Axiom Energy Group

What Axiom Energy Group does

Axiom Energy Group is a privately held clean energy equipment manufacturer headquartered in East Troy, Wisconsin, operating from a 70,000 square foot Midwest manufacturing facility. The company designs, manufactures, and sells distributed power generation systems anchored by its proprietary Marathon Engine, a long-life engine technology originally developed in 1998 and rated for approximately 40,000 hours of continuous operation. Its core product, the EcoPrime microCHP system, simultaneously produces thermal energy (13,000-47,000 BTU/hr) and electricity (1.2-4.4 kW) from a single fuel source at system efficiencies exceeding 90%, with potential carbon emissions reductions of approximately 30% versus traditional grid-plus-boiler setups. The company also sells the EnduraGen Generator for prime and remote power applications, custom power solutions leveraging the Marathon Engine, and vapor recovery systems.

The company sells hardware directly to end customers through an enterprise field sales motion targeting commercial property owners and facility managers with continuous thermal demand, including hotels, restaurants, senior living facilities, multifamily residential properties, car washes, and other commercial buildings. Revenue is generated through unit hardware sales with quote-based pricing; industry context places typical microCHP units in the $10,000-$30,000 range depending on capacity. Notable named customers include Bantr Hotel, Zesti restaurant, Tennyson Senior Living, Lincoln Crest multifamily, and a car-wash operator. Marketing is content-driven, with technical blog posts, sizing guides, case studies, a YouTube channel, and the Energy Drive podcast supporting a product-led growth motion alongside direct sales.

Founded in 1998 as Marathon Engine Systems and rebranded in 2020 as Axiom Energy Group, the company is led by founder and President & CEO James C. Green. It operates with a small team (1-10 employees), has not raised external funding, and distributes its products domestically within the United States. The intellectual property center of gravity sits in the proprietary Marathon Engine, which underpins each product line and is treated as the company's principal competitive differentiator.

Name

Axiom Energy Group

Legal name

Axiom Energy Group

Website

https://axiom-energy.com

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

1–10 employees

Short description

Axiom Energy Group is a privately held clean energy equipment manufacturer in East Troy, Wisconsin, that designs and sells microCHP systems, generators, and vapor recovery solutions built on its proprietary long-life Marathon Engine for commercial properties with continuous thermal demand.

Ownership category

akta.pro rank

Product category

Micro Combined Heat and Power (microCHP) Equipment

NAICS

Fossil Fuel Electric Power Generation (221112), Turbine and Turbine Generator Set Units Manufacturing (333611), Electric Power Generation (22111)

SIC

Cogeneration Services & Small Power Producers (4991), Motors & Generators (3621), Engines & Turbines (3510)

akta.pro primary industry

Micro-CHP / Residential CHP (Small-Scale Engine/Stirling/Fuel Cell) (EUACAKAK)

akta.pro secondary industries

Microturbines, Fuel Cells & Distributed Generation Prime Movers (IMAHAFAH), Microgrid & Distributed Grid Equipment (Controllers, Switchgear Packages, DER Interconnection) (IMAGAAAJ)

Keywords

• Micro combined heat power
• Prime power generators
• Remote power solutions
• Vapor recovery systems
• Distributed energy equipment

Headquarters

HQ city

Troy

HQ country

United States

HQ region

North America

Offices1 record

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. MicroCHP Equipment Sales: Sale of EcoPrime microCHP systems as primary revenue stream. Units are sold directly to commercial and multifamily property owners for installation alongside existing boiler systems.
2. Generator and Engine Products: Sale of EnduraGen Generator and Marathon Engine products for prime and remote power applications.
3. Custom Power Solutions: Custom project solutions tailored to unique power generation needs of specific applications.
4. Vapor Recovery Systems: Sale and installation of vapor recovery systems.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels6 records

Core offering

Axiom Energy Group manufactures and sells micro combined heat and power (microCHP) systems, prime and remote power generators, and vapor recovery solutions, all anchored by its proprietary long-life Marathon Engine. The flagship EcoPrime microCHP system generates 1.2–4.4 kW of electricity and 13,000–47,000 BTU/hr of thermal energy from a single fuel source at over 90% system efficiency. Products are built in-house at the company's 70,000 sq ft Midwest facility and sold to commercial and multifamily property owners requiring continuous thermal demand.

