NETA accreditation ensures top-tier electrical testing services for mission-critical facilities like data centers and energy infrastructure. This certification confirms adherence to strict industry standards, providing unbiased testing and maintenance to prevent costly failures. Below are key takeaways from the 2026 list of NETA-accredited firms:
| Firm Name | Voltage Range | Focus Areas | Coverage | Unique Strength |
|---|---|---|---|---|
| RESA Power | Up to 345kV | Data centers, energy, renewables | U.S. & Canada (50+ sites) | Broad network, renewable expertise |
| Asplundh Electrical Testing (AET) | Up to 750kV | Utilities, hospitals, pharmaceuticals | Northeast & Mid-Atlantic | High-voltage testing, precision results |
| Shermco Industries | 480V–15kV+ | Data centers, utilities | U.S. & Canada (41 sites) | Largest NETA firm, 700+ technicians |
| High Potential Testing (HPT) | LV, MV, HV | Emergency response, diagnostics | Mid-Atlantic region | 2-hour emergency service |
| Inrush Electrical | Low, medium, high | SCADA, GOOSE messaging | Canada | Advanced lab testing |
NETA-accredited firms are essential for ensuring the safety and reliability of critical electrical systems. Always verify accreditation through the official NETA directory before selecting a partner.
2026 NETA Accredited Electrical Testing Firms Comparison Chart
NETA accreditation is an independent certification that confirms firms meet the highest standards in the industry. The International Electrical Testing Association (NETA), an ANSI-accredited organization, develops these standards to guide the testing, inspection, and maintenance of electrical power systems. The goal? Spot installation issues and equipment defects early on to prevent bigger problems down the line.
This accreditation plays a critical role in ensuring rigorous testing throughout the lifecycle of a project. Whether it’s for power and energy infrastructure, hospitals, or advanced manufacturing facilities, NETA-accredited firms provide reliable results that align with NETA, NERC, and utility standards. Importantly, these companies are required to remain vendor-neutral, which ensures unbiased testing and results.
The scope of NETA accreditation includes both initial acceptance testing - confirming proper installation - and ongoing maintenance testing to ensure equipment stays within operational specifications. For most electrical equipment, visual and mechanical tests are recommended at least once a year. However, critical safety systems or high-use equipment might need inspections every one to two months. This thorough approach helps minimize downtime and boosts safety in data centers and energy projects.
Recent updates to NETA standards have further raised the bar. ANSI approved two key revisions: the ANSI/NETA ETT-2026 (Standard for Certification of Electrical Testing Technicians) on December 1, 2025, and the ANSI/NETA EMW-2026 (Standard for Qualification of Electrical Equipment Maintenance Workers) on January 6, 2026. These changes align with NFPA 70B-2023, which now makes proper electrical equipment maintenance mandatory and enforceable. This shift from voluntary to required maintenance programs has prompted companies like Mid-City Electric Technologies to join NETA's Qualified Electrical Equipment Maintenance Company (QEMC) program to meet compliance standards.
NETA-accredited firms employ certified technicians trained to work on low-, medium-, and high-voltage systems according to standards set by the NETA Standards Review Council. Some companies, such as Inrush Electrical, go a step further by using specialized labs for tasks like relay configuration validation and SCADA protocol simulation. This factory-style testing in controlled environments allows them to address potential issues before deployment, reducing risks for complex industrial and renewable energy projects.
RESA Power ranks as one of the largest NETA-accredited electrical testing providers in North America, operating from over 50 locations across the U.S. and Canada. With this widespread network, they deliver the resources of a national company while responding quickly to local needs - an essential combination for data centers and energy projects that demand swift and dependable service. Here’s a closer look at how their capabilities support critical projects.
RESA Power handles testing and maintenance for electrical systems up to 345,000 volts, covering low-, medium-, and high-voltage requirements. This service is vital, especially considering that up to 30% of new equipment failures result from mishandling or improper installation - issues their testing services aim to address.
The company’s expertise lies in providing tailored solutions for data centers, energy infrastructure, and industrial facilities where power reliability is non-negotiable. Their services include partial discharge testing, power quality monitoring, and round-the-clock emergency response. Additionally, RESA Power supports renewable energy initiatives with solar PV engineering and EV charger installation services.
