Polytherm

What Polytherm does

Polytherm was a French energy systems engineering company that, in 2026, merged with two sister entities — KS Énergie and E3C — under parent KS Groupe to form the unified brand KS Énergies. The combined entity is headquartered at 10 rue de l'atome, 67800 Bischheim, France, and delivers full-lifecycle energy services spanning studies and design, realization, commissioning, and ongoing maintenance and optimization.

The company's technical scope covers electrical engineering (high/low voltage distribution, electrical panels, interior and exterior lighting, fire safety, and weak-current systems including VDI networks, access control, and CCTV), climate engineering (heating, ventilation, air conditioning with regulation and energy management), thermal engineering and industrial utilities (heat/cold production, thermal networks, process optimization), sanitary installations, photovoltaic power plants for industrial, tertiary, and residential clients, and EV charging infrastructure (IRVE) including intelligent management and regulatory compliance. Pricing is project-based and quote-driven, reflecting the bespoke nature of each engagement.

The go-to-market is sales-led and segment-oriented, targeting industrial facilities, tertiary/commercial buildings (as primary segments), and individual residential customers (secondary). As part of KS Groupe — a diversified group with 12 subsidiaries and 460+ employees spanning construction, fit-out, engineering, and energy — the entity benefits from group-level scale, cross-subsidiary expertise, and capacity to execute large integrated projects across France.

Name

Polytherm

Legal name

Polytherm

Website

https://polytherm.fr

Company type

Private

Operating status

Operating

Headcount range

11–50 employees

Short description

Polytherm, now unified as KS Énergies under KS Groupe, is a French energy engineering firm designing, installing, and maintaining electrical, HVAC, thermal, sanitary, photovoltaic, and EV charging systems for industrial, commercial, and residential clients.

Ownership category

akta.pro rank

Product category

Energy Engineering & Building Technical Services

NAICS

Power and Communication Line and Related Structures Construction (237130), Solar Electric Power Generation (221114), Architectural, Engineering, and Related Services (5413)

SIC

Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Solar PV Power Plant EPC (Utility-Scale) (EUAEAAAG)

akta.pro secondary industries

Electrical Balance-of-Plant EPC (MV Collection, Cabling, Earthing, Lighting) (EUAEADAB), Solar Balance-of-Plant EPC (Piles/Foundations, Trenching, Combiner Networks) (EUAEADAJ)

Keywords

• Electrical engineering services
• HVAC installation services
• Photovoltaic system installation
• EV charging infrastructure
• Thermal energy systems

Headquarters

HQ city

Bischheim

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Engineering and Installation Services: Design, realization, and commissioning of energy systems including electrical, climate, thermal, sanitary, photovoltaic, and EV charging infrastructure installations for industrial, commercial, and residential projects.

Go-to-market motion1 record

Distribution channels1 record

Core offering

Polytherm provided energy engineering, installation, and long-term maintenance services for industrial, tertiary/commercial, and residential clients. Its offering spanned six integrated disciplines: electrical engineering (high/low voltage, weak current), HVAC/climate engineering, thermal networks and utilities, sanitary installations, photovoltaic systems, and electric vehicle charging infrastructure (IRVE). The full lifecycle service ranged from initial studies and design through realization, commissioning, and ongoing maintenance/optimization.

Product overview

Polytherm operated as a specialized energy engineering company that has now been merged with KS Énergie and E3C into the unified KS Énergies brand under KS Groupe. This consolidation brought together expertise in electrical engineering (courant fort/courant faible), climate engineering/HVAC, thermal engineering and utilities, plumbing, photovoltaics, and electric vehicle charging infrastructure (IRVE), along with comprehensive maintenance services.

