National Electric Coil

What National Electric Coil does

National Electric Coil (NEC) is a privately held U.S. specialist in the repair, retrofit, and overhaul of large high-voltage generators, serving power generation utilities, independent power producers, government agencies, and industrial cogenerators since 1917. The company designs and manufactures proprietary stator and rotor winding systems — including the NECCOBond-E (Class F VPI epoxy mica), NECCOPress I/II/III (resin-rich), NECCOFlex, and NECCOSeal product lines — as well as turbogenerator rotor windings, salient pole field windings, and exciter windings, supported by over 50 patents and 28,000+ pages of accumulated technical data on legacy OEM machines.

NEC operates two ISO 9001:2015-certified facilities: a 265,000 sq ft Columbus, Ohio headquarters and Rotating Equipment Service Center for turbogenerator and salient pole rotor windings, high-speed balancing (up to 4000 RPM and 200,000 lbs), and factory-based rotor/exciter repairs; and a Brownsville, Texas manufacturing facility for all stator winding types including inner-cooled Roebel bars for the largest turbogenerators. Combined infrastructure exceeds 400,000 sq ft with 10,000+ coils/bars annual throughput.

The business model is enterprise field sales with quote-based, custom-engineered pricing. Revenue is generated through on-site generator services (planned and emergency outage response, stator rewinds, core repairs, rotor refurbishments, inspections and testing) delivered by the Generator Services Group, factory-based work at the Rotating Equipment Service Center, custom winding manufacturing, technical seminars (jointly with HPC Technical Services), and a Data Banking service that locks in future replacement coil economics. The company employs 400+ staff, maintains 24/7 emergency response capability, and deploys globally through authorized Generator Service Partners. A 1995 management buyout from MagneTek reset the business exclusively around generators, and the company has remained privately held under management ownership since.

Name

National Electric Coil

Legal name

National Electric Coil

Website

https://national-electric-coil.com

Company type

Private

Founded year

1917

Operating status

Operating

Headcount range

501–1,000 employees

Short description

National Electric Coil is a privately held U.S. specialist in the repair, retrofit, and overhaul of large high-voltage turbogenerators and hydrogenerators, serving utilities, independent power producers, governments, and industrial cogenerators with proprietary winding systems and 24/7 field service since 1917.

Ownership category

akta.pro rank

Product category

Generator Manufacturing & Services

NAICS

Electrical Equipment Manufacturing (3353), Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Electronic Coils, Transformers & Other Inductors (3677), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Prime Mover Components & Auxiliary Systems (Controls, Excitation, Lubrication, Cooling, Intake/Exhaust) (IMAHAFAJ)

akta.pro secondary industry

High-Voltage Electrical Systems (Switchgear, Transformers, Protection & Control) (EUAEAFAA)

Keywords

• Generator repair services
• High-voltage stator windings
• Turbogenerator rotor windings
• Hydrogenerator refurbishment
• Vacuum pressure impregnation coils

Headquarters

HQ city

Columbus

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Generator Repair Services: On-site repair, retrofit, and overhaul services for turbogenerators, hydrogenerators, and rotating exciters. Includes emergency response, planned outages, inspections, testing, stator core repairs, and field installation services.
2. Winding Manufacturing: Manufacture of high-voltage stator coils and bars (VPI and resin-rich), rotor windings, field pole windings, and exciter windings. Custom engineered one-off manufacturing for specific machine requirements.
3. Training and Seminars: Week-long comprehensive advanced generator seminars conducted jointly with HPC Technical Services covering generator reliability, troubleshooting, and maintenance topics. Awards Continuing Education Units.
4. Data Banking Services: Stator Winding Data Banking Service for generator owners, measuring stator winding data for future coil manufacturing. Creates competitive bidding situation between OEM and NEC.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

National Electric Coil (NEC) manufactures high-voltage stator coils and bars (VPI and resin-rich), rotor windings, field pole windings, and exciter windings for turbogenerators and hydrogenerators. The company also delivers on-site generator repair, retrofit, and overhaul services through its Generator Services Group and factory-based repairs through the Rotating Equipment Service Center (RESC) in Columbus, Ohio. Operating from ISO 9001-certified facilities in Columbus, Ohio and Brownsville, Texas, NEC serves power generation utilities, independent power producers, industrial cogenerators, and government agencies worldwide with 24/7 emergency response.

