# Top 30 critical infrastructure operators in the Isère department

Tamtam tracks 41 critical infrastructure operators headquartered in the Isère department. This list ranks the 30 largest by number of employees on LinkedIn, led by CHU Grenoble Alpes, Grenoble-Alpes Métropole and SDIS38 - Service Départemental d'Incendie et de Secours de l'Isère. Their median headcount is 244. Half of them were founded in 1970 or later. The most common headquarters are Grenoble (9), Bourgoin-Jallieu (3) and Saint-Martin-d'Hères (2).

The Isère department's critical infrastructure operators are mostly large public sector organizations and mid-sized healthcare providers. These include major regional hospitals like CHU Grenoble Alpes, public safety services such as SDIS38, and urban transit operators like M TAG. Renewable energy is also represented by companies like GEG - Gaz Electricité de Grenoble and Waga Energy, which converts landfill gas into biomethane.

A clear pattern is the strong presence of healthcare institutions, with hospitals like Centre Hospitalier Alpes-Isère in Saint-Égrève and Clinique Belledonne - ELSAN in Saint-Martin-d'Hères. Government administrations like Grenoble-Alpes Métropole and Le Grésivaudan - Communauté de communes also form a significant cluster, reflecting the essential public services in the region.

🇫🇷 Isère · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CHU Grenoble Alpes](https://www.tamtam.ai/c/chu-grenoble-alpes) (chu-grenoble.fr)<br>Major regional hospital providing comprehensive medical, surgical, emergency care, and health research across multiple specialized disciplines and advanced technology. | Hospitals and Health Care | 🇫🇷 Grenoble | 3,812 |  |
| 2 | [Grenoble-Alpes Métropole](https://www.tamtam.ai/c/grenoble-alpes-metropole) (grenoblealpesmetropole.fr)<br>Leading administration in Grenoble responsible for transportation, waste management, economic development, and environmental preservation within the city | Government Administration | 🇫🇷 Grenoble | 1,121 | 1996 |
| 3 | [SDIS38 - Service Départemental d'Incendie et de Secours de l'Isère](https://www.tamtam.ai/c/sdis38-service-departemental-d-incendie-et-de-secours-de-l-isere) (sdis38.fr)<br>Organization of fire and rescue services across 21 centers, operational command, prevention actions, and administrative management under local authorities. | Public Safety | 🇫🇷 Fontaine | 774 | 1955 |
| 4 | [Centre Hospitalier Alpes-Isère](https://www.tamtam.ai/c/centre-hospitalier-alpes-isere) (ch-alpes-isere.fr)<br>Provides specialized psychiatric care for adults, adolescents, and children across multiple sites, including hospitals and outpatient centers. | Hospitals and Health Care | 🇫🇷 Saint-Égrève | 670 |  |
| 5 | [M TAG](https://www.tamtam.ai/c/m-tag) (m-tag.fr)<br>Management and operation of tram and bus lines, mobility agencies, and park-and-ride facilities in the Grenoble metropolitan area. | Urban Transit Services | 🇫🇷 Grenoble | 429 | 1975 |
| 6 | [GEG - Gaz Electricité de Grenoble](https://www.tamtam.ai/c/geg-gaz-electricite-de-grenoble) (groupe.geg.fr)<br>Energy production, distribution, and supply with focus on renewable sources, sustainability, and community engagement across France. | Renewable Energy Power Generation | 🇫🇷 Grenoble | 386 | 1867 |
| 7 | [La Mut' - GHM de Grenoble](https://www.tamtam.ai/c/la-mut-ghm-de-grenoble) (ghm-grenoble.fr)<br>A non-profit healthcare group in Grenoble offers medical services, surgery, maternity, and more Part of a larger health group focused on social impact and innovation | Hospitals and Health Care | 🇫🇷 Grenoble | 383 | 1958 |
