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Last updated: February 2026
This directory lists 50 capacitor bank manufacturers across the United States, from modular fixed banks for small industrial applications to complex, high-voltage automatic power factor correction systems for utility grids.
Buyers engage these manufacturers to solve a range of critical power quality issues, including eliminating utility power factor penalties, enhancing voltage stability across critical loads, reducing overall demand charges, and mitigating harmonic resonance that can severely impact equipment longevity. Accurate KVAR sizing and the proper application of detuned banks are frequently central to these challenges.
Within this space, suppliers often specialize. Some are original equipment manufacturers (OEMs) providing standardized, off-the-shelf units suitable for common applications. Others operate as custom system integrators, engineering bespoke solutions for high-voltage requirements, intricate harmonic filtering, or dynamic reactive power compensation. A smaller segment focuses on specialized components or refurbishment services for existing infrastructure.
To ensure a successful engagement, buyers should prepare detailed load profiles, any available harmonic analysis reports, current site electrical schematics, and specific environmental operating conditions. Manufacturers, in turn, expect a clear definition of the problem to be solved and the performance metrics required, often requiring collaboration on site-specific data collection.
A notable trend within this category is the growing adoption of active harmonic filters and dynamic reactive power compensators as complements or alternatives to traditional passive capacitor banks. This shift is driven by the increasing penetration of highly non-linear loads like VFDs and LED lighting, which demand more adaptive and precise power quality solutions than fixed or even switched capacitor banks can provide alone.
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50 companies nationwide
Based in Albuquerque, NM, Alpha-Omega Power Technologies (AOPT) manufactures high voltage pulsed power products. Since 1997, AOPT has specialized in designing and producing capacitor banks, pulse generators, and HV switching solutions for industrial and government customers. They also offer pulsed solar simulators.
Based in Ogallala, NE, ASC Capacitors, a division of American Shizuki Corporation, manufactures high-quality film and foil capacitors. The company produces components essential for various electrical applications, including the construction of capacitor banks, serving industrial and commercial B2B customers with its products.
Atlantic Power Energy offers innovative power solutions, specializing in products for power factor correction, including IoT-enabled capacitor banks. They also provide industrial DC chargers and rack-mount inverters. Serving industrial and commercial operations, the company focuses on enhancing electrical quality, reliability, and energy efficiency with cost-effective solutions.
Becker Mining USA, based in Bristol, VA, manufactures high voltage capacitor banks and robust electrical equipment for mining applications. Specializing in energy distribution, automation, and protection systems, the company engineers products for challenging environments. All systems undergo extensive factory testing to industry standards.
Based in Kilgore, TX, Steelman manufactures capacitors and converters. They produce automatic and fixed power factor correction equipment, along with rotary and static phase converters. The company has supplied dependable products for over 50 years.
Casey USA, based in Doral, FL, manufactures power quality systems such as Static Var Compensators (SVC), Active Power Filters, and Automatic Power Factor Correction (APFC) solutions. They directly provide capacitor banks, integral to their APFC systems, for industrial and commercial applications to improve power factor and reduce energy costs.
Headquartered in Anaheim, CA, Composite Power Group manufactures various medium voltage capacitor banks, including open-air, fused rack, and enclosed metal-clad types. They also produce harmonic filters, switchgear, and electrical distribution and protection equipment. The company serves the electrical power industry from its US manufacturing facilities.
Based in Oneonta, NY, Custom Electronics, Inc. designs and manufactures high-quality custom reconstituted mica paper capacitors, high-voltage mica capacitors, and metallized polypropylene film capacitors. They also provide integrated electronic sub-assemblies, customized capacitor packages, and bus bars for military, industrial, and commercial applications.
Based in Bristol, VA, Federal Pacific is a manufacturer of capacitor banks. The company builds custom capacitor banks in a variety of configurations, providing tailored solutions for diverse industrial and commercial power management applications.
Based in Pomona, CA, Electrocube designs and manufactures electrolytic capacitor banks for power applications. Since 1961, this family-owned company produces custom, R&D prototypes, and standard passive and power electronic components from its U.S. facilities. They serve electronic design engineers, OEMs, and contract manufacturers.
