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Kris

@vladh

I used to plan data centers for booking.com and some special expert from Gartner or something asked how much CO2 we would save if booking was written in Golang instead of perl.

Booking filled the equivalent of 40 jumbo jets per day with flights at that time.

The combined daily data center energy use was a few hours of flight of one engine of one jet per day.

I told them to go and stop flights to have an impact, they didn't.

28 comments
Kris

@vladh

Hacking won't help the climate.

Politics can.

Tax billionaires. Ban Bitcoin. Prohibit GenAi. Limit data centers. Tax flight fuel fairly. Ban cars and build public transport. Stop using concrete. Demand heat pumps.

That works.

Kris

@vladh

747 fuel use: quora.com/How-much-fuel-does-a

A 10-hour flight uses about 36,000 gallons including climb, cruise, and landing

135,000 Btu/gallon = 10.45 kWh/l
36000 gallon = 136274.82l = 1424071 kWh

So 4 engines = 142407 kWh,
1 engine = 35601 kWh = 35.6 MWh (or 35.6 MW average power usage)

50.000 data center computers = 10 MW average power usage (including cooling).

@vladh

747 fuel use: quora.com/How-much-fuel-does-a

A 10-hour flight uses about 36,000 gallons including climb, cruise, and landing

135,000 Btu/gallon = 10.45 kWh/l
36000 gallon = 136274.82l = 1424071 kWh

So 4 engines = 142407 kWh,
1 engine = 35601 kWh = 35.6 MWh (or 35.6 MW average power usage)

Kris

@vladh

blog.koehntopp.info/2017/07/19

Power consumption of a Dell R630 blade with 2x Intel E5-2690v4, running mprime95 on 1/56 to 56/56 vCores.

blog.koehntopp.info/2019/10/05
Datra centers and energy usage (before GenAI, which fucked all of us over)

blog.koehntopp.info/2024/07/16
Power usage in a household visualized

@vladh

blog.koehntopp.info/2017/07/19

Power consumption of a Dell R630 blade with 2x Intel E5-2690v4, running mprime95 on 1/56 to 56/56 vCores.

blog.koehntopp.info/2019/10/05
Datra centers and energy usage (before GenAI, which fucked all of us over)

Reinald Kirchner

@isotopp @vladh datacenters are converting electricity to heat. 100%. And are investing even more energy to get rid of the heat.

We need to convert heating of buildings from fossil fuel to electricity.

What, if we combine this two issues: a fridge sized blade center, running at 5kw, selling compute power for cloud-edge-compute, providing local heating/hot water energy. Maybe combined with a heat pump. Would that make any sense?

Kris replied to Reinald

@Reinald @vladh

No.

There is a long answer, but it boils down to

- this has been tried MANY TIMES
- household bandwidth sucks
- if household bandwidth didn't suck, latency still matters. That is bad, because bandwidth = engineering problem, latency = physics problem.

theregister.com/2023/01/12/hea,

and many times before.

""We literally put a Bitcoin miner in a barrel of mineral oil and plumbed it up to a radiator," he told The Register.|
In case you weren't believing the bitcoin numbers above.

@Reinald @vladh

No.

There is a long answer, but it boils down to

- this has been tried MANY TIMES
- household bandwidth sucks
- if household bandwidth didn't suck, latency still matters. That is bad, because bandwidth = engineering problem, latency = physics problem.

theregister.com/2023/01/12/hea,

Kris replied to Kris

@Reinald @vladh

There are attempts to use data center waste heat for domestic heating, but that is not easy at all.

Data center waste heat is around 50 C at most, often less, so you can use it to drive a heat pump, but you can't transport it very well.

If you transport it, it still has to be used very locally. Data centers are often not built on expensive ground close to where people live, though.

Kris replied to Kris

@Reinald @vladh

People need heat in winter. Not in summer.

What are you doing in summer?

What are you doing in winter, if the need for this data center happens to be low and it does NOT produce sufficient waste heat?

You just built a tight coupling of one piece of critical infra with another piece of critical infra. This is usually not a winning strategy.

Tobias Denkinger replied to Reinald

@Reinald
Newly built data centers are sometimes used for district heating.
@isotopp @vladh

Kris replied to Tobias

@denki @Reinald @vladh

Correct, and to some limited amount it even works.

It completely does not scale and it is impossible to retrofit (you can, but tearing down the DC and rebuilding elsewhere, close to where people live, will still be cheaper)

Vlad

@isotopp By the way, I think you’re totally right that politics is most important here, I’m just trying to gather enough data before I rule out the impact of software changes. Sometimes progress can be made by going for smaller scale goals too.

Simon readyandnot

@vladh @isotopp A colleague of mine is writing this thesis on that exact question. I'll ask him in the coming days if he has something to share.