Product overview

Axiom Energy Group offers a unified portfolio of power generation solutions anchored by its proprietary long-life Marathon Engine technology. The core product line includes EcoPrime microCHP (simultaneous heat and power generation), EnduraGen Generator (prime/remote power), and the Marathon Engine as foundational technology. The company also provides Custom Projects and Vapor Recovery systems. All products leverage the Marathon Engine's reliability (established 1998, ~40,000 hour life) and are manufactured at the company's 70,000 sq ft facility in East Troy, Wisconsin.

Differentiator

Problem solved

Functional benefit

Brands

• EcoPrime: microCHP (micro Combined Heat and Power) system that produces heat, hot water, and electricity simultaneously from a single fuel source.
• EnduraGen Generator
• Marathon Engine

Products and services

• EcoPrime microCHP

Quantifiable outcome

• Reduces carbon emissions by approximately 30% compared to traditional grid and boiler setups
• +3 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators6 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• Capstone Green Energy: U.S.-based manufacturer of microturbines for distributed power generation and CHP applications. Directly comparable to Axiom in targeting commercial customers with small-scale combined heat and power and on-site generation solutions.
• 2G Energy: German manufacturer of combined heat and power (CHP) systems ranging from small-scale to multi-megawatt units. Comparable as a CHP-focused equipment maker serving commercial and industrial customers with packaged power and heat solutions.
• Yanmar Energy Systems: Japanese manufacturer of micro-CHP and gas-engine-based power systems for commercial and residential markets. Directly comparable to Axiom's EcoPrime microCHP product positioning and target customer profile of small commercial sites.
• SenerTec (Dachs micro-CHP): German manufacturer of the well-known Dachs micro-CHP unit for residential and small commercial buildings. Closely comparable to Axiom in micro-CHP scale, heat-led use case, and engine-based CHP technology.

Broad incumbents

• INNIO Jenbacher: Global gas engine and CHP OEM (Jenbacher, Waukesha brands) serving commercial, industrial, and utility-scale power. Operates in the same CHP space as Axiom but at larger scale and broader geographic reach, with established service networks.
• Generac: Major U.S. manufacturer of power generation equipment including standby and prime-power generators. Comparable to Axiom's EnduraGen generator line and competes for the same commercial/light-industrial backup and remote-power customers, albeit at much greater scale.
• Cummins: Diversified power-generation OEM producing diesel and natural gas generator sets for prime, standby, and CHP applications. Overlaps with Axiom's remote/prime power offerings and competes in commercial distributed-generation deals globally.
• Caterpillar (Cat Electric Power): Large industrial OEM of gas and diesel generator sets and CHP solutions for commercial and industrial customers. Competes with Axiom in larger prime-power and standby-power applications, leveraging a much broader service network.
• Kohler Power Systems: Manufacturer of commercial and industrial generator sets for prime, standby, and remote power. Comparable to Axiom's EnduraGen line and competes in distributed-generation procurement for commercial properties.

Emerging players

• EC Power (AI Energy Group): European developer of small-scale CHP and fuel-flexible generator technology for residential and commercial customers. Overlaps with Axiom's micro-CHP and custom power offerings, particularly in markets pushing distributed low-emission generation.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xfacebook.com/AxiomEnergyGroup
• YouTubeyoutube.com/channel/UCQnYEHsHL75_ntEGgygu3sw
• Facebookfacebook.com/AxiomEnergyGroup
• LinkedInlinkedin.com/company/axiom-energy-group/?viewAsMember=true

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 Axiom Energy Group