SEY 78 - Syndicat d'Energie des Yvelines

What SEY 78 - Syndicat d'Energie des Yvelines does

SEY 78 (Syndicat d'Énergie des Yvelines) is a French public intercommunal energy syndicate founded in 2000 through the merger of SIVAMASA and SIDEYNE, headquartered in Jouars-Pontchartrain, Yvelines. It serves as the designated distribution authority (AODE) for public electricity and gas distribution across 201 communes in the Yvelines and Val d'Oise departments, representing a population of approximately 1,010,000 for electricity and 581,646 for gas. SEY manages a 25-year concession contract with Enedis and EDF (signed November 21, 2019) covering 9,285 km of electricity network, while a separate concession with GrDF covers 1,749 km of gas pipelines and 118,445 active meters. Beyond distribution oversight, SEY coordinates group purchasing of electricity (191 members, 4,400+ sites) and natural gas (103 members, 837 sites) with EDF and ENGIE, operates the SEY Ma Borne public EV charging network spanning 113 communes with nearly 570 charging points (over 7,000 sessions per month), and delivers energy demand management services (CEE, CEP, EMIT contracts) and project management assistance for network burial and public lighting.

The organization's technology stack centers on the SYNCOM-powered Portail Cartographique (SIG) for visualizing electricity, gas, and infrastructure networks across member territories, the Alizé Charge platform for EV charging operations, and Enedis smart meters enabling real-time tracking of collective self-consumption schemes. SEY develops renewable energy projects through its wholly-owned subsidiary SEY Énergies Renouvelables (created February 2021), including solar canopy installations at Bougival (213 kWc), Thoiry (275 kWc), and Bonnières-sur-Seine (276 kWc), and through its joint venture interest in SAS VerdY (June 2025) for deep geothermal district heating. The organization participates in the Pôle Énergie Île-de-France cooperation framework with peer Île-de-France syndicates and engages ADEME and Région Île-de-France for co-funding.

Revenue is generated primarily through R1 functioning fees and R2 investment royalties paid by Enedis and GrDF (based on network length and population), TCCFE (Tax on Final Electricity Consumption) administration for 123 communes with populations ≤2,000 inhabitants, and usage-based EV charging tariffs (no subscription required). No membership fees are charged to communes. Governance rests with elected officials: President Benoît Petitprez and 13 Vice-Presidents representing the various intercommunal structures, supported by a lean operational team of approximately 10-12 staff.

Name

SEY 78 - Syndicat d'Energie des Yvelines

Legal name

Syndicat d'Energie des Yvelines

Website

https://sey78.fr

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

11–50 employees

Short description

SEY 78 is a French public intercommunal energy syndicate serving as the designated distribution authority for electricity and gas across 201 communes in Yvelines, while also coordinating group energy purchasing, operating the SEY Ma Borne EV charging network (~570 points), and developing renewable energy projects through its subsidiary and joint ventures.

Ownership category

akta.pro rank

Product category

Public Energy Distribution Authority

NAICS

Electric Power Generation, Transmission and Distribution (2211), Electric Power Distribution (221122)

SIC

Electric, Gas & Sanitary Services (4900)

akta.pro primary industry

Behind-the-Meter Aggregators Acting as DSO (Virtual Power Plant / Community Energy Operators) (EUADABAG)

akta.pro secondary industries

Multi-Utility Distribution Companies (Electric + Gas/Water Distribution) (EUADABAJ), EV Charging & Fleet VPP Aggregation (Managed Charging, V2G, Depot/Highway) (EUAFAHAC)

Keywords

• Public electricity distribution
• Energy concession authority
• Group energy procurement
• EV charging infrastructure
• Renewable energy development