A

@isotopp @vladh not sure you can ban cars in the rural setting. Ultimately maybe self driving trams are the answer but that will take decades

However I agree we need to change behaviours. Here in Scotland we can already produce 140% of electricity by renewables

Why not make electricity free like water, ie included in council tax. Immediately electric heaters and immersion heaters would be used preferentially over fossil fuels. Electric cars would be much more attractive

We need big changes

Kris

@ScotInTraining @vladh

amazon.de/-/en/Peter-Norton-eb
Read this on self-driving anything.

You can start by banning cars within city limits (use a P+R, then use public transport), and then extend from there as your public transport evolves.

Making cars impossible to use conveniently outside of cities and banning them in cities is an excellent start.

A

@isotopp @vladh as a start but we have houses (small holdings, farms etc) miles up gravel tracks. People will need some form of transport and public transport would need to be door to door to replace that.

Having also lived in cities I do agree we don't need cars in cities. Good infrastructure would be so easy to put in without cars. We do also need better delivery services moving stuff about is a big use of cars.

Kris

@ScotInTraining @vladh

"Here in Scotland we can already produce 140% of electricity by renewables"

Schleswig-Holstein, where I was born, similarly. Wind + Solar = literally energy too cheap to meter.

The Netherlands, where I live, will be overprovisioned 2x or more by 2030 (that is around 21 GW of max power demand vs. > 21 GW of solar AND > 21 GW of wind).

The next game is batteries for households and vehicle-to-grid in the 5-11 kW range (most existing cars taht do this do 2.2-3 kW)

Kris

@ScotInTraining @vladh

"Why not make electricity free like water, ie included in council tax."

Water is metered where I live, but yes.

Flatrates for power (You pay a base rate, or tax, it does not matter much) for the first 5 MWh/year are totally a thing that will be coming.

The money is not for the energy, which is free, but for the reliabilty, which comes from having a grid and flexibility and energy storage in batteries.

A replied to Kris

@isotopp @vladh privatised water has failed- just look at England, high prices, poor infrastructure and rivers full of sewage.

The thing about having a meter is you don't need to read them. Swap to a flat rate and use meters for leak monitoring and not billing

Kris replied to A

@ScotInTraining @vladh

Watermanagement is very much NOT privatized in the Netherlands, and the structures that build dikes and manage water are older than any government and exist outside of the government and private industry.

That is because 2/3 of the country are below sea level and without structures for water management, neither government nor private industry would even exist.

Water is still metered (and that makes a lot of sense in many ways matter for NL geography and geology)

Kris replied to Kris

@ScotInTraining @vladh

That said, yes, of course privatized water is a very bad idea (I have lived in Berlin, which privatized and then re-naturalized their water, because neocon shit)

A replied to Kris

@isotopp @vladh I moved from England to Scotland and the difference is night and day.

England genuinely thinks that they get a better service in terms of customer care. Down south there was a leak in the street for about a month before it was dealt with.

Here we had a leak and scottish water were here in 20 mins. In the Highlands. Its 15 mins one way to go and get a pint of milk. Can't fault them.

A replied to Kris

@isotopp @vladh I grew up in an area of the UK very like the Netherlands and you are right we need individualised approaches.

However we also need better international cooperation. Countries like Scotland that have ample ability for schemes like Ben Cruachan should be part of a network so that areas such as the Netherlands can use 'scottish" electricity at peak times.

Better resilience all round.

Global problems require global solutions

Kris replied to A

@ScotInTraining @vladh

"such as the Netherlands can use 'scottish" electricity at peak times."

app.electricitymaps.com/zone/N

Electricity maps is very nuclear centric, but the visualization is still useful.

The EU is one grid, and countries regularly export and import energy dynamically. That keeps power prices low across all of the EU.

Even GB is still part of that grid.

A

@isotopp @vladh I'm not sure batteries in the conventional sense are the answer.

Huge issues with mining the resources, lifespan and recycling.

However there are other options on a bigger scale. Ideas like Ben Cruachan near Oban is in essence a huge battery. Pump after uphill when there is surplus electricity and let it flow downhill when there is high demand. No nasty lithium and its water based so infinitely recyclable with a long lifespan.

Kris replied to A

@ScotInTraining @vladh

They totally are.

Around 5-10 kWh LFP per household that has solar, as a rough estimate the smaller of your daily usage after conversion to heat pumpt and electric car and the average solar yield in March or October.

If you allow grid charging for the battery, double the size to 20 kWh LFP.

zonneplan.nl/thuisbatterij

(And the geography that enables Oban does not scale, otherwise it would win)

A

@isotopp @vladh but I agree tax billionaires and flights should be taxed far more appropriately. And by that I mean stop subsidising and for each litre of fuel to be taxed higher than petrol.

Why not also make public transport free? Make it cheaper and easier than owning a car. We also need more public transport infrastructure. My nearest station is an hours drive and a trip to the city is 2-4 hours quicker by car than train.

Vlad

@isotopp Your experience here is really valuable, thank you. I guess what I’m looking for is CO2 from DC usage vs CO2 from consumer usage. Maybe I can figure this out with the data you provided.

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