milliseconds. It is still under consideration. [1]
Almost every public argument about large loads is about whether they can be connected - the generation, the wires, who pays. Almost none of it is about how they behave once they are running. [1]
A data centre can buy its own generation, fund the network upgrades, meet every connection obligation, and still present a risk nobody has modelled. [1]
The largest US grid has separately watched its congestion costs reach $6bn this year, and now wants data centres to bring their own power or face cutoffs. [2][3]
Global electricity demand is forecast to grow 3.6% a year to 2030, and New York's grid is already struggling with the heat before any of that arrives. [7][8]
The same grid that lost 3 GW in seconds has just cleared more than 50 GW of solar, wind and batteries to connect - capacity that will only help if it actually gets built. [4]

Forces in play

Loads that can leave High↑

3 GW off in seconds in Virginia, and Ireland's events have grown from 74 MW to 387 MW in three years [1]

Rules for how loads behave High→

Ireland has drafted a 500-millisecond restoration requirement and it is still under regulatory consideration [1]

Cost of moving power High↑

congestion on the largest US grid now costs $6bn a year, before any of this [3]

Flexible demand Easing

demand that can move on purpose is being built out deliberately, and it is the same capability that misfires here [6]

In play Northern Virginia's data centres — did exactly what they were configured to do, together PJM and Dominion — stabilised it in minutes and reported no reliability impact EirGrid and SONI — the only operators so far to draft an actual rule ERCOT — logged eight of these before anyone was calling it a pattern

How it unfolded

Nov 2020-Mar 2023 Texas logs eight demand-drop events of 400 to 700 MW near one industrial load [1]
Dec 2022 a breaker failure in West Texas removes about 1,560 MW of demand [1]
Jan 2022-May 2025 Ireland records four events, growing from 74 MW to 387 MW [1]
22 Jul 2026 Northern Virginia loses more than 3 GW in seconds [1]

Where this points

The number to watch is not the next outage but whether any regulator outside Ireland writes a behaviour rule: until one does, every new connection adds capability to disappear that nobody has measured.

Also today

9 more stories on this beat.

British bills rise 4%, and the debt rises faster

Ofgem will raise the energy price cap by 4% from October, blaming higher wholesale gas prices from the Iran war. Household energy debt has already climbed about 500m pounds in a year to a record 6bn at the end of June, and the industry body expects 7bn by December. [9][10]

Why it matters — The rise more than wipes out the new government's VAT cut on electricity, which was meant to give households breathing space. The debt is where the strain actually shows - months after the price moved. [10][11]
The war reached the gas market, and the gas market reached everyone

The IEA says the Middle East crisis has dealt a major supply shock to global gas, reversing an easing that had been under way. Europe and Asia are responding by accelerating renewables. [12][13]

Why it matters — The fastest route from a strait nobody in Britain can find on a map to a bill on a British kitchen table is about six weeks long.
Two ways to remove the public from a decision

In Ohio, clean-energy and good-government groups want action against entities filing seemingly fake public comments against clean energy projects. In Texas, the elected oil and gas regulators voted 2-1 to drop the guaranteed public-comment slot from their monthly meetings, replacing it with listening sessions the commissioners do not attend. [14][15]

Why it matters — People travel hundreds of miles from the Permian Basin and the Gulf Coast for three minutes at that microphone. Flooding a process and closing a process end in the same place.
A hotter summer, counted three ways

New analysis finds climate change now exposes 580 million children to 20 additional heat-stress days a year. Chicago emergency rooms report a toll going well beyond heatstroke, S&P warns European heatwaves are starting to threaten insurers' earnings as the population ages - and solar output is credited with carrying Europe's grid through the worst of it. [16][17][18][19]

Why it matters — Insurers are pricing the heat before health systems are counting it. And the weather making the heatwave worse is the same weather getting the grid through it.
A quarter of new European cars are electric

Battery-electric vehicles topped 25% of the European market in July, driven by France and Germany. Australia's EV sales have reached 23.4% of new cars and its charging network is already struggling to keep pace. Geely is preparing a 500 Wh/kg solid-state cell - roughly twice the energy per kilogram of today's best packs. [20][21][22]

Why it matters — The bottleneck has moved from the car to everything around it: chargers, grid connections, and who pays for both.
Nevada sues over the Colorado cuts

Nevada has sued the federal government over the Colorado River restrictions, arguing officials did not impose mandatory cuts on the upper-basin states. [23]

Why it matters — The first state to move from objecting to litigating usually sets the venue for everyone who follows.
The North Sea argument, with numbers

Analysis published this week finds the climate damage from new North Sea fields would obliterate any economic benefit, calling the bills-and-security case a delusion - as Britain's new prime minister decides on Rosebank. Meanwhile Washington has spent billions boosting gas exports and more fracking with it. [24][25][26]

Why it matters — Both governments are making the same bet in opposite political directions, and neither has published the arithmetic the other side is using.
Offshore wind is flailing where it is needed most

East Coast offshore wind projects - the region's best answer to its own demand growth - are stalling under federal opposition and economic headwinds, while the administration pours money into batteries it will not describe as clean energy. [27][28]

Why it matters — Storage is being funded because it matters to AI and defence. The label decides the budget line, not the physics.
The bills are being set by forecasts nobody agrees on

Utilities using conflicting demand forecasts to justify both gas and electric investment are pushing bills up on both. America's hydropower is weakening well beyond the drought-hit West, and the US-Canada trade war now threatens cross-border electricity imports and prices. [29][30][31]

Why it matters — Three different ways for a household bill to rise that have nothing to do with how much power that household used.

