Immersion-cooled compute
How it works
The mechanics behind the page you came from, with every figure measured or sourced.
78 kW off the grid in about four seconds.
When wind drops or demand spikes, the grid needs load it can shed fast. Conventional industrial demand response takes minutes. Ours takes seconds: across 17 logged events the site went from full load to 95% off in a mean of 4.4 seconds, and was back within 8 to 15 seconds. Nothing is damaged when it stops, and nothing is lost when it restarts.
Each compute unit sheds more than 99% of its load; at site level the reduction is 95 to 96%. Response figures were measured over four weeks of continuous, second-resolution instrumentation at our own facility.
Hot water at 60°C. No extra fuel.
Almost every watt our computers use leaves the site as heat, captured in a single fluid loop at 60°C: hot enough to heat a building and its hot water without a heat pump. From one site, that is up to about 680 MWh a year. Today it goes into the air. Sited at a pool, laundry, brewery, care home or greenhouse, it replaces gas.
The loop runs at 60°C flow and 40°C return. Sites with year-round demand are the best fit: swimming pools, laundries, breweries, care homes and greenhouses.
See where every kilowatt-hour goes, every second.
Our instrumentation records electrical and thermal performance once a second and meters heat calorimetrically, from measured flow, temperature difference and fluid-property-corrected constants. It shows exactly where energy goes, catches thermal problems early enough to act, and puts a number on recoverable heat. We are developing it into a product for battery formation, ageing and cell test, where the physics is the same.
Every logged event keeps its full one-second raw data, and the methodology is documented.
Iron-air storage.
Iron-air batteries store electricity by rusting iron and reversing it, using three of the most abundant materials on Earth, and are designed to discharge for around 100 hours. Innovate UK defines ultra long duration storage as at least 100 continuous hours of discharge with a working life of at least 25 years.
We are developing iron-air storage solutions for data centres and the grid: sites that absorb surplus renewable power, hold it for days, and release it when the wind drops, alongside compute that switches off in seconds and heat that gets used.
The site behind the numbers
Featherstone. A working facility, logged every second.
- 3 immersion tanks
- 24 compute units
- About 78 kW
- 60°C flow, 40°C return
- One-second logging
How the world figures are worked out, and what they are not.
Inputs are the latest published data centre electricity figures for each place, with the source shown. Heat: our site turns almost all of the electricity it uses into hot water at 60°C, so heat is taken as equal to electricity used. CO₂: if that heat displaced gas boilers, avoided emissions are estimated with the UK Government's 2025 conversion factor for natural gas, 0.183 kgCO₂e per kWh. Homes: Ofgem's typical household gas use of 9,500 kWh a year, a UK yardstick applied everywhere. Flexibility: average power (TWh divided by 8,760 hours) multiplied by the 95% of load our site sheds in a mean of 4.4 seconds. The 2030 figures apply the same model to the IEA's projection of about 950 TWh.
This is an illustration of scale, not a forecast: not every workload can be interrupted, heat needs a user within reach, and our ratios were measured on a 78 kW facility. The IEA now describes the aim of moving data centres from grid loads to grid resources, and its executive director has spoken of AI becoming an energy maker as well as an energy taker, citing flexible data centres among the solutions.
Questions and answers
How fast can the load respond?
Across 17 logged curtailment events, the mean response was 4.4 seconds, with full restoration in 8 to 15 seconds. Each unit sheds more than 99% of its load; at site level the reduction is 95 to 96%.
What can the heat be used for?
The cooling loop delivers hot water at 60°C, which can heat buildings and supply hot water without a heat pump. Sites with year-round demand are the best fit: swimming pools, laundries, breweries, care homes and greenhouses.
How big is the site?
Twenty-four compute units in three immersion tanks, about 78 kW of electrical load, at Featherstone. Up to about 680 MWh of heat a year at continuous operation, today rejected to air.
How do you know the numbers are right?
Electrical and thermal performance is recorded every second and time-synchronised. Heat is metered calorimetrically from measured coolant flow, differential temperature and fluid-property-corrected constants. Every logged event keeps its full one-second raw data, and the methodology is documented.
Who is behind Anait?
Anait Solutions Ltd is a UK company registered in England and Wales, company number 08085631.