Marmon Utility LLC

What Marmon Utility LLC does

Marmon Utility LLC is a U.S.-based manufacturer of overhead and underground power cable systems serving electric utilities globally. Operating under the heritage Hendrix and Kerite brands through three manufacturing facilities in Seymour, CT; Milford, NH; and Amherst, NH, the company addresses the reliability, storm hardening, and wildfire mitigation needs of investor-owned utilities, public power utilities, electric cooperatives, and renewable energy developers. A subsidiary of Marmon Group, which is owned by Berkshire Hathaway, Marmon Utility combines more than 75 years of institutional history with the financial backing of one of the world's largest conglomerates, and ships product to all 50 U.S. states and all seven continents.

The product portfolio spans spacer cable systems, tree wire, covered tap/tie/ground wire, and polymer insulators — including Fire Retardant (UL 94 V-0 certified) and High Temperature (rated to 200°C continuous conductor temperature) variants — for overhead applications; and medium voltage (5kV-35kV) Hendrix TRXLPE and Kerite EPR cables, high voltage (69kV-138kV) cables, and Cable-in-Conduit (CIC) for underground applications. Technical differentiation rests on proprietary high-density polyethylene (HDPE) insulator blends, the Kerite Permashield extruded stress control layer, and the 2024 launch of Hendrix ImpactAlert, a real-time impact detection monitoring system powered by Atomation. The Cable-in-Conduit line carries an unmatched 40-year warranty, and leadership across the firm collectively holds 17 U.S. patents signaling sustained R&D investment in utility-grade cable and molded accessory design.

Revenue is generated through hardware sales of cable systems and components, complemented by turnkey engineering and installation services offered through Kerite Cable Services. Pricing is project-specific under multi-year contracts, with bundled one-price aerial cable system packages available to provide budget certainty for utility customers. Distribution combines a dedicated sales representative network covering all 50 U.S. states and international markets, an inside-sales and quote request workflow, an e-commerce platform (CableProspector.com), and active participation in industry tradeshows, webinars, and a technical content library. Documented customer outcomes include a 67% reduction in sustained outages and a 42% reduction in momentary outages for utilities deploying Hendrix Spacer Cable systems, and the company's covered conductor technology was validated by Southern California Edison as delivering the highest mitigation-to-cost ratio among three fire risk reduction options evaluated in 2019.

Name

Marmon Utility LLC

Legal name

Marmon Utility LLC

Website

https://marmonutility.com

Company type

Private

Founded year

2010

Operating status

Operating

Headcount range

101–250 employees

Short description

Marmon Utility LLC, a Berkshire Hathaway subsidiary operating under the Hendrix and Kerite brands, manufactures overhead and underground power cable systems for electric utilities globally, with three U.S. production facilities serving wildfire mitigation, storm hardening, and grid reliability applications.

Ownership category

akta.pro rank

Product category

Power Cable Systems for Electric Utilities

NAICS

Communication and Energy Wire and Cable Manufacturing (33592), Power and Communication Line and Related Structures Construction (237130)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600), Electrical Industrial Apparatus (3620), Electronic Connectors (3678)

akta.pro primary industry

Utility & Underground Distribution Cable (URD/Substation) (IMADAMAG)

akta.pro secondary industries

Power Cables & Conductors (LV/MV cables, flexible cables, bus wire, armored cable) (IMAGAEAC), Underground Power Cables (MV/HV/EHV, XLPE, PILC, subsea/land) (EUADADAB), Low-Voltage Switchboards & Panelboards (LV distribution panels, MCCs, switchboards) (IMAGAEAA), Underground transmission & distribution cable EPC (civil + cable install) (EUADAKAB)

Keywords

• Power cable systems
• Polymer insulators
• Underground power cables
• Cable installation services
• Electrical grid solutions