As a NETA Accredited Company (NAC), RESA Power employs NETA Certified Technicians for both acceptance testing (ATS) of new equipment and maintenance testing (MTS) of existing systems.
"This accreditation means that our technicians adhere to NETA's rigorous certified standards, ensuring full compliance with ANSI/NETA safety regulations" - Zak Houk, General Manager of RESA Power Canada
Their team also includes manufacturer-certified technicians, Master Electricians, and cable splicing specialists.
RESA Power has a strong presence in key U.S. regions, including California (Los Angeles, San Jose, Sacramento), the Northeast (New Jersey, New York, Pennsylvania), the Midwest (Michigan, Ohio, Illinois), and the South (Texas, Florida, North Carolina). This broad reach allows them to deliver consistent service for large-scale, multi-state construction projects. Specialized divisions like Power Plus Engineering focus on regional markets, such as Michigan, Ohio, and Indiana.
With its expansive network, advanced testing capabilities, and certified expertise, RESA Power is a trusted partner for complex data center and energy projects.
Asplundh Electrical Testing (AET) was established in December 2023 through the merger of American Electrical Testing and Burlington Electrical Testing. With over 40 years of experience from each entity, this merger positions AET as one of the leading independent electrical testing firms in the United States.
AET specializes in testing and maintaining power systems that handle up to 750,000 volts. This capability makes them an ideal choice for utility-scale transmission infrastructure and substation projects, where high-voltage reliability is essential. Their testing equipment is calibrated to NIST standards, ensuring precise results across all voltage ranges. This level of accuracy supports AET's ability to manage large-scale, critical projects effectively.
AET focuses on delivering turnkey solutions for essential facilities such as data centers, hospitals, electric utilities, and pharmaceutical plants - places where power disruptions can have serious consequences. They provide independent third-party verification to confirm that equipment is installed and functioning correctly before being energized. Tom G., a substation manager, shared his experience:
"The team at AET went above and beyond when they brought to our attention potential risks around a possible failure. Their quick action diverted a potentially dangerous situation, saving so much more than time and money".
For critical projects like data center construction, AET's thorough approach ensures reliable first-time energization, a vital step for facilities that cannot afford downtime.
AET is recognized as a NETA Accredited Company, meeting strict third-party standards for both acceptance testing (ATS) of new installations and maintenance testing (MTS) of existing systems. This accreditation ensures all work complies with ANSI/NETA standards and that technicians are certified to maintain high competency levels. Their services include acceptance testing, maintenance testing, commissioning, and specialized transformer work.
AET operates across key areas in the Northeast and Mid-Atlantic regions, simplifying coordination for multi-state projects. Their offices are located in Foxboro, MA (corporate headquarters); South Windsor, CT; Baltimore, MD; Boonton, NJ; Brentwood, NY; and Allentown and Croydon, PA. Additionally, AET benefits from the broader expertise of the Asplundh Family of Companies, which has over 95 years of experience in infrastructure, including vegetation management and storm response services.
Megger Group Limited is recognized by NETA as a "Manufacturer and Other Service Provider", rather than as an accredited testing firm. Unlike the NETA-accredited companies mentioned earlier, Megger specializes in producing the precise instruments needed for installation and maintenance verification. While they don't perform testing services directly, their role is vital in supporting the reliability of mission-critical projects by supplying the tools required for accurate assessments.
Megger plays a key role in ensuring compliance with ANSI/NETA standards (ETT and EMW) by providing the essential instruments used by NETA-accredited firms for acceptance and maintenance testing. As a significant contributor to the NETA World Spring 2026 publication, Megger demonstrates its commitment to supporting compliance efforts by equipping testing firms with reliable tools.
Megger does not hold NETA accreditation for acceptance testing (ATS) or maintenance testing (MTS). Instead, it focuses on manufacturing the instruments that accredited firms rely on to conduct these tests. This distinction is important when selecting your project team. Partnering with a NETA-accredited firm that uses high-quality tools - like those produced by Megger - ensures the testing process meets the necessary standards.
OMICRON electronics GmbH plays a key role in the NETA community as a Corporate Alliance Partner, rather than functioning as an accredited testing firm. The company focuses on manufacturing high-performance diagnostic equipment that NETA Accredited Companies depend on for critical electrical infrastructure projects. This partnership highlights the distinct roles within the community: OMICRON supplies the tools, while NETA-accredited firms handle the rigorous field testing.