Based in Milpitas, CA, Empower Semiconductor manufactures advanced E-CAP™ capacitors and vertical power delivery platforms. They provide high-performance power integrity solutions for AI and HPC processors, enabling scalable kilowatt-class power delivery. Their innovative E-CAP™ technology surpasses traditional Multi-Layer Ceramic Capacitors.
GA-EMS designs, develops, manufactures, and tests high-voltage capacitors, pulsed power systems, and energy storage banks. The company supports critical applications in energy, defense, and advanced research, including breakthroughs in inertial fusion energy. It provides robust solutions for complex power demands.
GE Vernova manufactures high voltage capacitor bank equipment, providing internally fused, externally fused, and fuseless designs for various applications. The company drives innovation to transform the future of energy access and electrical infrastructure.
High Energy Corp. manufactures high voltage and high frequency capacitors for various applications. The company offers quick turnaround and a one-week lead time on standard capacitor products after order receipt, serving diverse industrial needs from its Pennsylvania facility.
Based in Baton Rouge, LA, inoLECT custom-engineers power capacitor banks for industrial, commercial, and transmission and distribution power systems. Their solutions are designed for diverse applications across various electrical grid environments.
Based in Oneonta, NY, IOXUS manufactures ultra capacitor cells and modules, offering ISO 9001:2015 certified energy storage solutions. The company serves transportation, industrial, and grid-connected applications with reliable products, maintaining manufacturing facilities in the United States and Japan.
Based in Camarillo, CA, Johanson Dielectrics manufactures power electronics solutions, specializing in ceramic capacitors, high voltage, high temperature, planar, EMI filters, and leaded capacitors. The company provides essential components and solutions for various demanding electronic applications.
Based in Menomonee Falls, WI, MTE Corporation manufactures advanced power quality and harmonic mitigation solutions for industrial and commercial applications. Specializing in passive and active harmonic filters and power conditioning units, the company improves power reliability and efficiency for sectors including HVAC, food & beverage, and logistics.
Based in Sterling Heights, MI, Myron Zucker, Inc. manufactures power factor correction capacitor systems. They offer fixed and automatic capacitor banks, including Traymount brand units for motor control centers. These systems reduce reactive power from utilities, helping clients lower utility bills and improve energy efficiency.
NEPSI manufactures medium-voltage metal-enclosed power capacitor banks and harmonic filter banks for electric power systems. Based in Queensbury, NY, the company provides solutions to mitigate power factor correction and harmonic distortion concerns, offering engineering, technical, and industry expert support throughout the project lifecycle.
Based in Morgan Hill, CA, Pacific Capacitor Co. designs and manufactures high voltage mica capacitors. The company serves defense, aerospace, medical, and industrial applications, with all products designed and manufactured in the United States to rigorous electrical and environmental standards.
Presidio Components manufactures a diverse range of high-performance ceramic capacitors, including multilayer ceramic chips, power-stack capacitors, ultra high Q capacitors, and SMPS stacked capacitors. The company specializes in custom stacks and custom assembly, providing tailored solutions for high-frequency and high-power applications in various industries.
RONK ELECTRICAL INDUSTRIES manufactures American-built power factor correction capacitors designed to optimize electrical efficiency and reduce power costs. With over 75 years in business, they also provide emergency generator tap boxes and portable generator accessories.
Scott Manufacturing Solutions manufactures custom-configured substation capacitor banks. They also provide durable, medium voltage enclosures with integrated components, designed to withstand corrosion and external factors. Products meet NEMA, ANSI/IEEE, and Western Underground Committee standards.
Siemens Energy manufactures high-voltage equipment and components to strengthen power grids, serving urban, offshore, and renewable energy projects. With significant investments and job creation in the United States, the company actively contributes to essential infrastructure and market momentum within the energy sector.
Based in Miamisburg, OH, Staco Energy provides power quality and conditioning solutions for critical operations. They manufacture and supply products including UPS systems, emergency lighting inverters, and StacoVAR MV fixed capacitor banks for voltage regulation and power factor correction. Staco Energy serves data centers, medical facilities, and manufacturing plants.
Based in San Diego, CA, Tecate Group is a manufacturer and supplier of electronic components and modular energy storage solutions. They offer ultracapacitors, lithium-ion capacitors, and custom power solutions. Serving diverse markets including military/aerospace, industrial, medical, and smart grid, Tecate simplifies complex energy-storage requirements with quality components.
