back to article Marauding monkey blacks out Kenya

Kenya yesterday suffered a four-hour nationwide blackout caused by a monkey tripping a transformer at a hydroelectric power plant. 'Leccy producer KenGen said: "At 1129 hours this morning, a monkey climbed on the roof of Gitaru Power Station and dropped onto a transformer tripping it. This caused other machines at the power …



Wait. What?

So this power station produces about 3.5% of the whole national electricity output? I can understand there might be some localised problems losing this station, but a nationwide blackout?

Oor Nonny-Muss

Re: Huh?

The sudden loss of a large supply means the rest of the grid gets a "shock wave" which means that other lines can become overloaded and protection kicks in. Cascading failure...

Common when there's little supply overcapacity compared to demand... and why the UK imports electricity from France on such a regular basis.

Marc 25

Re: Huh?

Yup cascading power failures are a real threat. When you combine them with something like an EMP over a major plant in Europe or America, you could basically move an entire continent back to the Dark Ages.

Repair times are not quick either, as transformers get damaged. I think I saw a stat somewhere that said if the whole of Europe went down, the worlds total manufacturing output for 10 years would need to be dedicated to rebuilding transformers and the rest of the burnt out grid.

Securing power plant from Electromagnetic Pulse threats have been serious investigations for the EU, UK and America since 2013...

Silver badge

Re: Huh?

There's a good background here. on how just a single problem in one part of the system puts so much stress on the surrounding parts that have to take up the load that it swiftly spreads and, well, takes down the electricity grid for millions of people.

The short version is that unless every part of the system can cope with that 3.5% change in load, then candle prices will rise.

Voland's right hand
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Re: Huh?

You are not familiar with the "smart metering" attack.

It is sufficient to turn 2-4% on/off at once with no prior notice for the grid to start shedding connections. If this is not calculated correctly (or in the case of an attack if the sequence of on/offs is malicious) the whole grid can collapse completely (*).

So all it takes is one monkey - either at a big enough power plant or one high enough in relevant government department. There is little difference between failing to protect the grid feed transformer and deciding to install smart meters with uploadable firmware into every house (and someone backdooring it with a trigger sequence).

The result is all the same.

(*)It is now 20+ years since I last helped my dad with computations in optimal control of grid load "management" so the 2-4% number is off the top of my head.

Dave 32

Re: Huh?

It's called a "Cascading Failure", and we have had experience with it in North America. All it took was for one tiny little tree branch to contact one phase of a electric transmission line, and a very large portion of the northeastern US and eastern Canada went dark, in some areas for up to two weeks. That one transmission line that experienced the fault went off-line. Incorrect network management software didn't spot that failure, and adjacent transmission lines were overloaded while taking on the load of that first transmission line, which caused them to go off-line. As more and more transmission lines overloaded and tripped off-line, power plants started seeing over/under-load conditions, and would go off-line, including a couple of nuclear plants that had the reactors scrammed. Restarting those was a fairly intensive process. And, all because of one tiny little tree branch.



Re: Huh?

Some very interesting reading there folks, thanks for the info. I know that power companies prepared for variation of load on the network, but had no idea it was all so finely balanced!

Alan Brown
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Re: Huh?

"Securing power plant from Electromagnetic Pulse threats have been serious investigations for the EU, UK and America since 2013..."

Earlier than that. The risk has been written about for more than 2 decades and seriously investigated by governments since 2003 or so. It turns out that securing against EMP (solar flares are more likely problems) is relatively straightforward but adds cost to the installation(*). Power companies being power companies, they decided the extra spend wasn't worth it (as with all private companies, they won't add redundancy unless it adds to the bottom line or are forced to do it. Brakes on railway carriages come to mine....)

USA regulators have been jumping up and down about this for a while, hence the STEP program, but it took 10 years after the dangers were pointed out before it even got started.

(*) Advocacy groups say hardening the US distribution grid would cost $2billion, industry says $20 billion. When a single airport building (Heathrow T5) or urban rail project (Crossrail) can cost about the same, it's small beer in the overall scheme of things if that amount of money needs to be spent across a nation's entire infrastructure.

Silver badge

Re: Huh?

Whether its $2 or $20 billion, if that number is even remotely correct, it is a small price to pay for insurance against what would happen if an EMP (natural or otherwise) took out the US grid. If the industry is looking for an excuse to raise my prices a few percent to pay for this, please do!

Silver badge

Re: Huh?

All it needs is sufficient, sudden, loss of online capacity to slow the rest of the generators down due to overloading - once you're more than 3 or 4 Hz down on nominal frequency it's all over - a black restart is needed and this can take a long time as the load being connected has to be matched closely to the online generation capacity to avoid 'rinse and repeat' situations.

Of course, if the station you lose is currently the frequency setter for the network ie., it's big enough to drag all the others into line speed wise, then you've suddenly got a whole heap of small generators, under excessive load, with no flywheel effect from the frequency setter to keep them stable.

