Web Wiz - Solar Powered Eco Web Hosting


Data Centre Power Usage Effectiveness



Environmental Ethics are at the core of our business, and one of the primary design aims of our Eco Data Centre was to make it as energy-efficient as possible.

To calculate the efficiency of a Data Centre, to help identify areas where improvements can be made, The Green Energy Grid came up with the Power Usage Effectiveness (PUE) metric.

PUE is the ratio of Total Facility Power Consumption to the amount of power consumed by the IT Equipment.

PUE = Total Facility Power / IT Equipment Power

The Total Facility Power Consumption includes everything within the Facility including Data Centre Cooling, Lighting and other power overheads.

The IT Equipment Power Consumption should only include the power that is used by the IT Equipment within the Data Centre. It should be taken as close to the IT Equipment as possible so that losses in cabling do not create inaccuracies in the PUE calculation.

Once you know the Total Facility Power, you divide this by the power used by the IT Equipment. In a perfect world, you would end up with a PUE of 1.0 where the IT Equipment uses all the power, but you will always get losses. The most significant energy loss being cooling of IT Equipment.

According to the US Environmental Protection Agency, most Data Centres have a PUE of 2.0 to 3.0.

Web Wiz Eco Data Centre PUE

To calculate our Data Centre PUE, you would typically record power usage at the Utility Power Meter as it enters the Facility. As we generate our own renewable energy on-site, this would not represent our actual power usage. 

For the Total Facility Power, we measure the power usage at the Facilities Power Distribution Board that distributes power within our Facility.

For IT Equipment Power, we measure the power usage at the Sub Power Distribution Board within the Data Hall that distributes power to the Data Centre IT Equipment Racks.

Power usage changes depending on the season as Summer temperatures require more cooling of IT Equipment. We can use the PUE metric taken regularly at different times of the year to identify areas where we can make improvements in efficiency.

Below you can see PUE results for our Eco Data Centre during various periods, that we hope to improve on over time;

August 2018 - PUE 1.41
November 2018 - PUE 1.16
August 2019 - PUE 1.21
January 2020 - PUE 1.09



Become a Fan on Facebook Follow us on Twitter Connect with us on LinkedIn Community Forums Web Wiz Blogs Web Wiz News
About Web Wiz | Contact Web Wiz | Terms & Conditions | Cookies | Privacy Policy

Web Wiz is the trading name of Web Wiz Ltd. Company registration No. 05977755. Registered in England and Wales.
Registered office: Web Wiz Ltd, Unit 18, The Glenmore Centre, Fancy Road, Poole, Dorset, BH12 4FB, UK.

Prices exclude VAT unless otherwise stated. VAT No. GB988999105 - $, € prices shown as a guideline only.

Copyright ©2001-2021 Web Wiz Ltd. All rights reserved.