Based in Amherst, NY, TCI An Allient Company manufactures active and passive filters for harmonic mitigation and power quality improvement. They provide solutions for IEEE-519 compliance and enhanced motor protection, partnering with OEMs worldwide. With over 50 years of experience, their products are made in the USA.
Based in Greensburg, PA, T-Star Engineering manufactures advanced power correction systems in their US-based plant. Specializing as dynamic voltage experts, the company builds TSC-based Static Var Compensator (SVC) systems. These solutions improve power quality and factor for industrial and commercial applications.
Woodruff Engineering designs and manufactures custom high-power capacitor banks and power supplies. Specializing in demanding applications like fusion energy research and industrial environments, they deliver megawatt-class pulsed or continuous power solutions with exceptional stability. They are ISO 9001:2015 certified and committed to quality manufacturing.
Based in San Diego, CA, Wright Capacitors, Inc. manufactures ceramic capacitors and assemblies. With four decades of experience, the company produces a wide array of ceramic capacitors in diverse types and configurations. They provide crucial components for industrial and commercial applications, directly supporting capacitor bank manufacturing requirements.
Based in Orlando, FL, Capacitech Energy, Inc. manufactures advanced, fully integrated supercapacitor systems. These modular systems are engineered for high-power, rapid-response applications, providing millisecond power protection for data centers, utilities, and power producers. They focus on practical, easy-to-deploy, and scalable energy storage solutions.
Based in Rancho Cucamonga, CA, Celec Enterprise manufactures smart capacitor banks. The company produces the ES-1 series, designed for efficient operation at half the rated voltage, serving industrial and commercial B2B customers.
Based in San Diego, CA, Elspec LTD specializes in manufacturing dynamic reactive power compensation systems. These systems are designed to reduce voltage drops and stabilize voltage levels for various industrial applications, including gas processing facilities. Elspec's solutions enhance power quality and efficiency by actively managing reactive power and harmonics.
Based in Glendale, WI, Maxwell Technologies develops and manufactures energy storage and power delivery solutions. The company specializes in ultracapacitor products, providing cells and modules for applications across consumer, industrial, renewable energy, automotive, transportation, and IT sectors.
Based in San Antonio, TX, Vishay manufactures a range of capacitors for power electronics and other industrial applications. The company specializes in producing wet and conformal-coated tantalum capacitors. Vishay provides essential capacitor components suitable for the assembly of various capacitor bank configurations.
Based in Plymouth, MN, AMP Manufacturing builds custom and standard electrical power distribution equipment. They provide switchgear, panelboards, and medium voltage solutions designed for reliability and easy installation. Serving commercial, residential solar, stadium, data center, and marina industries, AMP delivers quality-engineered equipment.
Based in Houston, TX, Cordyne Inc. manufactures industrial control systems and electrical equipment. They specialize in solid state-controlled harmonic filter systems, including single and multi-frequency notch filters and high pass filters. With in-house engineering and manufacturing, Cordyne delivers reliable electrical system solutions for diverse industrial applications.
Based in Beaver, WV, Elgin Power Solutions designs, manufactures, and installs capacitor banks for power factor correction and stable voltage. They specialize in custom-engineered electrical power systems, including factory-built and mobile substations, along with switchgear. The company operates its manufacturing facility in West Virginia.
Based in Alameda, CA, Powerside provides innovative measurement, intelligence, and corrections solutions for power quality challenges. They help organizations reduce wasted energy from reactive power demand, improve power factor, and address issues like harmonics and voltage fluctuations for enhanced operational performance.
Based in East Providence, RI, Quantic Evans manufactures high-energy density capacitors for demanding, mission-critical applications. The company provides power-dense capacitor technology for defense, aerospace, and energy exploration, focusing on high reliability and SWaP savings. They utilize a patented hybrid wet tantalum technology.
Resource Engineered Products (REP) specializes in power quality and power factor correction solutions. Based in Sumner, WA, the company engineers, manufactures, and installs custom low and medium voltage capacitor banks and harmonic filter banks. They provide integrated systems designed to improve power factor, enhance voltage stability, and reduce network losses for various industrial and commercial applications.