OMICRON is deeply involved in the energy infrastructure and data center sectors, offering testing solutions tailored to these high-stakes environments. Their equipment supports the commissioning and maintenance of essential power systems, with an emphasis on protective relays, circuit breakers, and transformers. For projects like electric utilities, power plants, and transmission networks, OMICRON’s diagnostic tools are indispensable for ensuring system reliability, whether during initial acceptance testing or ongoing maintenance phases. This clear division of responsibilities strengthens their contribution to the industry.
While OMICRON does not hold NETA accreditation for acceptance testing (ATS) or maintenance testing (MTS), it provides the hardware and software that accredited firms use to meet ANSI/NETA standards. When selecting a testing partner, it's essential to choose a NETA-accredited firm that uses reliable diagnostic equipment, like OMICRON's, to ensure accurate testing and compliance with industry regulations.
Fluke Corporation stands apart from NETA-accredited testing firms. Based in Everett, Washington, this global manufacturer specializes in electrical test and measurement tools. Through a nationwide distribution and support network, Fluke serves the U.S. market, offering tools that are often paired with accredited testing services. For high-stakes projects like data centers and energy facilities, this partnership ensures accurate and unbiased testing results.
Fluke plays a key role in mission-critical projects by providing advanced diagnostic equipment designed to verify system performance. Their product lineup includes power quality analyzers, thermal imaging cameras, and multimeters, all of which are widely used by NETA-accredited testing firms. In projects involving data centers or energy infrastructure, these tools are essential during both commissioning and maintenance phases. They help ensure electrical systems meet the rigorous demands of these high-pressure environments, supporting the stringent testing protocols of NETA-accredited firms.
As a manufacturer, Fluke does not hold NETA accreditation for testing services. NETA-accredited firms must remain independent and avoid any manufacturing conflicts of interest. While Fluke itself is not accredited, its cutting-edge diagnostic tools are vital for ensuring compliance and reliability in testing. Construction leaders managing electrical projects should partner with NETA-certified firms for testing services but rely on trusted manufacturers like Fluke for high-quality diagnostic equipment. Fluke’s tools are a cornerstone in maintaining the precision and reliability required for mission-critical electrical systems.
Bertke Electric, also known as BEC Testing, operates as a NETA Accredited Company (NAC). This accreditation ensures the company remains independent, with no ties to manufacturing or installation, allowing them to deliver unbiased assessments of electrical systems for critical projects nationwide. Their work focuses on bolstering the reliability of vital systems across various industries in the U.S.
As a fully accredited NAC, BEC Testing employs NETA-certified technicians and a Principal Engineer. Their team undergoes extensive training and certification to handle the complex testing needs of facilities like data centers, manufacturing plants, and energy infrastructure. This level of expertise enables them to provide customized solutions for even the most demanding environments.
BEC Testing specializes in acceptance and maintenance testing for electrical systems in mission-critical facilities. They work with systems across a range of voltages - from low to medium (up to 34.5kV) and high voltage - ensuring performance and reliability in environments where downtime can be extremely costly. Their comprehensive approach to testing plays a key role in minimizing disruptions and maintaining operational stability in sectors like data centers and energy.
BEC Testing operates across numerous U.S. regions, offering both scheduled maintenance and emergency diagnostic services. Their consistent quality across all locations gives construction leaders peace of mind, knowing their electrical systems are thoroughly evaluated. Partnering with a NETA-accredited company like Bertke Electric ensures dependable electrical performance from the start of a project through its operational lifecycle.
When it comes to mission-critical projects, ensuring your partners meet strict compliance standards is non-negotiable. This is why evaluating accreditation status is so important.
AA Technology Inc. is not listed as a NETA Accredited Company for 2026. Before committing to any electrical testing firm, it’s essential to verify their accreditation through official NETA resources. Accreditation confirms that a company operates independently and adheres to key safety standards, including OSHA, NFPA 70E, and IEEE guidelines.
Firms lacking verified NETA accreditation may fall short of the rigorous quality and safety benchmarks required for high-stakes projects. For construction leaders and project managers, confirming this status ensures that testing teams are staffed with certified technicians who are prepared to handle complex voltage ranges and critical environments.
