T&R Electric Supply Co

What T&R Electric Supply Co does

T&R Electric Supply Co., Inc. is a family-owned, private industrial remanufacturer founded in 1961 in Colman, South Dakota, and is the largest supplier of remanufactured transformers in the United States. The company buys used power and distribution transformers (an average of 26,000 units annually), disassembles, rewinds with 100% copper, and reconditions them for resale at 20-40% discounts versus new equipment, with capacities up to 138,000 volts and 30 MVA on the power side and up to 10,000 KVA (three-phase) / 500 KVA (single-phase) on the distribution side. Operations are anchored by 221,000+ square feet of manufacturing on 61 acres, including a 40,000+ square foot substation shop, with approximately 42,000 transformers in stock at any time and a throughput of 16-20 truckloads shipped per week.

The revenue model spans six streams: remanufactured transformer sales, rewinding and repair services, an in-house oil testing laboratory (approximately 32,000 samples per year), certified Siemens voltage regulator service, used-equipment investment recovery (the largest used PCB-free equipment purchaser in the U.S.), and new equipment resale via multi-OEM partnerships (GE-Prolec, Cooper Power, Siemens, S&C, Central Moloney, Ermco, Balteau Standard, Olsun, Westinghouse, Federal Pacific, VanTran, Magnetic Technologies). Go-to-market combines direct field sales to utilities and industrial buyers, inside sales via a 1-800 number and online quote cart, plus an emergency response service capable of delivering replacement units within 24 hours.

T&R primarily serves U.S. municipalities, rural electric associations (REAs), investor-owned utilities (including Duke Energy on a ~30-year relationship), and commercial/industrial customers across all 50 states with documented international shipments. The value proposition rests on the combination of large standing inventory, fast emergency response, remanufactured cost savings, and warranty coverage of up to 36 months on rewound units — capabilities that have produced multi-decade customer retention and 35 employees with 25+ years of tenure.

Name

T&R Electric Supply Co

Legal name

T&R Electric Supply Co., Inc.

Website

https://t-r.com

Company type

Private

Founded year

1961

Operating status

Operating

Headcount range

51–100 employees

Short description

T&R Electric Supply Co. is a family-owned U.S. industrial remanufacturer, founded in 1961 and based in Colman, South Dakota, that buys, rewinds with 100% copper, and resells power and distribution transformers at 20-40% savings versus new units. It serves municipalities, REAs, investor-owned utilities, and commercial/industrial customers across all 50 states.

Ownership category

akta.pro rank

Product category

Power Transformers and Electrical Distribution Equipment

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance (8113), Relay and Industrial Control Manufacturing (335314), Electronic and Precision Equipment Repair and Maintenance (811210)

SIC

Power, Distribution & Specialty Transformers (3612), Switchgear & Switchboard Apparatus (3613), Electronic Coils, Transformers & Other Inductors (3677), Services-Miscellaneous Repair Services (7600)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

akta.pro secondary industries

Reactive Power & Power Quality Equipment (Capacitor Banks, Reactors, STATCOM/SVC, Harmonic Filters) (IMAGAAAG), Power Transformers, Reactors & Auxiliary Power Systems (EUADACAJ), Repair, Refurbishment & Remanufacturing Services (EUAIANAB), Medium-Voltage Distribution Components (MV breakers, disconnects, reclosers, MV terminations & joints) (IMAGAEAL)

Keywords

• Remanufactured transformers
• Power distribution equipment
• Transformer rewinding services
• High voltage apparatus
• Switchgear manufacturing

Headquarters

HQ city

Colman

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Infrastructure, Personnel, Operations, Marketing or Sales