Based in Rosharon, TX, Saber Power custom-engineers and manufactures power capacitor banks. These solutions provide reliable, efficient reactive power compensation, improving power quality and system efficiency. The company serves industrial, commercial, and utility sectors with their specialized offerings.
Based in Hampton, GA, Southern States LLC manufactures high-reliability capacitor banks. They specialize in partially pre-assembled units designed to reduce on-site work, leveraging decades of experience in power switching and protection solutions, including CapSwitcher™ technology.
American Capacitor is a manufacturer specializing in custom capacitors, offering both unique and low-cost solutions. Approved to Mil-I-45208 standards with FSCM 59366, the company produces high-quality, reliable capacitor components. They focus on meeting specific client requirements for various industrial applications.
G&W Electric, based in Bolingbrook, IL, manufactures electric power distribution equipment. They specialize in power quality solutions, designing and testing pole, substation, and pad mount capacitor and filter banks. The company also provides current and voltage sensor solutions for new distribution systems, serving industrial and utility customers.
Hubbell Power Systems produces factory-assembled, pre-wired standard capacitor banks designed to simplify reactive power reduction. These components are supplied to cooperatives and public power utilities, offering reliable solutions for electrical system management.
Schneider Electric USA manufactures smart low voltage capacitor banks for UL/CSA applications. Their Ecostruxure-ready solutions deliver advanced power factor correction, reducing energy consumption and enhancing electrical system efficiency. The company provides innovative products designed for industrial and commercial customers seeking robust energy management and improved power quality.
Siemens provides comprehensive lines of low voltage power distribution equipment for industrial and energy sectors. A global technology company, Siemens also offers innovative grid software and consultancy services, enabling transmission and distribution grid operators to transform their infrastructure. They are a significant manufacturer in the electrical power systems domain.
Mersen manufactures standard and custom capacitor solutions for power conversion, utilizing advanced aluminum electrolytic and film capacitor technologies. This global expert in electrical power and advanced materials provides direct manufacturing services for diverse industrial and commercial B2B applications. Mersen is located in Bay City, MI.
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| Type | Best For | Typical MOQ |
|---|---|---|
| OEM Manufacturer (Standardized Units) | Clear power factor correction needs, smaller to medium KVAR requirements, facilities with predictable and stable loads, budget-conscious projects. | 1-5 units |
| Custom System Integrator | Complex facilities, highly variable loads, significant harmonic distortion, high-voltage applications, utility-scale projects, bespoke engineered solutions. | 1 custom project |
| Repair & Upgrade Specialist | Extending the operational life of existing capacitor banks, replacing failed components, increasing capacity of current installations, specific component sourcing. | Service contract or 1-off repair |
Fixed capacitor banks are best suited for loads with consistent, predictable reactive power demands and stable power factors. Switched, or automatic, capacitor banks use contactors or thyristors to add or remove capacitor steps in response to fluctuating reactive power, preventing over-correction during light loads and ensuring optimal power factor correction across varying operating conditions. Your load profile and the extent of power factor variation will dictate the appropriate type.
Detuned capacitor banks include series reactors designed to shift the resonant frequency of the bank below common harmonic frequencies (typically the 5th or 7th). They are essential when your facility has significant non-linear loads (e.g., VFDs, UPS systems) that generate harmonics. Without detuning, traditional capacitor banks can create parallel resonance with the grid, amplifying harmonics and potentially damaging capacitors, transformers, and other electrical equipment.
To receive an accurate and appropriately designed solution, provide recent utility bills showing power factor penalties, a one-line diagram of your electrical system, detailed load profiles over typical operating cycles, specifics on any existing or planned non-linear loads (e.g., quantity and type of VFDs), and any available harmonic analysis reports. Information on environmental conditions and available space is also critical.
Yes, beyond general electrical maintenance, capacitor banks require periodic thermal scanning to identify hot spots caused by internal degradation or loose connections. Regularly check for signs of capacitor leakage, bulging, or discoloration, and ensure all fuses are intact and correctly rated. Verify the accuracy and operation of the control system and protection relays, and clean ventilation openings to ensure adequate cooling, as overheating significantly shortens capacitor life.