How much does it cost to operate a data centre?
There is no single price, but electricity sets the floor. Each megawatt of IT load in a facility with a PUE of 1.5 uses about 13,140 MWh a year. At the EU average business electricity price of €0.18 per kWh, that is roughly €2.4 million a year before staff, maintenance, connectivity and hardware refresh.
Key takeaways
- Electricity is the largest running cost you can calculate up front: IT load (kW) × PUE × 8,760 hours × your price per kWh.
- Location changes the power bill by a factor of three or more. Eurostat's second-half 2025 business prices ranged from €0.07 per kWh in Finland to €0.26 in Ireland.
- Cooling and power losses are the overhead PUE measures. The IEA puts cooling at about 7% of electricity in efficient hyperscale sites and over 30% in less efficient enterprise ones.
- Staff is the cost most budgets underestimate. One seat covered around the clock needs about five people once holidays and sick leave are included.
- In the EU, sites with 500 kW or more of installed IT power must now report energy performance every year, which adds a compliance task.
- Compare against colocation and cloud on a full total cost of ownership basis, not on power or rent alone.
What goes into the cost to operate a data centre?
Operating cost (OpEx) is everything you pay each year to keep the facility and the equipment in it running. It is separate from the capital cost (CapEx) of land, building, electrical plant and cooling plant, although hardware refresh often sits somewhere in between.
The main operating cost lines are:
- Electricity for IT equipment, cooling, lighting and losses in UPS and power distribution.
- Staff for facilities, network, server and security operations, often 24/7.
- Maintenance contracts for UPS batteries, generators, chillers, CRAC units, fire suppression and access control.
- Hardware refresh and support for servers, storage and network gear, plus spare parts.
- Software licences for virtualisation, backup, monitoring and operating systems.
- Connectivity: carrier circuits, cross-connects, IP transit and DDoS protection.
- Insurance, security and compliance: physical guarding, audits (for example ISO/IEC 27001) and regulatory reporting.
- Property costs: rent or depreciation, property tax, water and waste.
Most of these lines depend on your contracts and staffing model, so only you can price them. Electricity is different: you can estimate it with one formula and public price data.
How much electricity does a data centre use?
Annual energy is IT load × PUE × 8,760 hours. A facility running 1 MW of IT equipment at a PUE of 1.5 draws 1.5 MW from the grid, which is 13,140 MWh a year.
Power Usage Effectiveness (PUE) is total facility energy divided by IT equipment energy. A PUE of 1.0 would mean every kilowatt-hour goes to servers, storage and network. Everything above 1.0 is cooling, power conversion losses, lighting and other building loads. Uptime Institute's Global Data Center Survey 2025 reports that the weighted industry average still hovers just above 1.5 and has barely moved for six years.
The International Energy Agency's Energy and AI report gives a useful split. Servers account for around 60% of electricity demand in modern data centres. Cooling ranges from about 7% in efficient hyperscale facilities to more than 30% in less efficient enterprise sites. The same report estimates that data centres used around 415 TWh in 2024, about 1.5% of global electricity.
Worked example: the annual power bill per megawatt
The table uses Eurostat's electricity price statistics for non-household consumers in the second half of 2025. These prices are for the 500–2,000 MWh consumption band and exclude refundable taxes such as VAT. Large sites often negotiate lower prices or sign power purchase agreements, so treat these as a starting point.
| Scenario | IT load | PUE | Energy per year | At €0.0748/kWh (Finland) | At €0.1837/kWh (EU average) | At €0.2552/kWh (Ireland) |
|---|---|---|---|---|---|---|
| Small on-site server room | 100 kW | 1.8 | 1,577 MWh | €118,000 | €290,000 | €402,000 |
| Enterprise data hall | 1 MW | 1.8 | 15,768 MWh | €1.18 million | €2.90 million | €4.02 million |
| Efficient enterprise or colocation site | 1 MW | 1.5 | 13,140 MWh | €0.98 million | €2.41 million | €3.35 million |
Two things stand out. First, location matters more than almost any engineering choice: the same 1 MW site costs over three times as much to power in Ireland as in Finland. Second, efficiency pays. Cutting PUE from 1.8 to 1.5 on 1 MW of IT load saves 2,628 MWh a year, which is about €480,000 at the EU average price.
The PUE values in the table are assumptions for illustration. Measure your own: read the facility meter and the UPS output meter over a full year, because cooling load changes with the seasons.
What do staff, maintenance and hardware add?
After electricity, people and equipment upkeep are the biggest lines. They vary too much between organisations for a credible industry average, so build them bottom-up.
Staffing for 24/7 operations
A week has 168 hours. One full-time employee covers about 40 of them, and less once holidays, training and sick leave are counted. That is why one seat staffed around the clock needs roughly five people. If you need an on-site facilities technician and a remote operations engineer at all hours, budget for about ten salaries before you add network, security and management roles.
Many organisations keep a small day team on site and buy out-of-hours monitoring and incident response from a partner. Our page on remote infrastructure monitoring explains how that split usually works.
Maintenance and refresh
- Power plant: UPS service, battery replacement on the manufacturer's schedule, generator servicing, fuel and regular load tests.
- Cooling plant: chiller and CRAC servicing, filter changes, refrigerant checks and water treatment where you use evaporative cooling.
- Life-safety systems: fire detection and suppression inspections, which are often a legal requirement.
- IT hardware: vendor support contracts and a refresh budget. Spread each purchase over the years you will really keep it, and include disposal and data-wipe costs.
