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Case Studies

St John’s School & Sixth Form College






St John’s School & Sixth Form College, a Catholic Academy in County Durham was opened in 1964 and has seen extensive redevelopment and extension since. The school has been continually maintained and improved to a high standard which has enabled the school to retain its essential character while adapting to the changing demands of education.


Whilst the school is proactive in looking at ways to reduce their energy a primary concern was that 5-10 PC monitors were failing every week and the school network was going offline. Other issues were the air handling unit in the site’s kitchen intermittently going into reverse which shut off the gas supply causing major problems with the food preparation. Food mixer motors were also burning out and the pumps for the swimming pool failing prematurely.


Three-phase logging equipment was installed to analyse the incoming and site power quality. The analysis showed excessive 3rd harmonics causing the site failures. The Powerstar unit was specifically wound to correct the 3rd harmonic issues. Post-installation the power quality issues have now been resolved and the correct voltage applied to the sites electrical equipment. A secondary benefit through voltage optimisation is the site is now saving £8,125 in annual electricity costs.


The lifespan of equipment on site has now returned to normal with 3rd harmonics issues resolved and 81,614 kWh saved per annum. This amounts to £8,125 in annual electricity costs.


reduction in annual electricity costs and 81,614 kWh in energy consumption.

Also, The lifespan of electrical equipment has now returned to normal.

Customer Quotation

Many thanks to EMS for a professional service provided.I can highly recommend voltage optimisation as a energy-saving & power quality solution to the education sector.

Mr Alan Greensitt, Director of Finance and Resources

Contact us to discuss how our Voltage optimisation systems can support your organisation with its energy objectives

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Voltage Optimisation

Optimising the incoming voltage to your site to improve quality, saving energy and costs.

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Surrey University saved 189,474kWh per year, meeting their initial objectives in terms of suitability, effectiveness and return on investment period.


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