Silver badge

Re: Huh?

All it took was several tree branches, a staff so clueless they took down their only reactive power generatng station for maintenance during the month of peak reactive power demand, a staff so clueless that when told there were shorts being seen relied on (frozen) computreized instrumentation and said "eyewitnesses? Pshaw!", an IT staff so disconnected with the core business that they fluffed the attempt to bring the instrumentation back online until matters were well and truly out of claw and a staff so clueless they didn't factor their offlined power generation facility as a "level one failover" and so were "working the problem" from the wrong scenario in their playbook.

There is a wealth of detail in the official report. Failing to trim trees was just the first of many ways that that Ohio-based "power utility" failed to perform their duties with due dilligance.

But that's what happens when you fire all the old hands and grab yourself a new staff who haven't a clue.

Arguably, the monkey could have done the job better.

Silver badge

Re: Huh?

"The short version is that unless every part of the system can cope with that 3.5% change in load, then candle prices will rise."

Hey, Grubbymint Greenies! STILL think that unsecured smart meters are a good idea??

It wasnt me

Re: Huh?

" I think I saw a stat somewhere"

Really? Where? Cos it sounds like complete and utter cr@p.

You really need to cite references round here or it sounds like you're just making stuff up.

Power cut into the dark ages? Wtf?

Marc 25

Re: Huh?

Really? Where? Cos it sounds like complete and utter cr@p.

It was in an Nation Research Council report titled "Terrorism and the Electric Power Delivery System". The report has been summarised many times by scientific website, all over the interweb.

Maybe have a google and consider the idea that I might not be lying rather than swearing at me and calling me a liar. It's kind rude.

Rich 11
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That animal certainly put a monkey wrench in the works.

thomas k

In a startling reversal of roles ...

monkey spanks man.

Marc 25

Re: In a startling reversal of roles ...

great punage. Have an upvote!

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Electric fence?

To keep out a monkey that can trip out a whole hydro plant AND ESCAPE UNSCATHED?


Paul Westerman

Re: Electric fence?

yes, someone made a bit of a howler there

Silver badge

Re: Electric fence?

"To keep out a monkey that can trip out a whole hydro plant AND ESCAPE UNSCATHED?"

I have my suspicions that there were at least 2 monkeys. The one that actually caused the failure was probably instantly cremated with no visible remains and a somewhat surprised witness.

Which begs the question: "Where's the naughty little hole that they use and when will this happen again?"

Sir Barry


Losing electricity must have sent people bananas with that monkey aping around.

Loud Speaker
Bronze badge

Re: Bananas

And there was I listening to "One Money don't stop no show"!

Paul Westerman

Just goes to show

how vulnerable our infrastructure is to gorilla warfare


Re: Just goes to show

many mons ago a monkey ripped the arm off a child that go too near to the fence surrounding it.

At the time we deduced that the parents would be arrested for giving arms to gorillas.

Anonymous Coward
Anonymous Coward

Re: Just goes to show

We had a similar incident not to many miles from school that lead to the following kind of joke:-

What is hairy and has 3 arms and 2 legs?

Xxxx the Bear (names changed to protect the innocent)

Xxxx was a girl bear apparently ....

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Don't give Network Rail ideas

First it was leaves on the track and the wrong sort of snow...

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The monkey jumped

at the chance for a job as a SCADA programmer

cantankerous swineherd
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hanging's too good for them.


"hanging's too good for them."

Monkeys are perfectly capable of swinging from trees without your help.

Little Mouse

Monkey Photo

Is it safe now for photographers to publish photos of monkeys without getting into a copywrite spat with PETA?


Re: Monkey Photo

<quote>Is it safe now for photographers to publish photos of monkeys without getting into a copywrite spat with PETA?</quote>


Glenturret Single Malt

Re: Monkey Photo


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Happened here

but it wasn't a primate. On Oahu a number of years ago a rat got into some underground power cables in downtown Honolulu and downed the island's grid. Cascading failures over a few minutes killed all the power plants. Took quite a few hours to cold start the whole system.

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How did the monkey survive?

Aren't these situations typically caused by a short across the animal? At least in my experience where I've heard about squirrels causing outages, there is generally very little left.

Either the monkey simply pulled a lever that basically turned off / tripped the plant - in which case they need to monkey-proof it somehow - or the monkey was incinerated but they chose to show a picture of a different monkey so they could claim he was unhurt.

x 7
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so what did the monkey do, and how did it survive? Did it piss on something?

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Threw Poo, causing a short without the monkey being in the loop?


We also suffer issues with marauding monkey’s causing problems in Australia

Unfortunately they run the country.


Reminds me of the Not the Nine O'Clock News joke

Something to the effect that "Sabotage was suspected in the country of XXXXX last night as power failed nationally, when traces of Horlicks were found in the donkey."


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