Headquarters

HQ city

Jouars-Pontchartrain

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Concession Fees (Redevances R1 and R2): SEY receives two types of concession fees from Enedis and GrDF: (1) R1 operating fee based on network length and population, covering SEY's operating costs; (2) R2 investment fee, calculated based on investment work on the electricity network, which SEY reverses to member municipalities at a 30% premium over what municipalities would have received directly. Fees are funded by levies on all subscriber invoices. No membership fees are charged to communes.
2. TCCFE (Taxe sur la Consommation Finale d'Électricité): For communes with population ≤ 2,000 inhabitants, SEY collects and redistributes the TCCFE (Tax on Final Electricity Consumption) using a single rate set by the SEY Committee (set at 8 since January 2018). SEY administers this on behalf of 123 communes, handling collection, control, and redistribution.
3. EV Charging Network (SEY Ma Borne): Revenue from public EV charging services. Usage-based pricing for 22 kW AC and 36 kW DC charging points. Badge costs €9.60 (one-time). No subscription required. Managed via Alizé platform.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

SEY 78 is a public intermunicipal energy syndicate that acts as the organizing authority for public electricity and gas distribution across 201 member communes in the Yvelines and Val d'Oise departments. It provides concession control over Enedis and GrDF networks (9,285 km of electricity lines, 1,749 km of gas pipelines), coordinates group purchasing of electricity and natural gas for member municipalities, deploys public EV charging infrastructure (SEY Ma Borne network with nearly 570 charging points), develops renewable energy projects through its SEY Énergies Renouvelables subsidiary and SAS VerdY geothermal joint venture, and offers energy demand management, project management assistance, and cartographic information services. No membership fees are charged to communes; the organization is funded through concession fees (R1 and R2) and usage-based EV charging revenue.

Product overview

SEY 78 operates as a multi-service public energy authority organizing distribution networks and supporting energy transition for 201 member communes in Yvelines. The organization functions as a unified portfolio of interconnected services centered on its core electricity and gas distribution authority role, supplemented by the SEY Ma Borne EV charging network brand, the SEY Énergies Renouvelables subsidiary for solar/geothermal projects, collective energy procurement groupements, energy demand management programs, project management assistance for infrastructure, and a geographic information system portal. The SEY Ma Borne network, the renewable energy subsidiary, and the cartographic portal represent the most differentiated product lines, while electricity/gas distribution, group purchasing, and financial support services form the foundational offerings.

Differentiator

Problem solved

Functional benefit

Brands

• SEY Ma Borne: Public electric vehicle charging network operated by SEY with nearly 570 charging points across 113 communes
• SEY EnR

Products and services

• SEY Ma Borne (Public EV Charging Network) Public electric vehicle charging network managed by SEY, featuring accelerated charging stations (3-22 kW) and fast DC charging (up to 36 kW). The network includes nearly 570 charging points across 113 communes, with Alizé Charge as the partner platform for access control, localization, and billing. Available to all EV drivers in Yvelines on a usage-based pricing model.
• Public Electricity Distribution Authority (Distribution d'Électricité) Authority organizing service for public electricity distribution across 201 communes in Yvelines and Val d'Oise, including concession control, quality monitoring, and network investment coordination with Enedis. Covers 9,285 km of electricity network (low voltage and high voltage type A/HTA) and 1,010,373 inhabitants.
• Public Gas Distribution Authority (Distribution de Gaz) Authority organizing service for public natural gas distribution across 93 communes, representing 581,646 inhabitants, 1,749 km of pipelines, and 118,445 active residential meters, with GrDF concession control. Concession contract signed November 2013.
• Collective Energy Procurement (Achats Groupés d'Énergie) Collective energy procurement service coordinating group purchasing of electricity and natural gas for member communes. The electricity grouping covers 191 members and 4,400+ sites; the gas grouping covers 103 members, 121 communes, and 837 sites. EDF awarded for electricity, ENGIE for natural gas, with 3-year duration contracts.
• SEY Énergies Renouvelables (Renewable Energy Operations) Renewable energy subsidiary created in February 2021 to support member communes in developing photovoltaic solar projects on their heritage, managing solar installations and collective self-consumption schemes. Includes solar canopy projects at Bougival (213 kWc), Thoiry (275 kWc), and Bonnières-sur-Seine (276 kWc).
• Energy Demand Management (Maîtrise de la Demande en Énergie - MDE) Energy demand management services including Energy Savings Certificates (CEE) promotion, shared energy advisory (CEP) through ALEC and Énergies Solidaires partnerships (€4,000 per commune for 3-year conventions), heating/ventilation/maintenance (EMIT) contracts, and thermal building audits for member communes.
• Project Management Assistance (Assistance à Maîtrise d'Ouvrage) Project management assistance for network burial work, road development, and public lighting. Services include topographic surveys, asbestos/HAP diagnostics in road surfaces, and engineering support for infrastructure projects. Enedis co-funds 40% of network burial operations.
• Cartographic Portal (Portail Cartographique / SIG) Geographic Information System portal providing visualization of electricity and gas networks across member territories, with additional capabilities for public lighting, sanitation, water, and urban furniture mapping. Powered by SYNCOM platform (cartographie.syncom.fr).
• Financial Support Services (Accompagnement Financier) Financial support services including R2 investment royalty reversals (at 30% premium over direct municipal receipt), network burial co-financing (40% from concessionnaire Enedis), energy efficiency subsidies, and shared energy advisory (CEP) co-funding at €4,000 per commune.

