Transformer Maintenance and Service

What Transformer Maintenance and Service does

Transformer Maintenance and Service, Inc. (TMS) is a family-owned utility equipment services company founded in 1978 in Smithfield, North Carolina, and currently headquartered in Newton Grove, NC. It provides maintenance, repair, testing, and recovery services for transformers, voltage regulators, circuit reclosers, relays, meters, and substation equipment to electric utility customers across 13 U.S. states (NC, SC, VA, TN, PA, MD, DE, FL, GA, KY, OH, IN, AL). Operations are delivered through a 20,000-square-foot shop in Newton Grove, NC capable of handling transformers up to 15 MVA, a second regional facility in Mooresburg, TN (formerly Ross Meter Service, acquired 2011), and mobile repair units that perform on-site emergency and preventive field services. The company employs approximately 115 full-time personnel and holds status as the oldest Cooper Authorized Service Center in the World through its Tennessee Division. In April 2026, TMS was acquired by Trantech Radiator Topco, LLC in a transaction supported by a $26 million follow-on investment from Main Street Capital Corporation and MSC Income Fund.

TMS generates revenue through six distinct streams: (1) shop-based transformer repair at company facilities; (2) on-site field services including inspection, painting, infrared testing, and OHM testing; (3) substation maintenance and commissioning; (4) transformer investment recovery (purchase and resale of surplus equipment); (5) wood pole inspection and treatment; and (6) relay and meter testing services through the Ross Maintenance & Service subsidiary. Pricing is quote-based across all services with no publicly disclosed rates, and billing is pay-as-you-go per engagement. Go-to-market is executed through dedicated Utility Representatives conducting direct field sales to electric utility customers, supplemented by an inside sales team organized into four regional territories. Customer relationships are described as long-tenured and personal, with services positioned around regulatory compliance (ANSI and IEEE standards) and emergency response capability.

Name

Transformer Maintenance and Service

Legal name

Transformer Maintenance and Service, Inc.

Website

https://transmaint.com

Company type

Private

Founded year

1978

Operating status

Acquired

Headcount range

11–50 employees

Ownership category

akta.pro rank

Product category

Utility Equipment Maintenance Services

NAICS

Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance (8113)

SIC

Services-Miscellaneous Repair Services (7600)

akta.pro primary industry

T&D maintenance, refurbishment & uprating services (reconductoring, life extension) (EUADAKAH)

akta.pro secondary industries

Testing, Commissioning, Maintenance & Retrofit/Modernization (Substations/Switchgear) (EUADACAL), Testing, Commissioning & Energization Services (T&C) (IMAFAHAK)

Keywords

• Transformer repair services
• Utility equipment maintenance
• Substation field services
• Voltage regulator repair
• Electrical equipment testing

Headquarters

HQ city

Newton Grove

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Transformer Repair and Maintenance Services: Shop-based repair services for transformers performed at company facilities in Newton Grove, NC and Mooresburg, TN
2. Field Services: On-site maintenance, inspection, painting, infrared testing, OHM testing, and emergency repairs performed at customer job sites
3. Substation Maintenance:
4. Investment Recovery: Purchase and resale of surplus transformers, regulators, reclosers and other utility equipment
5. Wood Pole Inspection/Treatment: Field inspection and treatment services for utility wood poles
6. Relay and Meter Testing Services: Testing and repair services for electrical relays and meters through Ross Maintenance & Service subsidiary

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels3 records

Core offering

Transformer Maintenance and Service (TMS) is a utility equipment service company that repairs, maintains, and tests transformers, voltage regulators, circuit reclosers, and substation equipment for electric utility customers. Services are delivered through shop-based repairs at facilities in Newton Grove, NC and Mooresburg, TN, and through on-site field services deployed via Mobile Repair Units, bucket trucks, and line trucks across 13 U.S. states. The company also operates a Transformer Investment Recovery program for surplus equipment resale.

