Generational Typology of Data Centres

As a systems thinker, I've seen a lot conversation about data centres that we currently use and what's being proposed, the issue is that we just label all centres as being the same. 

This is actually because of a story that was aired on the ABC about a new data centre being proposed 2hrs north of Adelaide, South Australia and how it misrepresented some facts about the typology of systems. 

So I thought, why not classify these into generations, because theirs some really good ones planned and some really bad ones that should be fixed. I would class the one in Bundee (Goyder Regional Council) as being one of the best case versions if their's goes ahead. 

A clear, engineering‑accurate classification from 1990s → 2030s.

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Gen‑1: Industrial Air‑Cooled Boxes (1995–2010)

Typology: Warehouse‑scale, monolithic, inefficient.  

Cooling:  

- Air‑cooled CRAC units  

- Evaporative cooling common in dry climates  

- Very high water use  

Power:  

- 0.8–1.5 PUE  

- Grid‑dependent  

Characteristics:  

- Loud, hot, power‑hungry  

- No heat reuse  

- No renewable integration  

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Gen‑2: Hyperscale Cloud Era (2010–2020)

Typology: Purpose‑built hyperscale campuses (AWS, Google, Azure).  

Cooling:  

- Evaporative cooling still common  

- Some closed‑loop chillers  

- Water use varies massively by region  

Power:  

- 1.2–1.4 PUE  

- Renewable PPAs begin  

Characteristics:  

- Modular design  

- Global redundancy  

- Still large water footprints in hot regions  

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Gen‑3: High‑Density Compute / AI‑Ready (2020–2025)

Typology: GPU‑dense, high‑thermal‑load facilities.  

Cooling:  

- Closed‑loop liquid cooling becomes standard  

- Rear‑door heat exchangers  

- Immersion cooling pilots  

- Water use drops dramatically  

Power:  

- 1.1–1.2 PUE  

- On‑site renewables + grid  

Characteristics:  

- Designed for AI clusters  

- Heat reuse begins (district heating in EU)  

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Gen‑4: Liquid‑Loop / Immersion‑Dominant (2025–2032)

Typology: The era we’re entering now — including Bundey SA.  

Cooling:  

- Closed‑loop liquid cooling as default  

- Two‑phase immersion cooling  

- Minimal water use (initial fill + tiny top‑ups)  

- Heat reuse becomes economically valuable  

Power:  

- 1.05–1.15 PUE  

- Co‑located with renewable energy zones  

- Grid‑interactive load shaping  

Characteristics:  

- High‑density AI racks  

- Water footprint 90–99% lower than Gen‑1/2  

- Can operate in arid regions  

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Gen‑5: Thermal‑Recycling Compute Ecosystems (2030+)

Typology: Compute integrated with industrial ecology.  

Cooling:  

- Full heat‑recovery loops  

- Zero‑evaporation systems  

- Phase‑change cooling  

Power:  

- <1.05 PUE  

- On‑site generation + storage  

Characteristics:  

- Heat used for greenhouses, industry, district heating  

- Water use effectively zero  

- Compute becomes part of local energy systems