Differentiator

Problem solved

Functional benefit

Products and services

• Génie électrique (Electrical Engineering Services) Design, installation, and maintenance of complete electrical installations for industrial and tertiary buildings, including high/low voltage distribution, electrical panels and cabinets, equipment power supply, interior and exterior lighting, electrical safety systems, VDI (voice/data/image) networks, access control, video surveillance, fire safety systems, and intercom/connected solutions. Target clients are industrial facilities and commercial/tertiary buildings.
• Génie climatique (HVAC / Climate Engineering Services) Design, installation, regulation, and maintenance of heating, ventilation, and air conditioning (CVC) systems tailored to building usage patterns, operational constraints, and energy sobriety objectives. Includes indoor air quality management, energy regulation and piloting, and ongoing CVC system optimization for industrial and commercial clients.
• Génie thermique et utilités (Thermal Engineering & Utilities Services) Engineering, installation, and optimization of thermal networks, heat and cold production, and industrial utilities for industrial and technical environments where reliability and service continuity are critical. Targets energy efficiency optimization in process and building environments.
• Sanitary Installations (Réseaux Sanitaires) Complete installation of sanitary networks and associated systems for new construction and renovation projects, ensuring hygiene, durability, regulatory compliance, and consumption control for industrial, tertiary, and residential clients.
• Photovoltaic Systems (Photovoltaïque) Design and installation of photovoltaic power plants on industrial and tertiary buildings, as well as residential solar panel installations for energy self-consumption and decarbonization. Targets professionals seeking energy transition projects and individual homeowners (Particuliers) seeking energy independence.
• IRVE — EV Charging Infrastructure Design and installation of electric vehicle charging infrastructure (IRVE) for businesses, local authorities, and tertiary sites, including charging stations, intelligent management systems, regulatory compliance, and scalable installation capacity.
• Maintenance and Optimization Services Long-term maintenance, malfunction anticipation, and ongoing optimization services for the installed energy systems (electrical, HVAC, thermal, sanitary, photovoltaic, and EV charging) to prolong equipment lifespan, reduce energy consumption, and ensure operational continuity for industrial, tertiary, and residential clients.

Quantifiable outcome

• Prolonged equipment lifespan through proactive maintenance programs
• +2 more outcomes

Segments3 records

Ideal customer profiles3 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.

• KS Énergie (formerly separate entity)coreStrategic or Co-development PartnerKS Énergie merged with Polytherm and E3C to form a unified KS Énergies brand, combining expertise to deliver comprehensive energy solutions with coordinated capabilities across electrical, climate, thermal, and renewable energy systems.
• E3CcoreStrategic or Co-development PartnerE3C merged with Polytherm and KS Énergie to form KS Énergies, consolidating energy expertise under a single brand to address global energy challenges with integrated, coordinated, and sustainable solutions.
• KS GroupecoreStrategic or Co-development PartnerKS Groupe is the parent company of KS Énergies (formerly Polytherm, KS Énergie, E3C) and 12 other subsidiaries. The group provides integrated expertise across construction, fitting, engineering, and energy services with 460+ collaborators.

Scale indicators1 record

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Bouygues Energies & Services: Bouygues Energies & Services is the technical services subsidiary of Bouygues, offering electrical, HVAC, and energy infrastructure across France and Europe. Highly comparable business model and customer profile to KS Énergies.
• ENGIE Solutions: ENGIE Solutions is the B2B energy services arm of ENGIE, providing energy efficiency, HVAC, electrical, and renewable energy installations to industrial and tertiary clients. Overlaps significantly with KS Énergies' integrated energy offering.
• Eiffage Énergie Systèmes: Eiffage Énergie Systèmes is the energy services division of Eiffage Group, providing electrical installations, HVAC, and renewable energy solutions in France. It directly overlaps with KS Énergies' multi-disciplinary energy engineering offering for industrial and tertiary customers.
• Vinci Energies: Vinci Energies is the energy and electrical infrastructure arm of the Vinci group, delivering electrical engineering, HVAC, and renewable energy installations across Europe. Comparable to KS Énergies in service scope and customer segments but operating at much greater scale and geographic reach.
• Equans France: Equans is a major European multi-technical services group with significant French operations covering electrical, HVAC, and energy efficiency. Directly comparable to KS Énergies' integrated service portfolio, though at substantially larger scale.
• Spie SA: Spie is a major French multi-technical services group providing electrical, HVAC, and energy efficiency solutions to industrial, commercial, and public-sector clients. It is the most direct broad incumbent competitor to KS Énergies in the French multi-disciplinary energy services space.
• Cegelec: Cegelec (a Vinci Energies subsidiary) provides electrical and HVAC engineering and installation services across France and Europe for industrial and commercial customers. Overlaps directly with KS Énergies' electrical and climate engineering offerings.

Direct peers

• SNEF (Groupe SNEF): SNEF is a French independent multi-technical services firm specializing in electrical engineering, HVAC, and energy infrastructure for industrial and commercial buildings. Closely comparable mid-sized competitor with similar multi-disciplinary service model.
• ETDE (Bouygues Énergies & Services subsidiary): ETDE specializes in electrical infrastructure, public lighting, and energy networks for industrial and public-sector clients in France. Comparable to KS Énergies' electrical BoP and infrastructure installation work.

Regional players

• Altherm: Altherm is a fellow KS Groupe subsidiary visible on the KS Énergies website, focused on thermal and energy engineering. An intra-group adjacent peer with shared ownership and overlapping but not identical technical scope.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/polytherm-ks-groupe

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 Polytherm