Revenue model

1. Remanufactured Transformer Sales: Sale of remanufactured/reconditioned transformers including single phase, three phase, and substation transformers. Transformers are restored to like-new condition with full testing and up to 36-month warranty.
2. Rewinding and Repair Services: Rewinding and repair services for power and distribution transformers using 100% copper. Includes evaluation, disassembly, winding, and full reconditioning.
3. Laboratory Testing Services: Oil testing and analysis services including PCB analysis, oil screening, and Dissolved Gas Analysis. Lab processes approximately 32,000 samples per year.
4. Voltage Regulator Services: Certified regional service center for Siemens voltage regulators, offering repair estimates, complete servicing, parts inventory, and control panel upgrades.
5. Investment Recovery/Equipment Purchase: Purchase of used surplus transformers and switchgear. Company is the largest purchaser of used PCB-free equipment in the nation, buying 16-20 truckloads per week.
6. New Material Sales: Sale of new transformer and electrical equipment from manufacturer partners including distribution transformers, dry types, regulators, reclosers, and circuit breakers.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

T&R Electric Supply Co. remanufactures, rewinds, and sells transformers (single phase, three phase, substation, dry type, and voltage regulators) and related high-voltage apparatus (switchgear, reclosers, circuit breakers). The company operates from a 221,000+ square foot facility in Colman, South Dakota, maintaining roughly 40,000 transformers in inventory and shipping 16-20 truckloads per week. It complements equipment sales with rewinding services, oil testing laboratory services, investment recovery/surplus purchase, and emergency response deployment.

Product overview

T&R Electric Supply Co is the largest supplier of remanufactured transformers in the United States, founded in 1961. The company offers a comprehensive portfolio centered on transformer products: single phase transformers (3-500 KVA, up to 35 kV), three phase transformers for power grid applications, and substation transformers (up to 30 MVA, 138 kV). The core offerings include rewound transformers with 100% copper windings and a 36-month warranty, switchgear systems, voltage regulators (with Siemens certification), and dry type transformers up to 5 MVA. The company provides approximately 40,000 transformers in inventory at any given time across categories including pole mount, pad mount, station, and regulator types. Supporting services include lab testing (32,000 samples annually), investment recovery (purchasing 26,000 units/year), and custom rebuilding capabilities for units up to 138,000 volts and 30 MVA capacity. New materials are also offered through partnerships with major manufacturers including Siemens, GE-Prolec, and Cooper Power.

Differentiator

Problem solved

Functional benefit

Products and services

• Single Phase Transformers Remanufactured single phase pole mount and pad mount transformers ranging from 3 KVA up to 500 KVA with voltage class ratings up to 35 kV, used for converting power line currents to suitable levels for residential or light commercial distribution.
• Three Phase Transformers Three phase remanufactured transformers for electric power grids and industrial power systems, enabling efficient electrical power transmission over extensive distances. T&R buys, sells, and stocks over 1,600 units annually.
• Substation Transformers Single and three phase remanufactured substation transformers with up to 30 MVA base capacity and voltage ratings up to 138 kV, available in circular disc, helical, and layer winding configurations with 100% copper materials.
• Rewound Transformers Power and distribution transformer rewinding service using 100% copper windings and all new insulation, three phase up to 10,000 KVA and single phase up to 500 KVA, supported by a 36-month warranty.
• Switchgear Complete switchgear systems and replacement components including lightning arrestors, fuses, circuit breakers, disconnect switches, reclosers, and metal-clad lineups for new installations or matching existing applications.
• Voltage Regulators New and rebuilt voltage regulators with complete reconditioning services including contact inspection, motor capacitor changes, and control voltage testing. T&R is a certified regional service center for Siemens Energy & Automation regulators.
• Dry Type Transformers Single phase and three phase new and reconditioned dry type transformers up to 5 MVA, including core and coil replacements and indoor/outdoor applications with custom retrofitting and fabrication.
• New Material Sales New electrical equipment including distribution and substation transformers, dry type transformers, enclosures, voltage regulators, substations, reclosers, and circuit breakers sourced from manufacturers including Siemens, GE-Prolec, Cooper Power, Balteau Standard, Ermco, Central Moloney, Olsun Electric, S&C, Westinghouse, Federal Pacific, VanTran Industries, and Magnetic Technologies Corp.
• Surplus Equipment Purchase Purchase service for used PCB-free transformers and switchgear, including polemounts, padmounts, substations, regulators, and other equipment; T&R is the largest purchaser of used PCB-free equipment in the nation.
• Lab Services Laboratory testing services including PCB testing, oil screening, and dissolved gas analysis, performed under ASTM methods with quality control procedures on approximately 32,000 samples annually.
• Investment Recovery Investment recovery services for handling and decommissioning transformers, including purchase of 26,000 units per year and recycling of nearly 13,000 transformers, reducing customer environmental risk and liability exposure.