Product overview

National Electric Coil offers a Total Generator Solution, providing a comprehensive portfolio of products and services for high-voltage generator maintenance, repair, and overhaul. The core product offerings center around proprietary stator winding systems including NECCOBond-E (VPI premium coils/bars), NECCOPress I/II/III (resin-rich coils), NECCOFlex (flexible VPI coils for small bore machines), and NECCOSeal (green coil system). Manufacturing includes stator windings, turbogenerator rotor windings, salient rotor pole windings, and exciter windings. Services span the full lifecycle through inspection and testing, engineering design, factory-based repairs at the Rotating Equipment Service Center, field services for on-site installations, and the G709 Generator Reliability Seminar for training. The company operates two ISO 9001:2015-certified manufacturing facilities in Columbus, Ohio (rotor windings) and Brownsville, Texas (stator windings), serving all OEM generator makes and models.

Differentiator

Problem solved

Functional benefit

Brands

• NEC Generator Services Group: Field service division for on-site generator installations and generator field work.
• Rotating Equipment Service Center (RESC)
• NECCOBond-E
• NECCOFlex
• NECCOPress
• Specialized Engineering Solutions (SESs)
• Technical Maintenance Memos (TMMs)

Products and services

• NECCOBond-E Premier VPI (Vacuum Pressure Impregnation) stator coil and bar design utilizing a proven Class F epoxy mica insulation system. Each coil is individually VPI'd for superior quality and long-term reliability, offering performance advantages over GVPI or resin-rich alternatives.
• NECCOPress I, II, III Hot-press resin-rich Class F insulation system available in three winding application types (I, II, III) for form-wound, diamond coil stators up to 11 kV, offering manufacturing and installation variations for cost-effective solutions on smaller industrial machines.
• NECCOFlex VPI multi-turn stator coils with specially-engineered flexibility at coil knuckles, designed for small bore two-pole generators and higher speed hydros to ease installation at the lap, exceeding flexibility requirements for proper installation.
• NECCOSeal Green Coil System, Class F insulation system designed for Global VPI Industrial Motor Applications.
• Turbogenerator Rotor Windings Manufacturing of turbogenerator rotor windings in copper or aluminum with direct or indirect cooling, available in square or edge-bent end turn corners. NEC can reverse engineer almost any machine design for rotor repairs and retrofits.
• Salient Rotor Pole Windings Field pole windings for salient pole rotors including new windings, refurbished windings, pole body repairs, and pole key assemblies. NEC has refurbished nearly 2,000 field poles in a recent 10-year period.
• Exciter Windings Replacement armature coils for rotating exciters (brushless and with brushes), including complete refurbishment and rewind services for hydrogen-cooled exciters.
• Generator Field Services On-site generator installation, field services, and outage support including stator rewinds, core repairs, stator core restacks, and winding installations performed by NEC's Generator Services Group with 24/7 emergency response availability.
• Rotating Equipment Service Center (RESC) Factory-based rotor and exciter repairs, refurbishments, and dynamic balancing at NEC's Columbus, Ohio facility, with high-speed balancing pit capable of balancing rotors up to 200,000 pounds at speeds up to 4000 RPM.
• Inspection & Testing Services Generator inspections and testing services including failure mode analysis, core tests (Core Loop, EL Cid), electrical testing, and troubleshooting for planned and unplanned outages.
• G709 Generator Reliability Seminar Week-long comprehensive advanced generator seminar developed jointly with HPC Technical Services, covering reliability improvements and troubleshooting for plant managers, engineers, and technical staff. Awards Continuing Education Units.

