Efficiency Is The New Capacity
Cooling, power, and heat reuse engineering for data centres and semiconductor fabs where every megawatt has to count. Less energy, same availability.
The Numbers Behind The Megawatts
Energy has become the defining constraint on digital infrastructure, and the numbers explain why.
Sources: CSO Ireland, US Department of Energy, Government of Ireland, Cleanroom Technology
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 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 EM3 Helps
Three service pillars, each angled to the realities of critical facilities.
Energy Audits & Compliance
Facility energy audits built around availability constraints, plus EED Article 12 reporting readiness: scope, indicators, metering and the data pipeline behind them. You get a prioritised register of measures with the availability case made for each.
Design & Projects
Cooling plant upgrades, containment and EC fan retrofits, liquid cooling readiness and waste heat export schemes taken from feasibility to delivery. Engineered for live critical environments, staged hall by hall, with reversal paths agreed before anything changes.
Energy Management & Intelligence
Continuous performance monitoring against PUE, WUE and ERF targets, with sub-metered baselines and drift detection. EM3 captures 1.2 million datapoints a day across client sites and verifies savings to IPMVP, so the numbers survive scrutiny.
How The Work Gets Done
Every engagement follows the same engineering discipline, whatever the sector.
Audit
Instrumented, engineering-led, and baselined against your production data.
Roadmap
A costed, sequenced register of measures your board can fund in steps.
Delivery
Designed and delivered around production, never in spite of it.
Verify
Savings measured against the baseline and verified to IPMVP.
Proof Before Promises
Results from facilities where availability was never on the table.
17%reduction in annual cooling energyData centresHow a colocation campus cut cooling energy by 17% with availability untouched
A European colocation operator needed growth in a market where new grid connections are paused, so EM3 turned its cooling plant into…
3offtake routes costed and risk-assessedData centresTurning data centre waste heat into an investment-grade district export scheme
Facing planning and community expectations to do something useful with rejected heat, a leading European data centre operator asked EM3 to find…
Regulation As A Roadmap
The regulatory load on this sector is heavy and getting heavier. Treated properly, it is also a free engineering roadmap: every indicator you must report is a number we can improve.
EED Article 12 data centre reporting
Data centres with an installed IT power demand of at least 500 kW must report energy and sustainability indicators annually to a European database. EM3 builds the metering, baselines and data pipeline that make the submission routine.
Delegated Regulation 2024/1364
Defines the indicators behind Article 12, including PUE, WUE, ERF, REF, total energy, water consumption and waste heat utilisation. We turn each one into an engineering target with an owner and a trend.
ISO 50001
A certifiable energy management system that fits critical facilities well: significant energy users, EnPIs and a live opportunity register. EM3 implements ISO 50001 so it drives savings rather than paperwork.
CSRD
Corporate sustainability reporting needs site-level energy and carbon data that stands up to assurance. We deliver audit-grade numbers from sub-metered sources, not estimates.
Grid connection conditions
Connection agreements increasingly carry demand caps and flexibility expectations. We engineer the efficiency and demand management that lets you grow inside the connection you already have.
Water permits and WUE
Abstraction and discharge permits, plus WUE reporting, put water on the same footing as energy. We model the energy and water trade-off in every cooling decision so neither target is met at the other's expense.
Engineers Who Live In This Sector
Your first conversation is with our commercial team. Delivery is by engineers who spend their working lives in critical facilities and fabs.
Daniele Dominguez
Commercial Director
Senior Energy Engineer, Critical Cooling
Owns cooling plant, airflow and free cooling programmes from audit through to verified savings.
Energy Engineer, Cleanroom & UPW Systems
Owns fab-side HVAC, air change rate optimisation, CDA and ultrapure water measures.
Measurement & Verification Lead
Owns sub-metering design, IPMVP verification and the data pipeline behind EED reporting.
Go Deeper On The Detail
Case studies and reporting guidance for operators and fab engineers.
ReportData centre energy reporting: what the EED requires
The recast EU Energy Efficiency Directive has made data centre energy performance a matter of public record. This report explains…
ArticleAchieving energy efficiency: what EU Directive 2023/1791 means for manufacturing companies
Common questions from data center & semiconductor teams
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.
