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Powerstar voltage optimisation, proudly made in Britain


Voltage Optimisation

Powerstar is a unique voltage optimisation system which effectively saves energy costs and carbon emissions.

Powerstar voltage optimisation systems have been designed and manufactured in the UK for over ten years by EMSc (UK) Ltd, market leaders in the design and manufacture of energy management systems.

Often described as the ideal energy saving solution, Powerstar voltage optimisation systems have been installed into a vast array of industries. Powerstar has been installed into a wide range of sites including government departments and local authorities, large blue chip clients, supermarket and retail sites, hotel and leisure facilities, NHS and healthcare estates and small to medium businesses.

Powerstar is a secure and reliable system that boasts no failures and 100% reliability through thousands of installations over the last decade.

The Powerstar voltage optimisation system is available in three variations ensuring the solution can be adopted onto a range of varying sites, the options include:


The Powerstar system is the only voltage optimisation unit in the world to be granted a patent, it reduces the voltage of a site by a set amount to reduce maximum load demand and cut electricity costs. 

Powerstar MAX:

The electronic-dynamic MAX system supplies voltage at a constant level regardless of input instability, a vital feature for sites with critical equipment, high night loads and greater security requirements such as hospitals, data centres, hotels and education facilities. 

Powerstar HV MAX:

A HV transformer with low loss amorphous core that utilises the electronic-dynamic Powerstar MAX technology to achieve high efficiency and save huge amounts of energy. Ideal for new builds, sites with older transformers and those with physical space restrictions which make Powerstar and Powerstar MAX solutions difficult to implement.

Fully designed and manufactured in the UK, Powerstar is a worldwide recognised market leader in voltage optimisation. It is manufactured to the highest efficiency, using the highest quality components and holds the acclaimed Made in Sheffield accreditation as a mark of manufacturing quality.

Powerstar is not an off-the-shelf product; it represents an engineering solution, and the Powerstar team will provide a fully supportive approach from the outset to ensure the best solution is identified for your site to provide optimum savings and carbon reductions.

Follow the links below for more information on the range of Powerstar products or contact us for more information.


Find out savings we have achieved for some of our customers by reading our case studies


Read what our customers have to say about working with Powerstar to implement voltage optimisation at their sites


Powerstar is a multi-award winning voltage optimisation system that is accredited by a number of associations and sustainability organisations.

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Leeds Voltage Optimisation Seminar Breakfast

Location: Leeds United FC
Date: Tuesday 16th September
Cost: Free


July 14: Voltage Optimisation is formally launched in Puerto Rico

Creator of Powerstar, the world’s market leading voltage optimisation system, Dr Alex Mardapittas, was the key note speaker at the first technology showcase to be held in Puerto Rico...