Quantifiable outcome

• High-speed balancing to peak values of no more than 1 mil - industry leading performance
• +2 more outcomes

Named customers3 records

Segments3 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Three partnerships are on record, tiered core and minor.

• HPC Technical ServicescoreStrategic or Co-development PartnerJoint partnership conducting week-long comprehensive advanced generator seminars (G709) covering reliability improvements and troubleshooting. 16 technical presenters with 20+ years experience from both organizations. Seminar awards Continuing Education Units and covers topics on machine design, stator and rotor maintenance, asset management, and failure modes.
• International Generator Technical Community (IGTC)coreStrategic or Co-development PartnerNEC is the founding member and sponsor of the IGTC, an online engineering technical discussion forum serving the worldwide generator community. NEC contributes funding and expertise as a gift to the worldwide engineering community. Access to IGTC Resource Center with Generator Evaluation Memos and other generator-oriented information.
• Generator Service Partners (GSPs)minorChannel Partner/ Reseller/ DistributorAuthorized Generator Service Partners assist with on-site installation of stator windings, stator cores and hydro field pole windings. Installation by GSPs ensures windings will perform as designed.

Scale indicators8 records

Recent moves7 records

Expansion highlights4 records

Broad incumbents

• Mitsubishi Power: Mitsubishi Power is an OEM of large utility-scale steam and gas turbine generators with an established service arm. Competes with NEC for service contracts on Mitsubishi and non-Mitsubishi generators in utility and IPP segments.
• Voith Hydro: Voith Hydro is a major hydro turbine and generator OEM with a substantial service and modernization business competing with NEC on hydrogenerator refurbishments. Comparable in customer base (utilities, IPPs) and on-site field service delivery, though broader as part of Voith's full turbine-generator portfolio.
• Hitachi Energy: Hitachi Energy (formerly ABB Power Grids) services generators and transformers for utilities and industrial customers. Overlaps with NEC on generator field services and rotating equipment repair, particularly in legacy ABB-installed generator fleets.
• GE Vernova: GE Vernova's Power segment services large steam and gas turbine generators globally with its own installed-base service organization. Comparable in customer segment (utilities, IPPs) and service offering (rewinds, overhauls) but with broader portfolio and OEM advantages.
• Siemens Energy: Siemens Energy is a major OEM of large turbogenerators and hydrogenerators with a substantial aftermarket service organization. Competes with NEC on rewinds, retrofits, and field services but with the structural advantage of original design data and LTSA-captured customer relationships.

Direct peers

• Sulzer: Sulzer provides independent rotating equipment services including generator and motor rewinds, high-speed balancing, and field services for power generation. Directly comparable as an independent aftermarket specialist competing with NEC on stator/rotor winding refurbishment and on-site outage support.
• PSM (Power Systems Mfg.): Power Systems Manufacturing is an independent manufacturer of generator coils, bars, and windings serving utility and industrial customers. Closely comparable as an independent non-OEM winding manufacturer competing head-to-head with NEC's NECCOBond-E and NECCOPress product lines.
• ANDRITZ: ANDRITZ's Hydro division refurbishes and rewinds large hydrogenerators globally and is a direct competitor to NEC's salient pole field winding and hydrogenerator stator coil services. Comparable scope on winding manufacturing and on-site installation.

Regional players

• Trench Group: Trench Group manufactures specialized generator and transformer components (e.g., insulation systems, neutral grounding equipment) serving utilities and OEMs. Comparable as a component manufacturer for power generation equipment with overlapping electrical engineering expertise.

Emerging players

• Iris Power: Iris Power specializes in partial discharge testing and monitoring for stator windings of large motors and generators. Partial overlap with NEC's inspection and testing services and shares the same end-customers (utilities, IPPs, industrial cogenerators).

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/national-electric-coil

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

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 National Electric Coil