Headquarters

HQ city

Milford

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Power Cable and Hardware Product Sales: Marmon Utility generates revenue through the manufacture and sale of overhead and underground power cable systems, including spacer cable, tree wire, covered conductors, insulators, medium voltage cables, high voltage cables, and associated hardware and accessories. Products are sold project-based to utilities, with pricing determined by project quotes, cable specifications, and volume. The company also offers turnkey engineering and installation services through Kerite Cable Services, adding professional services revenue to the product sales model.
2. Engineering and Installation Services: Kerite Cable Services offers turnkey engineering and installation packages providing a single-source solution for cable challenges. The Aerial Cable Systems one-price system bundles circuit materials, design/review, and field support/final inspection under a single price. These services are offered alongside product sales as an add-on or standalone offering.

Pricing tiers

Go-to-market motion4 records

Distribution channels4 records

Marketing channels6 records

Core offering

Marmon Utility designs, manufactures, and supplies overhead and underground power cable systems for electric utilities under the Hendrix and Kerite brands, including spacer cable, tree wire, covered conductors, polymer HDPE insulators, medium-voltage (5kV–35kV) and high-voltage (69kV–138kV) underground cables, Cable-in-Conduit, and the ImpactAlert real-time impact-detection monitoring system. Through Kerite Cable Services it also delivers turnkey engineering, design, and installation support as a single-source package.

Product overview

Marmon Utility LLC, operating under the Hendrix and Kerite brands, offers a comprehensive portfolio of overhead and underground power cable solutions for electric utilities. The overhead portfolio includes Spacer Cable Systems, Tree Wire, Covered Tap/Tie/Ground Wire, and Polymer Insulators/Accessories (including Fire Retardant and High Temperature variants). The underground portfolio includes Medium Voltage Cables (TRXLPE and EPR conductors from 5kV-35kV), High Voltage Cables (69kV-138kV), Cable-in-Conduit solutions, and Kerite Cable Services for turnkey installation. A notable add-on module is ImpactAlert, a real-time impact detection monitoring system. All products are backed by Berkshire Hathaway ownership and the company's Rapid Cycle Time program for industry-leading lead times.

Differentiator

Problem solved

Functional benefit

Brands

• Hendrix: Power cable and spacer cable systems brand offering overhead solutions including spacer cable, tree wire, tap/tie/ground wire, and molded products
• Kerite
• ImpactAlert

Products and services

• Hendrix Spacer Cable System Aerial covered cable system comprising messenger wire, covered conductors, and polyethylene spacers engineered for storm hardening, outage prevention, vegetation management, wildlife fault reduction, and right-of-way reduction for electric utility overhead distribution.
• Hendrix Tree Wire Covered open wire supported on polyethylene insulators, designed for reliability and performance in treed environments where vegetation contact is a primary outage cause.
• Covered Tap, Tie, and Ground Wire Tap wire application providing the benefits of a covered cable system to jumper and tap wire connections in overhead electrical distribution.
• Polymer Insulators and Molded Accessories High-density polyethylene (HDPE) insulators and molded accessories including tie-top, vise-top, line post, clamp-top, trunnion, and station post insulators that are stronger, lighter, and more impact-resistant than porcelain.
• Fire Retardant (FR) Insulators Fire retardant HDPE insulators that self-extinguish after heat source removal, tested to UL 94 V-0 (the most stringent rating), designed to reduce wildfire ignition risk in high fire-threat utility corridors.
• High Temperature (HT) Insulators Specialized HDPE blend insulators allowing operation at a maximum continuous conductor temperature of up to 200°C depending on mechanical load, for high-heat overhead systems.
• Medium Voltage Underground Cables (Hendrix TRXLPE and Kerite EPR) Underground power cables including Hendrix TRXLPE Conductor (15kV–35kV) and Kerite EPR Conductor (5kV–35kV) engineered for reliability in demanding medium-voltage underground distribution applications.
• High Voltage Underground Cables High voltage underground power cables rated 69kV to 138kV for transmission-level underground power distribution.
• Cable-in-Conduit (CIC) Pre-installed underground cable solution offering up to 60% lower installation costs than pull-through methods, backed by an unmatched 40-year warranty.
• Kerite Cable Services Turnkey engineering and installation package providing a single-source solution for underground cable challenges, including project management, design/review, and field support/final inspection.
• Hendrix ImpactAlert (Powered by Atomation) Real-time impact detection and monitoring solution for overhead power lines that detects line disturbance events (vehicle collisions, extreme weather, falling debris) and alerts utilities to enable rapid response and reliability analysis.

