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Data doesn't have to cost the earth

Green server

We are passionate about building a sustainable future

We are passionate about building a sustainable future, protecting the environment as well as enriching our wider community through the support of clients, those living locally and charitable foundations. Our efforts have been recognised as winners of the Green Data Centre accolade at the Datacentre Leaders Awards.

As a data centre built with environmental concerns at its core, we have designed our infrastructure and processes to minimise impact on our natural resources, optimising our efficiencies and achieving unprecedented levels of energy conservation within our industry, using five times less energy per kW of IT load than the average data centre. What's more, our PUE regularly drops below 1.2, meaning that for every 1kW used to power equipment hosted in the data centre, we use 0.2kW of power to operate all related areas of infrastructure, such as cooling, lighting, etc. These efficiencies not only allow us to benefit the world around us but to pass on savings to our clients.


Live Power Usage Effectiveness (PUE)

PUE is the ratio of how much energy is used by the facility and its infrastructure against the IT load. A Data Centre's PUE is calculated by: Total DC Energy Use / IT Equipment energy use = PUE. A PUE of 1.0 is perfect, but not feasible in the real world. The average PUE for most data centres is 2.0, which means that for every 1kW of IT load, they use another 1kW for cooling, electrical losses etc. The following graph is a live feed of our Kent Data Centre's PUE.

_ Tree Live PUE Graph Tree

We achieve this efficiency in a number of ways. For 100% of the year, the data centre utilises fresh air cooling, brought in from outside and filtered to clean room standards to eliminate contamination, passing into the data centre via a bank of multiple fans. In the event that British temperatures soar beyond a set threshold, the evaporative system comes online.

A reverse osmosis plant purifies water which the system then uses to produce a very fine mist. Within a large chamber, this moisture is used to raise the humidity of the slow moving air which passes through, decreasing its temperature. The evaporative system also acts as a room humidifier, and is supported by dual water mains, ensuring that it is resilient against mains failure. This approach is 2N resilient, with completely separate duplicate systems protecting against failure should one element be affected by outage or technical difficulty.

We can't get to a PUE of 1.0 because our dual path Tier 4 electrical infrastructure uses twice the number of Uninterruptable Power Supplies, running at less than half load (in case of failover). This means our electrical losses are higher than facilities with less resilient power layouts.


Our Building Utilises Methods of Reaching Our Environmental Potential

  • Following extensive research, Custodian operates an industry-leading fresh air cooling system and evaporative cooling system, built by our in-house teams.
  • Cold aisle containment system and rack blanking policy, further increasing efficiency levels
  • Our green SLA gives an upper temperature limit of 26 degrees, well within the operating tolerances of equipment manufacturers whilst allowing us to avoid wasting valuable energy to unnecessarily cool the data centre LED lighting systems
  • Recycled heat output saves 30% of building heating costs
  • Location allows cleaner air quality, increasing the lifecycle of filtration equipment
  • Favourable outside air temperatures