Product overview

Transformer Maintenance and Service, Inc. (TMS) is a family-owned utility equipment service company founded in 1978, offering comprehensive transformer maintenance and repair services across 13 states. The company operates from two facilities in Newton Grove, NC (20,000 sq ft) and Mooresburg, TN, employing approximately 115 full-time personnel. Services include shop-based transformer repair (up to 15 MVA), on-site field services via Mobile Repair Unit, regulator and recloser repairs, substation maintenance, street light restoration, and transformer investment recovery for surplus equipment. The portfolio also includes relay and meter testing services through the acquired Ross Maintenance & Service entity (oldest Cooper Authorized Service Center in the World), and EPA-compliant oil testing.

Differentiator

Problem solved

Functional benefit

Products and services

• Transformer Repair Services In-shop transformer repair services ensuring equipment meets ANSI and IEEE standards. Handles transformers up to 15 MVA capacity at the 20,000 square-foot Newton Grove, NC facility. Targeted at electric utility companies.
• Field Services On-site services including inspecting, painting units, infrared testing, and OHM testing performed at customer job sites using bucket trucks and line trucks. Targeted at electric utility customers across 13 states.
• Mobile Repair Unit (MRU) Services Emergency and non-emergency on-site transformer repairs at customer job sites, enabling immediate repairs and cosmetic improvements without shop transport. Targeted at electric utilities needing rapid response.
• Regulator and Recloser Repair Shop and field repair services for voltage regulators and circuit reclosers, including substation maintenance with retro-filling transformers and breaker repairs. Targeted at electric utility distribution operators.
• Substation Maintenance Substation equipment servicing including tap changers on power transformers, circuit breakers, and commissioning of new substations. Targeted at electric utilities operating transmission and distribution substations.
• Street Light Restoration Street light restoration services utilizing 4 bucket trucks for utility pole maintenance and repairs. Targeted at electric utilities and municipalities.
• Wood Pole Inspection and Treatment Services Wood pole inspection and treatment services for utility wood poles, expanding field service capabilities. Targeted at electric utility distribution operators.
• Transformer Investment Recovery Surplus equipment recovery and resale operation handling transformers, regulators, reclosers, and other equipment with competitive pricing. Targeted at electric utilities disposing of end-of-life or surplus equipment.
• Relay and Meter Testing Services Testing and repairing relays and meters through the Ross Maintenance & Service subsidiary, the oldest Cooper Authorized Service Center in the World. Includes field work testing relays in substations. Targeted at electric utility customers.
• Oil Testing Services E.P.A.-compliant transformer oil testing and analysis services. Targeted at electric utilities requiring environmental compliance and transformer health diagnostics.

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators4 records

Recent moves14 records

Expansion highlights4 records

Direct peers

• ERMCO (Electric Research and Manufacturing Cooperative): ERMCO manufactures distribution transformers and provides remanufactured and repaired transformers plus field services for utilities. It is a comparable supply-and-service peer with utility customer overlap.
• Custom Built Services (CBS Field Services): CBS Field Services delivers transformer and substation field services, including retrofill, testing, and on-site repair for electric utilities. Its mobile service model and utility focus directly parallel TMS's field services offering.
• RESA Power: RESA Power provides transformer life-extension services, field services, and remanufacturing for utility and industrial customers across North America. It is the most direct scaled peer to TMS, with overlapping shop repair, field service, and retrofill capabilities.
• Shermco Industries: Shermco Industries offers electrical testing, maintenance, and repair services for utilities and industrial customers, including transformer and switchgear services. Its field-service-heavy model and utility customer base closely mirror TMS's go-to-market.
• Quality Switchgear: Quality Switchgear services, remanufactures, and repairs low- and medium-voltage switchgear and related substation equipment for utility and industrial customers. It overlaps with TMS's regulator, recloser, and substation maintenance work.
• ELSCO Transformers: ELSCO Transformers remanufactures and repairs medium-voltage distribution transformers and offers related field services to electric utilities. It competes head-to-head with TMS in shop-based transformer repair and utility account coverage.

Broad incumbents

• Eaton: Eaton is a large diversified electrical equipment manufacturer and service provider, including transformer, switchgear, and power system services for utilities. It is a broad incumbent whose service arm overlaps with TMS but operates at much greater scale and across many product lines.
• Howard Industries: Howard Industries is a large US-based transformer manufacturer that also offers field service and support for utility customers. It competes more broadly across new equipment supply and OEM-direct service rather than TMS's independent repair niche.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Transformer Maintenance and Service