Quantifiable outcome

• 67% reduction in sustained outages and 42% reduction in momentary outages for utilities using Hendrix Spacer Cable systems
• +4 more outcomes

Named customers3 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability1 record

Feature11 records

Partnerships

One partnership is on record.

• Reliaguard (Reliaguard®)minorStrategic or Co-development PartnerHendrix Molded Products announced a partnership with Reliaguard® for wildfire mitigation and grid hardening solutions, combining Hendrix insulators and accessories with Reliaguard products to provide integrated wildfire risk reduction for utilities.

Scale indicators8 records

Recent moves6 records

Expansion highlights7 records

Direct peers

• Prysmian Group: Largest global cable manufacturer offering medium and high voltage underground cables, overhead conductors, and accessories for utilities. Prysmian's 2018 acquisition of General Cable made it the most direct global competitor to Marmon Utility's Kerite underground and Hendrix overhead product portfolios.
• Southwire Company: One of the largest U.S. wire and cable manufacturers with significant utility exposure across medium/high voltage underground and overhead products. Southwire's manufacturing scale and broad distribution overlap directly with Marmon Utility's domestic utility customer base.
• Nexans: Global cable manufacturer with a substantial utility division offering medium and high voltage underground cables, overhead conductors, and accessories. Nexans competes with Marmon Utility on both utility tenders and grid hardening programs across North America and internationally.
• Okonite Company: U.S.-based specialty manufacturer of medium and high voltage underground power cables for utilities. Okonite's product portfolio (5kV–138kV EPR and XLPE cables) directly overlaps with Marmon Utility's Kerite underground cable line and serves similar investor-owned utility and co-op customers.
• Service Wire: U.S. specialty wire and cable manufacturer serving utility, commercial, and industrial markets with overhead and underground power cable products. Service Wire competes with Marmon Utility for distribution utility orders and shares a similar U.S. manufacturing-based value proposition.

Broad incumbents

• Hubbell Incorporated: Diversified electrical products manufacturer with utility solutions including insulators, connectors, and overhead hardware. Hubbell's electrical group competes with Marmon Utility's molded products line (HDPE insulators, polymer accessories) across the same utility specifier and procurement relationships.
• AFL (Fujikura): Subsidiary of Fujikura Ltd. manufacturing fiber optic cable, copper cable, and overhead conductors including covered conductors for utilities. AFL's overhead conductor product lines overlap with Marmon Utility's tree wire and spacer cable offerings, particularly in storm hardening applications.
• Sumitomo Electric: Global manufacturer of power cables, overhead conductors, and utility grid components with significant North American utility sales. Sumitomo's high voltage underground cable and overhead transmission product lines compete with Marmon Utility on larger transmission and distribution tenders.

Regional players

• Quanta Services: Largest U.S. utility infrastructure construction contractor executing T&D and grid hardening projects. While Quanta is a contractor rather than a manufacturer, it is a key downstream buyer of underground and overhead cable products and competes indirectly with Marmon Utility's Kerite Cable Services turnkey installation offering.

Emerging players

• Reliaguard: Niche provider of wildlife mitigation covers, bird diverters, and line protection products for utility distribution and transmission systems. Reliaguard is both a co-development partner with Marmon Utility's Hendrix brand and a complementary product supplier competing for wildfire mitigation budget allocations.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/playlist?list=PLlcpp_2R7Crk4WeRJWzJ9S0IKacxJ35WM
• LinkedInlinkedin.com/company/marmon-utility-llc

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 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 Marmon Utility LLC