02 · Lesson · why it matters

Everybody did the right thing at the same moment

Protection that is correct for one machine becomes a shock to the whole system when every machine has the same settings.

How it works

Each facility protects itself when the voltage dips
Switching to backup is exactly the right move, for it
Every facility uses the same protection settings
So they all do the right thing in the same instant
The grid sees one enormous coordinated disappearance
And the safer each one made itself, the worse that is

The twist

Individual reliability and collective reliability can be opposites. Every data centre that flipped to backup was protecting itself correctly - and the correctness is what made it a system event, because correct means identical and identical means simultaneous.

Where you've seen this

Bank runs

withdrawing your money when a bank looks shaky is sensible for you and is the thing that brings it down

Stop-loss selling

every trader's automatic exit is prudent alone and becomes a crash when they are all set at similar levels

Evacuating by car

leaving early is right for one family and produces the jam that traps everybody

Antibiotics

prescribing them is right for the patient in front of you and builds the resistance that ends the drug

The catch

The fix is not to make each facility less safe. It is to make them differ - staggered settings, required ride-through, restoration within a defined window. Diversity, not fragility, is what the grid is actually missing.

And the whole of it

Nobody in this story did anything wrong. The engineer set the protection to industry practice. The operator reported, accurately, that nothing failed. The regulator is busy with whether the next connection can be built at all. Everyone is looking at their own square of it, and the risk lives precisely in the space between the squares - which is where most system risk has always lived.

03 · Lab · your turn

All At Once

Configure 100 data centres, drop the voltage, and watch identical protection settings turn a hundred correct decisions into one grid-scale shock.

04 · Truth · what's really going on

Stripped of the framing

The public argument about data centres is entirely about whether they can be connected - the wires, the generation, who pays. Almost nobody is asking how a 3-gigawatt customer behaves once it is switched on, and Ireland is the only place that has written a rule about it.

Why it lands — 'No reliability impact' is a true sentence that ends a conversation. It answers the question anyone would ask - did the lights go out? - and quietly retires the question worth asking, which is what happens the fourth time, at twice the size.

Claimed

What people said. Not yet a fact.

The grid operator

The disturbance caused no reliability impact. [1]

Almost certainly correct about that morning. It is a statement about an outcome, not about the margin it was won by, and the reporting does not say how close it came.
The utility

Operators stabilised conditions and returned the system to normal within minutes. [1]

Also a claim about recovery, not about exposure. Both statements would be equally true if the event had been twice as large and still recoverable - and equally true right up until one was not.
The industry framing generally

The large-load question is a build question: enough generation, enough transmission, who funds the upgrades. [1]

This framing is not wrong. It is incomplete in a specific and self-serving direction - it is the version of the problem that money and permits can solve.

Verified

What we could actually stand behind.

More than 3 GW - about 3% of system demand - disconnected within seconds on 22 July. [1]

How we checked — Independent sensor analysis detected the disturbance and the grid operator subsequently confirmed the volume. Two parties, one of them not the operator.
This has happened repeatedly elsewhere: eight Texas events between 2020 and 2023, and four Irish events growing from 74 MW to 387 MW. [1]

How we checked — Documented by the system operators themselves, with dates and megawatt figures for each - the strongest kind of evidence available here, because it is self-reported against interest.
Ireland has drafted a specific behavioural requirement: restore 90% of demand within 500 milliseconds after a fault clears. [1]

How we checked — A named grid-code modification with a number in it, still under regulatory consideration - so it is a real proposal, and not yet a rule.

Nobody knows

Open questions — ours included.

How close 22 July actually came to being serious.

Both the operator and the utility described the outcome. Neither published the margin, and nothing in the reporting says what would have happened at 6 GW instead of 3. [1]
How many facilities share identical protection settings.

This is the whole risk and nobody has published it. The proposal in Ireland asks for verified as-built models precisely because operators do not currently have them. [1]
Whether any US regulator will write a behaviour rule.

Ireland's is under consideration. Nothing in the day's reporting indicates a comparable US proposal exists. [1]
How much of Britain's 4% cap rise is the war and how much is everything else.

The regulator attributes it to wholesale gas prices from the Iran conflict and supply disruptions. No breakdown between the two is published. [9]

Who gains

Data centre operators — Instant transfer to backup is the feature they sell - uptime - and the cost of that feature currently lands on the grid rather than on their own bill. [1]
Onsite generation vendors — Grid bottlenecks are already pushing businesses toward bigger private power systems, which is the same logic one layer down: leave the shared system rather than fix it. [5]
Energy suppliers in Britain — A household that cannot pay a capped bill becomes a debtor rather than a lost customer, and 6bn pounds of arrears is a receivable, not a write-off. [10]

Who pays

Everyone else on the same grid — A 3 GW disappearance is absorbed by reserves that all customers fund, and the congestion costs on that grid alone are running at $6bn a year. [1][3]
British households in arrears — Energy debt rose about 500m pounds in a year to a record 6bn, and the industry itself expects 7bn by December. The 4% rise more than cancels the VAT cut meant to relieve it. [9][10][11]
People who travel to speak — In Texas, the guaranteed public-comment slot is gone, replaced by sessions the commissioners do not attend - after residents routinely drove hundreds of miles for three minutes. [15]

05 · Hope · carry this

Ireland saw four of these before anyone called it a pattern, then wrote a number into a draft rule: ninety per cent of demand back within half a second. The smallest grid operator involved has produced the first real answer.