Visualization of a Kelvin Flexbox: a forest-green 40 ft ISO container with a copper K on the double doors, horizontal louvers and a keypad, on gravel among pines. Not a photograph of an operating site.

Thermodynamic Compute

Turning waste Energy into High-Performance Compute

Hybrid, modular data centres. Compute that can flex.

Email Kelvin What is Flexbox?

Visualization Kelvin Flexbox

The gap

Surplus Energy is switched off. Interruptible Compute sits on it.

A quarter of Europe’s wasted Energy is trapped in northern Sweden. Every TWh of it is inventory.

Energy without a buyer

Northern Europe builds Energy faster than demand can take it.

Compute without a place

AI training and batch inference sit behind multi-year queues.

Sweden’s north is spilling cheap power; the south imports expensive.

Kelvin sits interruptible Compute on that surplus.

Approach

Power in. Compute & Heat out.

Surplus Energy in. Interruptible Compute and Thermal/Heat out.

Hosts cannot pause; Compute flexes.

Visualization of a Kelvin Flexbox: a forest-green 40 ft ISO container with a copper K on the double doors, horizontal louvers and a keypad, on gravel among pines. Not a photograph of an operating site. Visualization of a Kelvin Flexbox exploded: 4 racks and cooling pulled from a forest-green 40 ft ISO. Not a photograph of an operating site. Visualization of an insulated Heat pipe from a Kelvin Flexbox toward nearby buildings. Siting visualization. Not a live sink. Not a photograph of an operating site.

Visualization Kelvin Flexbox

  • 01

    Power in

    Curtailed wind and solar, hydro in negative-price hours, spare industrial connection. Behind the meter.

  • 02

    Compute

    AI and HPC that can checkpoint. A 40 ft ISO at the source. ≈1 MW.

  • 03

    Heat out

    Heat as an asset, not a side effect — local on site, and municipal or district where a network exists.

The loop

Energy in. Compute, Flexibility & Thermal/Heat out.

The load sits at the surplus.

Energy in

  • Curtailment — wind and solar switched off
  • Hydro surplus — negative-price hours
  • Spare industrial — connection already there

Kelvin Flexbox

  • Full stack at the surplus.
  • Compute, Flexibility and Thermal/Heat on the same pad.
  • 40 ft ISO. ≈1 MW. Air or liquid.

Value out

  • Compute — AI training, batch inference, HPC
  • Thermal/Heat — local on site, municipal or district
  • Flexibility — FCR-D, aFRR and mFRR. Primary Nordic energy markets.

  1. 01

    Site at the source

    Sit the load where the surplus already is — behind the meter or spare industrial.

  2. 02

    Flex the load

    Compute pauses so the host stays on.

  3. 03

    Flexibility

    FCR-D, aFRR and mFRR. Primary Nordic energy markets.

  4. 04

    Close the loop

    Every kilowatt of Compute leaves as Heat. Capture is designed in.

Why Kelvin

Three products. One megawatt.

Compute, Flexibility-as-a-Service, Thermal/Heat.

  1. 01

    Compute

    Interruptible Compute on surplus Energy. The baseline.

  2. 02

    Flexibility-as-a-Service

    Compute flexes instead of the host. The load is built to move — FCR-D, aFRR and mFRR.

  3. 03

    Thermal/Heat

    Capture designed in. Local on site, municipal or district where a network exists.

The system

What is Flexbox?

Four parts on one pad.

  1. 01 FB-40 Flexbox One module. 40 ft ISO. ≈1 MW. Air or liquid.
  2. 02 CTL Controller + meters Pre-tested with the Flexbox. Dispatch <0.7 s.
  3. 03 HEAT Heat flange Capture designed in. Local on site, and municipal or district where a network exists.
  4. 04 LV · MV Connection Behind the meter or grid-connected. Kelvin brings the unit.

See the unit

How we start

Two tracks — email is the conversation.

Kelvin Flexbox

One 40 ft ISO.

Unit view

Visualization of a Kelvin Flexbox close-up: forest-green double doors with a copper K and keypad, and a bank of horizontal louvers. Not a photograph of an operating unit.
VisualizationKelvin Flexbox — door, louvers, Heat-out

On the pad

What others assemble on-site piece by piece ships as one module. Pre-tested.