To safeguard your project’s integrity, always cross-check company names against the official NETA Accredited Company directory. This simple but critical step ensures you’re working with reliable partners who meet the high standards necessary for mission-critical electrical testing.
Powell Electrical Systems specializes in manufacturing switchgear and power distribution solutions, but it’s important to note that it is not an independent electrical testing firm. This distinction matters, especially for mission-critical construction projects.
Only independent firms can achieve NETA accreditation. Since Powell Electrical Systems operates as a division of Powell Industries and focuses on creating integrated power solutions, it does not have NETA accreditation for testing services.
The company provides engineered switchgear and integrated Power Control Rooms tailored for data centers, electric utilities, substations, and other facilities requiring uninterrupted operations. For construction leaders involved in data center projects, it’s crucial to differentiate between manufacturers and independent testing firms to ensure you’re selecting the right vendor for each role.
When it comes to testing services, you’ll need to work with a separate NETA-accredited firm. These firms typically handle equipment ranging from 480V to 15kV for critical infrastructure.
Always confirm a firm’s accreditation through the official NETA directory before entering into any agreements.
When searching for dependable electrical testing partners for critical projects, it's important to note that "The Electrical Testing Company (ETC)" is not explicitly listed in the NETA-accredited company directory. However, firms with similar names, such as Elecserv Electrical Testing Co. in Brooklyn, New York, and Electrical Testing, Inc., are accredited. This distinction is essential to avoid confusion caused by similar-sounding names.
This scenario underscores the importance of construction leaders verifying a firm's accreditation directly through the official NETA directory before committing to contracts. Misunderstandings can arise from overlapping names or acronyms.
If a company claims NETA accreditation, always request and verify their NETA certificate number. Accredited firms must adhere to the strict ATS and MTS standards set by NETA.
In addition to accreditation, evaluate the firm's experience and regional capabilities. For instance, Elite Testing & Engineering (ETE) is a great example of a company specializing in mission-critical facilities. ETE serves sectors like data centers, utilities, and government facilities, offering services such as procedure development, maintenance scheduling, and comprehensive system training.
When considering a firm with a name resembling "ETC", ensure their geographic coverage matches your project’s location. Also, confirm they have experience handling the specific voltage ranges required for your project. This approach reinforces the importance of verified accreditation and regional expertise when selecting the right partner.
NETA's network of accredited testing firms spans the entire U.S., positioning regional leaders to support facilities where even a brief downtime can lead to significant revenue losses. These firms offer 24/7 emergency response, a crucial service for industries like data center construction and energy infrastructure. This comprehensive network reflects the high standards and dedication to service quality that define all NETA-accredited firms.
When choosing a testing partner, location plays a big role. Having local offices means lower travel expenses and faster response times during emergencies. For instance, Shermco Industries operates out of 41 locations across the U.S. and Canada, with a workforce that includes over 700 NETA-certified technicians and more than 230 electrical engineers. This makes Shermco one of the largest providers in North America. Similarly, High Potential Testing LLC (HPT), based in Havertown, PA, earned NETA accreditation in late 2025 after five years in operation. They offer two-hour emergency testing and fault repair services for the Mid-Atlantic region.
"When we started HPT, we knew that the most important thing we could do for our business was become NETA accredited." - Doug Williams, Co-owner, High Potential Testing LLC
This example highlights the value of regional accreditation for quick and effective service. Here's a closer look at how these firms are positioned to serve across the country.
Regional firms cater to key areas across the U.S., including:
For example, Absolute Testing Services in Houston focuses on industries like data centers and renewable energy, showcasing how NETA accreditation aligns with sectors that demand high reliability.
NETA-accredited firms are equipped to handle a broad range of voltage systems, from low to high voltage. Modernization efforts often target equipment in the 480V to 15kV range, extending asset lifespans by 25 to 35 years. Shermco Industries, for instance, specializes in reconditioning outdated equipment for data centers, offering solutions like SCADA integration and performing critical studies such as short circuit analysis, coordination, and arc flash assessments.