Quantifiable outcome

• 9.6 tonnes CO₂ avoided per year (Bougival solar canopy)
• +7 more outcomes

Named customers6 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Feature3 records

Partnerships

15 partnerships are on record, tiered core, major and minor.

• Pôle Énergie Île-de-FrancecoreStrategic or Co-development Partner · 1 January 2017Created in 2017 by the five energy syndicates of Île-de-France (SDESM, SEY, SIGEIF, SIPPEREC, SMEGTVO) as a cooperation framework to optimize, rationalize, and coordinate actions on their respective territories. SEY held the rotating presidency from May 29, 2019 for one year. Constitutes a network of competencies for energy mastery and efficiency.
• EnediscoreStrategic or Co-development PartnerEnedis is the electricity distribution concessionnaire operating SEY's electricity network (9,285 km). SEY, as distribution authority, controls and monitors Enedis's performance under the 25-year concession contract signed November 21, 2019. Enedis also co-funds 40% of network burial operations.
• GRDF (Gaz Réseaux Distribution France)coreStrategic or Co-development PartnerGRDF is the gas distribution concessionnaire managing SEY's gas network (1,749 km, 118,445 meters). SEY controls GRDF's performance under a concession contract signed November 2013. GRDF also develops methanization projects on SEY's territory.
• FNCCR (Fédération Nationale des Collectivités Concédantes et Régies)coreStrategic or Co-development PartnerSEY is a member of the FNCCR, the national federation representing local authorities that are concession-granting entities. FNCCR negotiated the model concession contract framework signed December 21, 2017 with Enedis and EDF.
• ADEME (Agence de l'Environnement et de la Maîtrise de l'Énergie)majorStrategic or Co-development PartnerADEME is the French Environment and Energy Management Agency. SEY works with ADEME on financing energy efficiency projects and renewable energy development, including the SAS VerdY geothermal project.
• EDFcoreStrategic or Co-development PartnerEDF is the awarded supplier for SEY's electricity group purchasing program (market covering 191 members, 222 municipalities, 4,400+ sites for 2026). SEY and EDF signed the new Cahier des Charges de Concession in November 2019. EDF also handles regulated tariff electricity supply to consumers.
• ENGIEcoreStrategic or Co-development PartnerENGIE is the awarded supplier for SEY's natural gas group purchasing program (3rd group with 103 members, 121 communes, 837 sites, renewed January 2023). ENGIE is also a partner in the SAS VerdY geothermal project.
• SIGEIF (Syndicat Intercommunal pour le Gaz et l'Électricité en Île-de-France)majorStrategic or Co-development PartnerSEY partners with SIGEIF on joint group purchasing commands (for gas, electricity, and diagnostics), shared expertise, and the SAS VerdY geothermal project. SIGEIF is also a member of the same Île-de-France energy pole.
• SDESM (Syndicat Départemental des Énergies de Seine-et-Marne)majorStrategic or Co-development PartnerSEY partners with SDESM on joint group purchasing (EMIT contracts, topographical surveys, asbestos/HAP diagnostics) and shares expertise through the Île-de-France energy pole.
• SAS VerdYmajorStrategic or Co-development PartnerSAS VerdY is a jointly created company (with SEY, Yvelines Department, SIGEIF, and ENGIE Solutions) dedicated to deep geothermal energy production and distribution. SEY is a shareholder. The network will serve Bailly, Bougival, La Celle-Saint-Cloud, Le Chesnay-Rocquencourt, and Noisy-le-Roi. Over 70% of energy supplied will be from renewable sources.
• SPIE (via SPIE City Networks)minorImplementation/ SI/ Consulting PartnerSPIE provides maintenance and operations services for SEY's solar installations (including the Bougival canopy). SPIE City Networks was awarded the Bonnières-sur-Seine solar project installation.
• Eiffage Énergie Systèmes IDFminorImplementation/ SI/ Consulting PartnerEiffage Énergie Systèmes IDF was awarded the contract for constructing the Thoiry solar canopy (275 kWc, 570 photovoltaic panels), selected by SEY's Call for Tenders Commission on June 18, 2025.
• ALEC (Agence Locale de l'Énergie et du Climat)minorStrategic or Co-development PartnerALEC operates in southern Yvelines providing Conseil en Énergie Partagé (CEP) services to municipalities, co-funded by SEY (€4,000 per commune for 3-year conventions).
• Énergies SolidairesminorStrategic or Co-development PartnerÉnergies Solidaires provides CEP (shared energy advisory) services in northern Yvelines, co-funded by SEY (€4,000 per commune for 3-year conventions).
• Département des YvelinesmajorStrategic or Co-development PartnerThe Yvelines Department is a key strategic partner, notably in the SAS VerdY geothermal project. The Préfecture of Yvelines also validates SEY's SDIRVE (EV charging infrastructure master plan).

