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School carbon emissions on the rise
Typical CO2 emissions from schools in England are rising, despite reductions to their heating demands, because of an increase in electricity consumption, according to new research.

The study also suggests that the new academies, schools funded directly by the state and heavily supported by the present Government, have significantly higher energy consumption profiles than normal secondary schools.

Researchers drew primarily on a database of Display Energy Certificates (DECs), which are required under UK legislation, (stemming from EU directives on building energy). These have applied to all public buildings over 1,000m since 2008, and show the buildings annual energy performance.

The researchers, from the University of Cambridge and Shinawatra University, Thailand, were able to obtain records for around 25,000 DECs produced in 2008-9, following a Freedom of Information request to the Department of Communities and Local Government. Previously, only partial datasets had been made widely available, which lacked crucial information such as the type of building to which the DEC applied. This made large scale analysis almost impossible.

Using the FOI-released material, the research team were able to combine information from the certificates with data collected from Ofsted to create a detailed schools database covering about 40% of the primary and secondary schools in England, including academies.

Their findings, published in the new issue of the journal Building Research & Information, explore the key factors affecting energy use in schools, including the type of school, location, and the type of heating, ventilation and air conditioning system it uses.

In general, it was found that existing benchmarks for energy consumption in schools had over-estimated the fossil-thermal energy they need (primarily to heat the buildings), but underestimated the amount of electrical energy schools consume.

The study also found significant differences in energy use between different school types. Both secondary schools and academies were typically found to have higher annual CO2 emissions per m than primary schools (6% and 27% respectively). Taking account of the different pupil densities was found to accentuate these differences: typical CO2 emissions per pupil were found to be 47% higher in secondary schools, and 116% higher in academies, both compared with primary schools. These differences are due mostly to greater electrical consumption. Academies typically use one-and-a-half times the electricity per pupil compared with secondary schools, and over twice that of primary schools.

Professor Koen Steemers, Head of the Department of Architecture at the University of Cambridge and one of the authors of the new report said: “This research shows that design strategies to reduce heat loss have been moderately effective but have been offset by increasing electricity demands, for mechanical ventilation, lighting or equipment.”

Researchers believe that a combination of different reasons explains the rise in schools electricity consumption. One may be the increase in recent years in IT facilities and other technology to support teaching and learning.