Power Factor Correction and Surge suppression devices, UK - Power Efficient Systems. Power Efficient Systems Ltd are specialists in surge suppression devices and power factor correction. Based in the UK we supply UK businesses with surge suppression devices and power factor correction solutions. Manufacturers for the UK of Surge suppression devices and power factor correction solutions. Surge suppression devices and power factor correction can lower your bills, Surge suppression devices and power factor correction can reduce running costs.