Kelvin brings Compute, Flexibility, Thermal/Heat — software, hardware, infrastructure — at the surplus pocket. Checkpoint in the contract.

How the megawatt pays

  1. Compute

    The baseline whenever the unit is running.

  2. Stand-by

    Paid for availability.

  3. Activation

    Paid when the load moves. No cycle penalty.

  4. Thermal/Heat

    Where a sink exists — local on site, and municipal or district where a network exists.

Kelvin runs the Compute; the host keeps core operations. Compute earns while it flexes. At generation. At the mill. Compute vs batteries.

Scale

Visualization of a Kelvin Flexbox: a forest-green 40 ft ISO container with a copper K on the double doors. Not a photograph of an operating site. Visualization of two Kelvin Flexbox units stacked at dusk. Not a photograph of an operating site. Visualization of timber-and-glass data halls in a Nordic forest clearing. Siting study, not the product SKU. Not a photograph of an operating site.
VisualizationKelvin Flexbox, 40 ft ISO

A valid first step — one module on the pad.

Hosts

01 / 07

01 Industrial

Visualization of a Heat pipe into an unbranded timber mill or drying hall. Site-specific — not a named mill. Not a photograph of an operating site. Visualization of an insulated Heat pipe from a Kelvin Flexbox toward nearby buildings. District Heat offtake — not home Compute. Not a photograph of an operating site. Visualization of timber-and-glass data halls in a Nordic forest clearing. Siting visualization, not the product SKU. Not a photograph of an operating site. Visualization of timber-and-glass data halls in a Nordic forest clearing. Siting visualization, not the product SKU. Not a photograph of an operating site. Visualization of a timber-and-glass hall at the foot of wind turbines in a Nordic clearing. Siting visualization, not the product SKU. Not a photograph of an operating site. Visualization of a timber-and-glass hall at the foot of wind turbines in a Nordic clearing. Siting visualization, not the product SKU. Not a photograph of an operating site. Visualization of a Heat pipe into an unbranded timber mill or drying hall. Site-specific — not a named mill. Not a photograph of an operating site.
VisualizationIndustrial host — load at the mill

Local Heat at the mill — premises and process on site. The mill stays on; Compute flexes.

Flexbox, campus, battery

Kelvin Flexbox compared with hyperscale campus and battery storage.
Criterion Flexbox Campus Battery
First step One 40 ft ISO is valid Queue + shell + hall Idle between calls.
Power ≈1 MW · ×2 ≈2 MW MW on request — no catalogue figure Stores Energy. Does not compute.
Thermal/Heat Designed in Usually dumped None
Dispatch <0.7 s · no cycle degradation Always-on colo Cycle degradation. Idle between calls.

Compute earns while it flexes. Compute vs batteries.

Email is the conversation

Location, connection, hours.

Email Kelvin

Next: Who we build with · First plots

Who we build with

Energy and hosts first. Then AI, HPC and cloud that can checkpoint. Flexibility in the contract.

Hosts

Workloads

01 / 07

Visualization of a timber-framed hall interior: two aisles of liquid-cooled racks under wood beams. Siting visualization. Not a photograph of an operating site.

VisualizationTimber interior — mill that stays on.

Industrial loads

1.0

You stay on. Compute flexes.

Sawmills, pulp, drying. Local Heat on site — process and premises. The mill cannot pause — Compute flexes instead.

Energy

Visualization of an insulated Heat pipe from a Kelvin Flexbox toward nearby buildings. District Heat offtake — not home Compute. Not a photograph of an operating site.

VisualizationHeat into the network that already serves buildings and homes.

Residential

2.0

District Heat, not home Compute

Heat into the district network that already serves buildings and homes. A Flexbox can feed that pipe.

Visualization of timber-and-glass data halls in a Nordic forest clearing. Siting visualization, not the product SKU. Not a photograph of an operating site.

VisualizationTimber halls at generation.

Hydro

3.0

Fully renewable. Made reliable.

Hydro at generation, behind the meter or spare connection. Compute absorbs the spill; the host keeps generating.