Quantifiable outcome

• 20-40% cost savings compared to new transformer purchases
• +5 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Three partnerships are on record, tiered core, minor and supporting.

• Siemens Energy and AutomationcoreStrategic or Co-development PartnerT&R Electric is a certified regional service center for Siemens Energy & Automation voltage regulators, offering repair estimates, complete servicing, parts inventory, and control panel upgrades. This is a significant certification that validates T&R's technical capabilities.
• Investment Recovery AssociationminorOthersT&R Electric is a proud member of the Investment Recovery Association. Environmental audits are welcomed and encouraged as part of their investment recovery services.
• New Material VendorssupportingChannel Partner/ Reseller/ DistributorT&R has developed strong relationships with top manufacturers in the industry for new material sales including Balteau Standard, Ermco, Central Moloney, Olsun Electric, GE-Prolec, S&C, Cooper Power, Westinghouse, Federal Pacific, VanTran Industries, and Magnetic Technologies Corp.

Scale indicators12 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Southwest Electric Co: Southwest Electric Co is a US-based remanufacturer and rebuilder of transformers and electrical apparatus serving utilities and industrial customers. It is the closest direct competitor to T&R's core remanufacturing business model.
• Niagara Transformer Corp: Niagara Transformer remanufactures and rebuilds power and distribution transformers for utility and industrial customers. Overlapping product scope, customer base, and remanufacturing approach make it a directly comparable competitor.
• Jefferson Electric: Jefferson Electric manufactures and remanufactures dry-type and liquid-filled transformers for commercial, industrial, and utility customers. Comparable product portfolio and focus on distribution-class transformers.
• Howard Industries: Howard Industries is one of the largest US manufacturers of distribution transformers and power quality products. Overlaps with T&R in distribution transformer supply to utilities, though Howard is primarily a new-equipment OEM.
• ERMCO (Electric Research and Manufacturing Cooperative): ERMCO is a major US manufacturer of distribution transformers serving electric cooperatives and utilities, and is also listed as a T&R supplier partner. Direct overlap in distribution transformer supply and shared cooperative-utility customer base.
• Waukesha Electric Systems: Waukesha Electric Systems manufactures large power transformers for utility substations and industrial applications. Comparable high-voltage transformer capability (up to T&R's 138kV/30 MVA range) and utility customer base.

Broad incumbents

• Hitachi Energy: Hitachi Energy is a global leader in power and distribution transformer manufacturing and grid solutions. As a broad incumbent, it competes with T&R in large transformer supply while offering a much wider portfolio across the grid value chain.
• Siemens Energy: Siemens Energy manufactures new transformers and grid equipment globally and is also a T&R partner (Siemens-certified regional service center for voltage regulators). A broad incumbent serving overlapping utility customers across new equipment, services, and digital grid.
• Eaton: Eaton is a broad electrical equipment manufacturer with significant presence in transformers, switchgear, and power distribution components. Competes with T&R across multiple product categories while serving a wider industrial and utility customer base.
• ABB: ABB is a global broad incumbent in electrification and transformer manufacturing, offering new power and distribution transformers at scale. Competes with T&R for large utility transformer orders and adjacent grid equipment.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/trelectricsupply
• Xx.com/t_r_electric

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 T&R Electric Supply Co