Energy has become the defining constraint on digital infrastructure, and the numbers explain why.
The challenges
The Challenges Operators Actually Face
Six pressures define energy work in this sector, and every one of them collides with the uptime culture.
PUE pressure with zero appetite for risk
Boards want a better PUE every year, but nobody wants to own the risk of touching a setpoint that has kept the site stable since commissioning. The result is a facility that is reliable, conservative, and quietly wasteful. Progress needs monitoring evidence strong enough to make change boring.
Grid capacity is capping growth
New connections in Dublin and the greater Dublin area are paused until 2028, and similar constraints are spreading across European hubs. When you cannot buy another megawatt from the grid, the only megawatts left are the ones your mechanical and electrical plant is wasting.
Waste heat reuse is now expected
Regulators, planners and host communities increasingly expect data centres to do something useful with the heat they reject. EED reporting now asks about waste heat utilisation explicitly. Sites that have never mapped their heat have no answer ready.
Cleanroom and ultrapure water intensity
Semiconductor fabs carry some of the most intensive loads in industry: high-grade cleanrooms can consume up to 50 times the energy of non-classified areas, and SEMI guidance assigns 9 kWh per cubic metre to cold ultrapure water and 92 kWh per cubic metre to hot. Small percentage savings are large absolute numbers.
A 24/7 culture that blocks optimisation
There is never a convenient window to trial a change in a facility that can never be down. Optimisation stalls not because the engineering is hard but because the change management is. Hall-by-hall staging with agreed reversal paths is how the deadlock breaks.
Water use is under scrutiny
Evaporative and adiabatic cooling trade water for energy, and both abstraction permits and WUE reporting are tightening. Cooling decisions now have to be made against energy and water targets at the same time, not one after the other.
What we engineer
What We Engineer In Your Facility
The energy opportunity in this sector is concentrated in mechanical and electrical plant, not IT load. This is where we work.
Cooling plant and free cooling
We optimise chilled water setpoints, condenser water control and chiller staging, and extend the free cooling hours that the Irish and northern European climate hands you for nothing.
Airflow management and containment
We complete hot and cold aisle containment, fit blanking panels and seal floor grommets, then cut fan energy hard because fan power falls with roughly the cube of airflow.
CRAC and CRAH fan systems
We retrofit fixed-speed units with EC fans on demand-based variable speed control, matched to the contained airflow the halls actually need.
Liquid cooling readiness
We assess direct-to-chip and rear-door heat exchanger options for racks above 30 kW, and engineer the higher return water temperatures that improve chiller efficiency and make heat export viable.
Waste heat recovery and export
We map rejected heat at source, appraise offtake options and build costed schemes that turn the energy reuse factor from a reporting line into a carbon and revenue case.
Power distribution and UPS efficiency
We quantify UPS and distribution losses, optimise transformer and UPS loading, and close the gap between metered IT load and what the utility meter says.
Semiconductor cleanroom HVAC
We optimise make-up and recirculation air handlers, fan filter units and air change rates against measured particle loads, with continuous monitoring so cleanliness class is never in question.
Ultrapure water and CDA systems
We improve UPW reclaim and recycle rates, optimise point-of-use heating, and run compressed dry air leak surveys and pressure optimisation that typically recover 10 to 20% of compressed air energy.
How we engage
How The Work Gets Done
Every engagement follows the same engineering discipline, whatever the sector.
01
Discover
Audits, assessments and baseline development that establish what actually drives your energy cost and carbon.
02
Design
Feasibility, concept design, modelling and the business case that turns an opportunity into a fundable project.
03
Deliver
Tendering, procurement, engineering design, delivery and commissioning, around production rather than in spite of it.
04
Manage
Continuous improvement and verified performance, so the gains are still there years later.
Can efficiency work proceed without availability risk?
Yes, if it is staged properly. We sub-meter first so every change is verified against a baseline, move setpoints in monitored steps inside the ASHRAE allowable envelope, and agree a reversal path for every measure before it goes in. Work proceeds hall by hall, never site-wide in one move, and nothing becomes permanent until the monitoring data says it is safe. That discipline is what keeps energy work and availability on the same side.
What does the EED require us to report?
Under Article 12 of the recast Energy Efficiency Directive and Delegated Regulation 2024/1364, data centres with an installed IT power demand of at least 500 kW must report energy and sustainability indicators annually to a European database, with submissions due by 15 May. The indicators include total energy consumption, PUE, WUE, ERF, REF, water consumption and waste heat utilisation. Most operators find the hard part is not the form but the metering behind it.
Is waste heat export realistic for our site?
It depends on three things: the grade of your heat, the distance to a credible offtaker, and the demand profile at the other end. Air-cooled plant rejects low-grade heat that usually needs a heat pump lift; liquid cooling raises return water temperatures and improves the case sharply. Start with heat mapping. It is quick, it quantifies what you actually have, and it tells you early whether a full feasibility study is worth commissioning.
Get started
Make Every Megawatt Count
If the grid will not give you more capacity, your plant will. Talk to engineers who cut cooling, power and water without ever touching availability.
Decarbonisation Strategy
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