Energy

Visualization of timber-and-glass data halls in a Nordic forest clearing. Siting visualization, not the product SKU. Not a photograph of an operating site.

VisualizationTimber halls. Heat sink next to the pad.

Geothermal

4.0

Generation beside a Heat sink.

Compute behind the meter. Heat designed in.

Thermal

Visualization of a timber-and-glass hall at the foot of wind turbines in a Nordic clearing. Siting visualization, not the product SKU. Not a photograph of an operating site.

VisualizationTimber hall at generation. Dispatchable adjacency.

Gas

5.0

Dispatchable adjacency

An industrial host with dispatchable adjacency.

Visualization of a timber-and-glass hall at the foot of wind turbines in a Nordic clearing. Siting visualization, not the product SKU. Not a photograph of an operating site.

VisualizationTimber hall at wind. Surplus at generation.

Solar & wind

6.0

Solar and wind, made reliable

Fully renewable generation. Compute behind the meter absorbs surplus so the Energy is used, not switched off.

Energy

Visualization of a Heat pipe into an unbranded timber mill or drying hall. Site-specific — not a named mill. Not a photograph of an operating site.

VisualizationProcess Heat on an industrial pad.

Manufacturing / process

7.0

Process Heat, sized to the line

Drying, kilns, process. The flange is sized to the line you already run.

Thermal

Visualization of a Kelvin Flexbox: a forest-green 40 ft ISO container with a copper K on the double doors, on gravel among pines. Interruptible training and batch inference. Not a photograph of an operating site.

VisualizationKelvin Flexbox — interruptible training and batch inference.

AI

1.0

Training and batch inference

Work that can wait. Checkpoint in the contract.

Compute

Visualization of a timber-framed hall interior: two aisles of liquid-cooled racks under wood beams. Siting visualization for simulation and rendering that can wait. Not a photograph of an operating site.

VisualizationRacks for simulation and rendering that can wait.

HPC

2.0

Simulation and rendering

Jobs that can wait. The load moves when the grid calls.

Visualization of three timber-and-glass data halls in a Nordic forest clearing at dusk, with solar panels in front and wind turbines behind. Siting visualization, not the product SKU.

VisualizationTimber halls at dusk. Burst and batch that can pause.

Cloud

3.0

Interruptible batch, not colo

Capacity is on request. Work that can wait.

Visualization of a Compute hall on a fenced pad inside a wind park, at the foot of a turbine. Module at the source, behind the meter. Siting visualization. Not a photograph of an operating site.

VisualizationModule at the source, behind the meter.

Edge

4.0

The module at the source

Behind the meter, at generation. A 40 ft Flexbox at the source.

Visualization of a Kelvin Flexbox on gravel among pines. A workload that can pause — not a mining SKU. Not a photograph of an operating site.

VisualizationKelvin Flexbox — a workload that can pause.

Bitcoin

5.0

A workload that can pause

Public products remain Compute, Flexibility-as-a-Service, and Thermal/Heat.

Compute, Flexibility and Thermal/Heat. Compute · Flexibility · Energy · Thermal

You bring the pocket. Kelvin brings the stack.

You bring

  • Location
  • Surplus hours
  • Connection — behind the meter or spare industrial
  • Heat sink if any

Kelvin brings

  • Flexbox
  • Hardware, software, infrastructure
  • Compute
  • Flexibility
  • Thermal/Heat, ops

Compute

Compute on surplus

Interruptible HPC. Checkpoint in the contract.

See Compute

Why it holds

No single price, market or machine decides the outcome.

  1. 01

    Compute

    The connection earns Compute between dispatches — interruptible AI training, batch inference, simulation and rendering. Checkpoint is in the contract, so the job pauses and comes back.

    Income a battery cannot print. Kelvin runs the Compute.

  2. 02

    Energy

    The site is the moat. Sit behind the meter at hydro, geothermal, solar or wind — or on spare industrial electrical already on the plot.

    Locked-in surplus cannot be copied without that Energy. Extra grid load stays low.

  3. 03

    Thermal

    Thermal/Heat is a product, not CSR. Capture is designed into the Flexbox: local process and premises on site, district Heat where a network exists.

    Residential is district Heat only — not a box in a house.