The skill level of technicians is a key factor in the quality of service provided by regional firms. Shermco employs more NETA Level 3 and Level 4 technicians than any other accredited company. These advanced certification levels are essential for managing complex systems like those found in hyperscale data centers and power utilities. When evaluating regional partners, it's important to confirm they have a strong team of Level 3 and 4 certified professionals capable of handling tasks such as relay testing, protective device coordination, and system commissioning with precision.
Selecting the right NETA-accredited partner involves understanding the services and expertise each firm brings to the table. This comparison highlights key differences in voltage testing capabilities, geographic reach, and focus areas, such as data centers and energy infrastructure.
Shermco Industries stands out as North America's largest provider, operating from 41 locations with 700+ NETA-certified technicians and over 230 electrical engineers. They specialize in 480V to 15kV systems, which can extend equipment life by 25–35 years. High Potential Testing LLC (HPT), based in Havertown, PA, offers low-, medium-, and high-voltage testing with an impressive 2-hour emergency response service in the Mid-Atlantic region.
Accessible Consulting Engineers (ACE) has 29 years of experience, completing over 5,300 projects with a 98% client satisfaction rate. They focus on mission-critical facilities like medical centers, military bases (e.g., Camp Pendleton), and airports, specializing in low and medium voltage systems up to 12kV. On the other hand, Apparatus Testing & Engineering provides services across the voltage spectrum, with expertise in data center commissioning, UPS systems, and co-generation plants, primarily serving California.
| Firm Name | Voltage Range | Mission-Critical Focus | Geographic Coverage | Unique Strength |
|---|---|---|---|---|
| Shermco Industries | 480V to 15kV+ (LV & MV) | Hyperscale Data Centers | 41 Locations (US & Canada) | 700+ technicians; largest NETA firm |
| RESA Power | LV & MV | Industrial & Energy Projects | 30+ Locations (US & Canada) | Extensive regional network |
| Accessible Consulting Engineers (ACE) | Up to 12kV (LV & MV) | Medical, Military, Airports | CA, AB (Canada) | 29 years; 98% satisfaction rate |
| Apparatus Testing & Engineering | LV, MV, & HV | Data Centers, UPS, Co-Gen | CA (Regional) | Specialized shop services |
| High Potential Testing (HPT) | LV, MV, & HV | 24/7 Emergency Response | Mid-Atlantic/PA | 2-hour emergency testing |
Geographic reach plays a crucial role in determining response times and cost efficiency. National providers like Shermco and RESA Power offer broad coverage, ensuring consistency across multiple locations. Meanwhile, regional firms like HPT and Apparatus Testing & Engineering excel in delivering tailored expertise to specific markets. When choosing a partner, it’s essential to weigh the benefits of national consistency against the advantages of localized, rapid-response support. This table serves as a guide to understanding the distinct strengths of these leading NETA-accredited firms.
NETA‐accredited firms offer independent, third-party verification that removes conflicts of interest during electrical system commissioning. Unlike equipment vendors who may focus on selling their products, these firms provide unbiased testing to ensure installations meet design specifications and safety standards before being energized. This impartiality is especially crucial in data center construction, where electrical failures can lead to costly downtime. By maintaining vendor neutrality, NETA firms are well-positioned to tackle the evolving demands of modern data center and energy projects.
The rapid growth of AI-driven data centers has introduced new challenges, particularly when it comes to maintaining tight construction schedules. As Robert Hill from Vector Power explains, "The rapid expansion of AI‐driven data center construction has introduced new challenges to an already demanding electrical testing and commissioning industry". To address these challenges, NETA firms have developed specialized capabilities, such as validating relay configurations and conducting IEC 61850 system testing. This includes testing GOOSE messaging and network architecture in controlled environments, which helps reduce risks during on-site deployment.
Compliance with mandatory maintenance standards has also become a priority. Since NFPA 70B-2023 made electrical equipment maintenance enforceable, firms must now adhere to strict regulations. In 2024, Mid-City Electric/Technologies became an early participant in NETA's Qualified Electrical Equipment Maintenance Company (QEMC) program to meet these updated requirements. Additionally, the ANSI/NETA ETT-2022 revision was approved on December 1, 2025, with the next edition set to debut at PowerTest 2026, further enhancing certification standards.
Advanced diagnostic techniques play a key role in extending the life of critical assets and preventing failures. NETA firms utilize tools like thermal imaging, partial discharge testing, and insulation resistance measurements to detect insulation degradation and other issues before they lead to outages. For older electrical systems operating between 480V and 15kV, modernization efforts can extend their lifespan by 25–35 years.