Licences and connectivity
Software can rival hardware in cost. Virtualisation licensing in particular has changed for many VMware customers since Broadcom moved them to subscription bundles, so re-check renewal quotes rather than carrying last year's figure forward. Connectivity costs include at least two diverse carrier circuits if you want to survive a fibre cut, plus cross-connect fees in colocation.
How do redundancy and tier level change the cost?
More redundancy means more equipment to buy, power and maintain. A design with N+1 or 2N UPS and cooling has spare capacity running at partial load, which raises both maintenance cost and PUE.
The Uptime Institute Tier Standard classifies facilities from Tier I (basic capacity) to Tier IV (fault tolerant). Higher tiers need concurrently maintainable or fault-tolerant power and cooling paths. Match the tier to the business impact of downtime for each workload. Running a test environment in Tier IV space is money spent on resilience nobody needs.
What compliance costs apply in the EU?
The recast Energy Efficiency Directive (EU) 2023/1791 requires owners and operators of data centres with an installed IT power demand of at least 500 kW to report energy performance to an EU database every year. The Swedish Energy Agency explains how Sweden applies this through Act 2025:570, with the first report covering 2025 due by 15 May 2026. Plan for metering, data collection and someone to own the submission.
Security regulation adds further work. Under NIS2, data centre service providers are among the regulated digital infrastructure entities, so risk management, incident reporting and supply-chain controls also become running costs. Our NIS2 compliance guide covers what that involves.
Is it cheaper to run your own data centre, use colocation or move to the cloud?
It depends on utilisation and how much of the stack you want to own. A full total cost of ownership comparison is the only fair test.
| Model | What you pay for | Usually fits when | Watch out for |
|---|---|---|---|
| Own facility | Building, power and cooling plant, all staff, hardware, licences | Large, stable, high-utilisation workloads, or strict data location rules you cannot meet otherwise | Idle capacity built for peak demand, long lead times for expansion, specialist facilities staff |
| Colocation | Rack or cage space, metered or committed power, cross-connects; you own the hardware | You want control of hardware without running a building | Power commitments you pay for even when unused, remote-hands fees |
| Public cloud (IaaS/PaaS) | Per-hour or per-second compute, storage and data transfer | Variable or seasonal demand, fast-growing products, teams that want managed services | Data transfer charges, unmanaged sprawl, licences that cost more in the cloud |
To compare like with like, list every line from the operating cost list above for your current estate. Then model the same workloads in the target. AWS offers Migration Evaluator to build a business case from measured on-premises utilisation, which avoids sizing the cloud for the peak your hardware was bought for.
A real example: Branäsgruppen, which runs one of Sweden's largest ski resort groups, used to scale a VMware ESXi estate by hand ahead of each winter season. After Opsio migrated it to AWS with auto-scaling and multi-AZ databases, the group reported a 40% reduction in total cost of ownership, 40% faster average page response and 99.9%+ application uptime. The Branäsgruppen case study describes the architecture and the FinOps work behind the saving.
How to reduce data centre operating costs
- Measure PUE monthly. You cannot manage a number you only estimate once a year.
- Raise supply air temperatures within your hardware vendors' supported range and use hot or cold aisle containment.
- Consolidate. Virtualise or retire under-used servers. Every idle server pays for power, cooling and a support contract.
- Right-size redundancy by workload instead of building every room to the strictest tier.
- Renegotiate power and review whether your site is in the right price zone for its size.
- Move variable workloads out. Seasonal or bursty systems are usually cheaper in the cloud, where you stop paying when demand drops. See our cloud cost optimisation services for how to keep that bill under control after the move.
How Opsio helps
Opsio is an AWS Advanced Tier Services Partner with the AWS Migration Competency, with offices in Karlstad, Sweden and Bangalore, India. We help IT teams baseline what their data centre really costs, build the business case for staying, moving to colocation or migrating to the cloud, and then run the result. See our AWS migration service and FinOps practice.
Frequently asked questions
How much does it cost to run a small server room per year?
Start with power. A 100 kW server room at a PUE of 1.8 uses about 1,577 MWh a year, which costs about €290,000 at the EU average business price of €0.18 per kWh. Add staff, maintenance contracts, licences, connectivity and hardware refresh, which together are often larger than the power bill.
What share of data centre operating cost is electricity?
It varies with your electricity price, staffing model and hardware strategy, so there is no reliable universal percentage. In low-price regions staff and hardware can outweigh power. In high-price regions such as Ireland, electricity is often the largest single line. Calculate it with IT load × PUE × 8,760 hours × price.
What is PUE and why does it affect cost?
Power Usage Effectiveness is total facility energy divided by IT equipment energy. Every point above 1.0 is energy you pay for that does no computing, mostly cooling and power losses. On 1 MW of IT load, moving from 1.8 to 1.5 saves about 2,628 MWh a year.
Is it cheaper to run your own data centre or use the cloud?
Own facilities can be cheaper for large, stable workloads at high utilisation. The cloud is usually cheaper for variable, seasonal or fast-growing workloads, because you do not pay for idle peak capacity. Compare both on a full total cost of ownership basis using measured utilisation.
Do EU data centres have to report their energy use?
Yes, if the installed IT power demand is at least 500 kW. The Energy Efficiency Directive requires annual reporting of energy performance to an EU database. In Sweden the first report, covering 2025, was due by 15 May 2026.
For hands-on delivery in India, see Opsio data center services provider.
Related reading
About the Author
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