  4. 04

    Curtailment

    Clean Energy is switched off because the load cannot move. We sit on that surplus.

    A module at generation.

  5. 05

    Congestion

    Northern surplus, southern demand. Wires are a multi-year build. A 40 ft module sits at the Energy instead of queueing for a wire.

    The connection is the asset.

  6. 06

    Mitigation

    Batteries store Energy, sit idle, cycle-degrade and earn one stream. Compute earns while it flexes — and heats while it earns.

    No cycle penalty. Dual revenue on the same connection.

  7. 07

    Cadence

    Pad, connection and permits. Weeks, not a multi-year queue.

    Weeks against years. Cadence, not an SLA.

  8. 08

    Nine lines

    Compute plus grid services, Thermal/Heat and mitigation run together. Modular. Surplus Energy. Low grid-load. Turn-key.

    Nine revenue lines against one.

Containerised Flexbox units do not need the major grid reinforcements a hyperscale urban build does. A siting choice. Extra grid load stays low.

Sites

First plots

Three plots in Hälsingland. Load at surplus. Status Plot.

  1. 01

    Sit at surplus

    Surplus Energy at the source. Extra grid load stays low.

  2. 02

    Heat where it is needed

    Beside local and municipal or district Heat.

  3. 03

    Retrofit, not greenfield

    Industrial halls — two previously data-centre halls. Re-tenanting.

Unlabelled visualization of a Hälsingland map. Pins mark Kelvin’s first plots: K1 Söderhamn on the coast, K2 Bollnäs inland, and K3 Ljusdal further northwest. Not a live operations map.
Visualization First plots.

Stockholm is postal c/o only. First plots stay Plot.

How we start

Two tracks

Energy host or Compute buyer. Email the facts — Kelvin handles the stack.

Energy host

You have surplus

  1. Location, connection, hours, Heat if any.
  2. We map the loop.
  3. We write back. A short note is enough.

Email Kelvin

Compute buyer

You have AI or HPC that can wait

  1. Say what has to run — training, batch inference, simulation — and what can wait.
  2. We map surplus and Flexibility-as-a-Service.
  3. We write back. A short note is enough.

Email Kelvin

Questions

Straight answers. Email for the rest.

Who maintains the unit?

Kelvin runs the Compute — the unit and the cooling. You remain the Energy host: site access, the connection, and the Heat sink where you have one.

How is Flexibility-as-a-Service paid?

Flexibility-as-a-Service — paid on stand-by, paid on activation and paid while Compute is running. See How the megawatt pays. Flexibility.

Retrofit or plug-and-play?

Low-demand retrofit, high-demand plug-and-play.

What happens when Compute pauses?

The load is built to ramp. When the grid is tight or the surplus disappears, jobs checkpoint and the site steps down. Heat follows the load — a paused unit is not a baseload boiler.

Who takes the Heat?

Thermal/Heat is a product. Capture is designed in. Local on site, and a pipe into a municipal or district network where one exists. We size the flange together. We do not take over your network.

Why Sweden and the Nordics?

The north spills cheap power; the south imports expensive. Kelvin sits the load at that surplus. Energy.

Do we need a new grid connection?

No. Behind the meter, at the surplus. Energy.

Does this only work as a full campus?

No. One Flexbox is a valid first step — ≈1 MW / 40 ft. Scale.

Who supplies the hardware?

Kelvin. The host brings the pocket — location, surplus, connection. Kelvin supplies the stack — hardware, software, infrastructure — at the surplus.

Can the host just pause?

Industrial and residential loads cannot pause or curtail on demand. Compute flexes instead. Every large load needs this. Almost none of them can build it. Flexibility.

Is this instead of batteries?

Batteries store Energy. Compute earns while it flexes. It wins on cost, wear, duration, recovery, hazard and revenue. Compute vs batteries.

What is Flexibility-as-a-Service?

Flexibility-as-a-Service — paid on stand-by, paid on activation and paid while Compute is running. The host stays on. Flexibility.

How fast does the load move?

Frequency needs a response in milliseconds, not minutes. Flexbox is built to move in <0.7 s.

Is Bitcoin a product?

A load that can pause. Bitcoin.