2. What does voltage optimisation do?

3. What is Voltage Optimisation?

4. “… only achieve 55% of its rated life”
What do the Experts say?
“A 230V linear appliance used on a 240V
supply will take 4.3% more current and will
consume almost 9% more energy …” and
“… only achieve 55% of its rated life”
Savings with Voltage Optimisation completely depends on the load the company has and therefore a full site survey is essential.

5. Why is it important to optimise site voltage?
In addition, VO helps with Targets, obligations, pressures…
Reduce kWh
Reduce CO2
CRC, CSR
Save money

6. Reduces kWh Consumption
How does Voltage Optimisation help?
Reduces kWh Consumption

7. Will everything consume less energy?
NO not everything …
Greatest savings come from inductive loads (Motors, Lighting)
Some loads will yield less savings (VSDs)
Some loads will yield zero savings, but will benefit in other ways
It is important to understand the electrical loading characteristics of your site.
Remember no two sites are the same

8. Installation

9. Optimise at HV side or LV side?
The diagram below shows a typical onsite plant room set-up, without any voltage optimisation technologies being utilised

10. Optimise at HV side or LV side?
The diagram below shows the same typical plant room set up, but highlights where Powerstar voltage optimisation technologies can be installed on either the HV or LV supply
High voltage side
Low voltage side
POWERSTAR HV MAX: An amorphous core super low-loss transformer with integral voltage optimisation and electronic-dynamic regulation
POWERSTAR VOLTAGE OPTIMISATION SYSTEM: Available in fixed or electronic-dynamic variations
Powerstar voltage optimisation system, available in fixed or electronic-dynamic variations

11. Case studies and testimonials

12. Guoman Hotels Group Ltd – Thistle Hyde Park
Total before (kWh) (24 days)
Total after (kWh) (24 days)
Savings (kWh)
% Savings %
Annual savings based on 8p/kWh £10,891
“So far the Powerstar installations in our hotels have achieved as much as an amazing 26.1% saving in total electricity consumption at our Thistle Hyde Park Hotel and elsewhere, never less than an 11.5% saving.”
David Hannah, Head of Property, Guoman Hotels Group Ltd

13. Department for Business Innovation & Skills
Seven Powerstar units were installed into BIS, the results of five of these installations are shown below. Two of the units currently have no data for savings as BIS changed the meter and have not had data since.
Annual energy consumption reduction and cost savings
Unit 1: 24.7% reduction / £8,067 saving
Unit 2: 11.3% reduction / £3,391 saving
Unit 3: % reduction / £4,537 saving
Unit 4: 8.59% reduction / £6,598 saving
Unit 5: 6.2% reduction / £8,204 saving

14. NHS – Ashworth Hospital
The hospital were looking for a reliable system to effectively reduce high energy costs and consumption caused by lighting, plant & IT equipment in the hospital.
Following the installation of four Powerstar units the hospital is benefiting from the following savings:
Savings (kWh) 458,272
% Savings 12%
Annual savings £51,213
Payback period 3 years

15. Derby City Council Savings (kWh) 128.972 % Savings 14.6%
Derby City Council is aiming to reduce its carbon emissions by 25% by 2013/14 as part of a ‘Climate Change Strategy’.
The Council’s Eagle Centre market, Environmental Services parks management depot and the Market Hall have had Powerstars installed.
Savings (kWh)
% Savings %
Annual savings £10,000
Emission Reductions tonnes

16. TEV Ltd Total before (daily) 857.8kWh Total after (daily) 704.9kWh
Two Powerstar units creating a 125kVA system were installed at TEV to optimise the incoming supply to the factory. As a result an actual reduction in electricity consumption of 17.8% was achieved.
Total before (daily) kWh
Total after (daily) kWh
Savings (kWh) kWh
% Savings %
“The installation of the Powerstar systems has
cut our energy cost by nearly 20%”
Chris Chisman, Engineering Manager, TEV Limited

17. University of Surrey Savings (kWh) 189,474 % Savings 8.1%
The University of Surrey has held sustainability at the heart of its CSR agenda for over a decade. The campus is home to 17,900 students and 2,597 staff and views investing in sustainable technology as a critical component.
Savings (kWh) ,474
% Savings %
Annual savings £13,911
Payback period years

18. London City Hall % Savings: 13.6%
Home of the Greater London Authority accommodates the Mayor of London, the London Assembly and 600 or so permanent GLA employees..
% Savings: %

19. Can we help?
YES, we can…
If you are not sure what to do to reduce your energy consumption, contact us and we can organise a free
no-obligation proposal.
Call us on +44 (0) or
us at

20. Civic Offices Installed ~2008/9
Large office building with considerable amounts of LF Lighting and various pumps, fans etc.
Paid for through corporate Invest to Save fund
Expected 10% saving
Achieved: uncertain as new data centre installed around the same time but very likely exceeded 10%
Has now been removed as building sold - will be relocated to suitable building

21. Oakengates Leisure Centre
Installed 200kVa unit in 2010
Leisure centre with large swimming pool with considerable amounts of LF Lighting and pool equipment including AHU, pumps, fans etc
Paid for through Salix – 0% Loan
Expected annual saving of 32,000kWh (~9%) leading to 4 year payback
Achieved: uncertain as building extended at the same time. Likely exceeded 10%

22. Oakengates Theatre Installed 288kVa unit in 2011
Mixed use building. Primarily theatre but also children's centre. Large AHU unit with pumps, fans etc.
Paid for through Salix – 0% Loan
Expected annual saving of 25,000 kWh (9.3% - guaranteed) leading to 5 year payback.

23. Oakengates Theatre – AMR
Achieved savings – 27,063 kWh year on year (~£3,200)

24. Contact Details
Please contact Elliot Jones – Sustainable Development Officer
Call: