AIM Europe
- Manufactures active harmonic filters and electronic power factor correction equipment.
- http://www.aimeurope.com/

Enspec Power Ltd
- Manufacturers of power factor correction equipment and harmonic filters. Specialists in power quality and high voltage engineering.
- http://www.enspecpower.com

Hale Instruments Ltd.
- Specialists in power factor capacitors, motor capacitors and obsolete electronic components. Based in Altrincham UK.
- http://www.haleinst.co.uk

Beluk Power Factor Control from Illimite & the BLR series of PF control relays
- Beluk.com is the home of information on Beluk Power Factor Controllers. Details on individual models and power factor correction theory are included.
- http://www.beluk.com

Syscon
- Manufacture of equipment that maintains the quality of power with information on products, client list and company profile. From India.
- http://www.syconindia.com

Cos Phi Inc.
- Designers and manufacturers of power factor and power quality correction equipment for industry.
- http://www.cosphi.com

Power Correction Systems, Inc.
- Manufactures harmonic power correction filters.
- http://www.activeharmonicfilters.com/

Phaseco, Inc.
- Provides design, engineering, equipment and installation services for power factor correction capacitor and harmonic filter systems to the large industrial, commercial and manufacturing industries.
- http://www.phaseco.com/

Myron Zucker, Inc.
- Manufacturers of power factor correction capacitors and harmonic filters.
- http://www.myronzuckerinc.com/

Phasetech Ltd
- Power factor correction equipment. From UK.
- http://www.phasetech.co.uk/

Electenergy Technologies Inc.
- Energy saving and power conditioning system.
- http://www.electroflow.com/

RCCS
- Distribution power factor correction and VAr/voltage control.
- http://www.rccscontrols.com/

MTE Corporation
- Designer and manufacturer of line and load reactors, broad band harmonic filters and DC link chokes with information on products and technical articles.
- http://www.mtecorp.com/

Commonwealth Sprague Capacitor, Inc.
- Manufacturer of low and medium voltage power factor correction capacitors, harmonic filters and motor run capacitors.
- http://www.comsprague.com/

Northeast Power Systems, Inc. (NEPSI)
- Manufactures custom-engineered power factor correction equipment and harmonic filters.
- http://www.nepsi.com/

Mesta Electronics, Inc.
- Digital power factor and harmonic managers.
- http://www.mesta.com/

Power Capacitors Ltd
- Power factor correction equipment and single to three phase convertors. From UK.
- http://www.powercapacitors.co.uk/

Yuhchang Electric Co., Ltd.
- Manufacturer of power capacitor, automatic power factor regulator, series reactor and rechargeable lead calcium battery. From Taiwan.
- http://www.capacitor.com.tw/

Steelman Industries
- Electric power capacitors, capacitor cabinets and boxes also power factor correction capacitors.
- http://www.steelman.com/