Scale indicators12 records

Recent moves9 records

Expansion highlights6 records

Direct peers

• SMEGTVO - Syndicat Mixte d'Électricité Gaz et Télécommunications du Val d'Oise: Direct peer and partner within Pôle Énergie Île-de-France. SMEGTVO serves the Val d'Oise department with the equivalent AODE role over electricity, gas and telecommunications networks, with similar member services.
• SIPPEREC - Syndicat Intercommunal de la Périphérie de Paris pour les Énergies et les Réseaux de Communication: Direct peer within Pôle Énergie Île-de-France. SIPPEREC serves as AODE for peripheral Île-de-France communes, with overlapping services in group purchasing, EV charging deployment, and digital/energy networks.
• SIGEIF - Syndicat Intercommunal pour le Gaz et l'Électricité en Île-de-France: Direct peer and partner within Pôle Énergie Île-de-France. SIGEIF performs the identical AODE role for communes in the other Île-de-France departments (Paris, Val-de-Marne, Essonne), with comparable group purchasing, EV charging, and renewable energy activities. They jointly co-own SAS VerdY.
• SDESM - Syndicat Départemental des Énergies de Seine-et-Marne: Direct peer and partner within Pôle Énergie Île-de-France. SDESM is the AODE for Seine-et-Marne department with the same service portfolio (electricity/gas distribution authority, group purchasing, EV charging, renewable energy development).

Others

• Enedis: Counterparty operator, not a peer. Enedis is the electricity distribution concessionnaire that physically operates the 9,285 km network under SEY's authority. Included because it is the most consequential partner shaping SEY's business model and value capture.
• FNCCR - Fédération Nationale des Collectivités Concédantes et Régies: National federation to which SEY belongs. FNCCR represents local authorities in concession relationships and negotiates the model concession contracts with Enedis/EDF and GRDF. Not a direct operator but the institutional framework governing SEY's existence.

Regional players

• Hérault Énergies: French departmental energy syndicate serving Hérault (Occitanie). Performs the same AODE function over a single department, with comparable group purchasing, EV charging, and renewable energy project development activities. Useful benchmark for SEY's operational model.
• Syndicat d'Énergie de l'Ain (SIEA): French departmental energy syndicate operating in the Ain department. Equivalent AODE role with similar service portfolio including optical fiber deployment, EV charging, and renewable energy, making it a useful geographic peer for SEY.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/syndicat-d'energie-des-yvelines

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries3 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 SEY 78 - Syndicat d'Energie des Yvelines