With the rapid expansion of AI-driven data center construction, there’s an increasing demand for skilled electrical testing professionals capable of handling complex commissioning tasks. For mission-critical projects, focus on technicians with NETA Level 3 and Level 4 certifications, as their expertise is essential for hyperscale operations and advanced power and energy infrastructure projects.
Companies like Shermco highlight this demand, employing hundreds of NETA-certified technicians across key locations. These teams conduct NETA Acceptance Testing on essential systems like PDUs and switchgear, ensuring minimal downtime for hyperscale operations. When High Potential Testing LLC (HPT) earned NETA accreditation in November 2025, Doug Williams emphasized its significance:
"When we started HPT, we knew that the most important thing we could do for our business was become NETA accredited".
This example reinforces how certified expertise is crucial for the success of mission-critical projects.
In addition to certification, prioritize candidates with skills in SCCAF studies, power quality analysis, and maintenance of equipment such as PDUs, medium- and low-voltage switchgear, protective relays, and transformers. Professionals trained in predictive maintenance techniques - like certified thermographers experienced in partial discharge testing and insulation resistance measurements - can help prevent costly failures before they occur.
To simplify the hiring process, iRecruit.co connects employers with pre-qualified NETA-certified professionals. The platform specializes in sourcing construction and technical talent for high-stakes sectors like data centers and energy infrastructure. It also offers flexible, success-based recruitment solutions designed for the fast-paced nature of construction projects.
When assessing candidates, ensure they are affiliated with NETA Accredited Companies to maintain independence from equipment manufacturers. Additionally, prioritize professionals who offer mobile repair services and 24/7 emergency support for multi-site projects. These capabilities are key for handling the demands of complex and time-sensitive operations.
NETA‐accredited firms play a key role in ensuring critical installations meet top industry standards before startup, reducing the risks associated with commissioning. This independent verification is especially vital for sectors like data center construction and energy infrastructure, where even short outages can lead to major financial repercussions.
The advantages of NETA accreditation go well beyond initial commissioning. Regular maintenance testing, in line with NFPA 70B–2023 guidelines, helps detect potential issues early, ultimately extending the lifespan of electrical equipment. With updated regulations now requiring proper maintenance of electrical systems, this proactive approach has become indispensable.
This emphasis on quality is echoed by industry leaders. Ankur Trigunayat, VP Corporate at Inrush Electrical, shared:
"Being a NETA Accredited Company means our testing and commissioning practices meet the highest independently verified industry standards. For utilities, data centers, and industrial facilities, it provides confidence that safety, reliability, and accuracy are built into every test, every report, and every decision affecting critical electrical infrastructure."
As AI-driven data centers expand rapidly and the global shift toward electrification accelerates, the demand for specialized testing expertise has grown significantly. Construction firms should prioritize working with NETA‐accredited partners for acceptance testing, while recruiters need to focus on hiring professionals certified under the ANSI/NETA ETT–2026 standards, which will take effect on December 1, 2025. These experts are essential for ensuring that complex electrical systems function safely and efficiently from the outset.
Whether choosing a national provider like RESA Power or a specialized regional firm, selecting the right NETA‐accredited partner can directly impact project outcomes, system reliability, and long-term expenses. The firms featured in this 2026 list are trusted allies, capable of meeting the rigorous demands of today’s intricate projects.
To check if a company holds NETA accreditation, visit the "Find a NETA Accredited Company" page on the official NETA website. You can also confirm their accreditation status through NETA's verified resources. This guarantees the company complies with established standards for electrical testing and commissioning.
Acceptance Testing Service (ATS) is carried out during the commissioning phase of a new or upgraded electrical system. Its purpose is to verify that all components meet required standards and function properly before the system is fully operational. On the other hand, Maintenance Testing Service (MTS) happens regularly throughout the system's operational life. MTS helps maintain reliability, detect potential problems, and prevent failures. Simply put, ATS ensures the system is ready to start, while MTS keeps it running smoothly over time.
Mission-critical electrical systems need regular testing - typically once a year or as outlined by industry standards and manufacturers. This routine helps ensure they remain reliable and safe, even in the most demanding conditions.