| 8 | [Centre Hospitalier Lucien Hussel](https://www.tamtam.ai/c/centre-hospitalier-lucien-hussel) (ch-vienne.fr)<br>The hospital offers a diverse range of medical services including emergency care, specialized treatments, maternity care, geriatrics, and an Institute for Nursing Education | Hospitals and Health Care | 🇫🇷 Vienne | 353 | 1967 |
| 9 | [Waga Energy](https://www.tamtam.ai/c/waga-energy) (waga-energy.com)<br>This company converts landfill gas into Renewable Natural Gas (RNG) using patented technology, reducing CO2 emissions and supplying households with biomethane | Renewable Energy Power Generation | 🇫🇷 Eybens | 316 | 2015 |
| 10 | [Le Grésivaudan - Communauté de communes](https://www.tamtam.ai/c/le-gresivaudan-communaute-de-communes) (le-gresivaudan.fr)<br>A community of 43 municipalities with over 100,000 residents, working together to provide services and support in Le Grésivaudan | Government Administration | 🇫🇷 Crolles | 296 | 2009 |
| 11 | [GHND - Groupement Hospitalier Nord-Dauphiné](https://www.tamtam.ai/c/ghnd-groupement-hospitalier-nord-dauphine) (ghnd.fr)<br>The healthcare facility provides medical services to a territory with 230,000 residents, offering a range of care including medicine, surgery, pediatrics, and elderly care | Hospitals and Health Care | 🇫🇷 Bourgoin-Jallieu | 261 | 2016 |
| 12 | [Pays Voironnais](https://www.tamtam.ai/c/pays-voironnais) (paysvoironnais.com)<br>Autonomous living area with 31 communes, providing urban functions, services, and economic development through traditional and high-tech industries. | Government Administration | 🇫🇷 Voiron | 258 | 1974 |
| 13 | [Clinique Belledonne - ELSAN](https://www.tamtam.ai/c/clinique-belledonne-elsan) (elsan.care)<br>Hospital & health care company in Rhone-Alpes, France, located in Saint-Martin-d'Hères Specializes in providing medical services to patients | Hospitals and Health Care | 🇫🇷 Saint-Martin-d'Hères | 255 |  |
| 14 | [GROUPE AGIR à dom](https://www.tamtam.ai/c/groupe-agir-a-dom) (agiradom.com)<br>Provides home healthcare services specializing in respiratory assistance, infusion, nutrition, diabetes, and medical equipment across 14 French departments. | Home Health Care Services | 🇫🇷 Meylan | 247 | 1974 |
| 15 | [Clinique des Cèdres](https://www.tamtam.ai/c/clinique-des-cedres) (cliniquedescedres.com)<br>Modern medical facility offering 24/7 emergency surgical services, continuous care, maternity, orthopedics, and ambulatory surgery with high safety standards. | Hospitals and Health Care | 🇫🇷 Échirolles | 244 |  |
| 16 | [VFD](https://www.tamtam.ai/c/vfd) (vfd.fr)<br>Transport company offering daily commute services for work and school, as well as vacation and leisure travel, covering multiple regions and serving millions of passengers annually | Ground Passenger Transportation | 🇫🇷 Saint-Égrève | 243 | 1894 |
| 17 | [UNIBIO Laboratoire de Biologie Médicale](https://www.tamtam.ai/c/unibio-laboratoire-de-biologie-medicale) (labo-unibio.fr)<br>Multisite independent laboratory group owned by medical biologists, providing local medical biology services across the Auvergne-Rhône-Alpes region. | Medical and Diagnostic Laboratories | 🇫🇷 Chasse-sur-Rhône | 229 | 2002 |
| 18 | [Fondation Georges BOISSEL](https://www.tamtam.ai/c/fondation-georges-boissel) (fondation-boissel.fr)<br>Management of mental health, psychic disability, and social reintegration facilities, adapting services to regional health and social policy needs. | Hospitals and Health Care | 🇫🇷 Bourgoin-Jallieu | 221 | 1970 |
| 19 | [Clinique Saint Vincent de Paul](https://www.tamtam.ai/c/clinique-saint-vincent-de-paul) (clinique-bourgoin.com)<br>Healthcare facility providing surgical care, maternity services, and patient support with a focus on comfort, dignity, and innovative treatments. | Wellness and Fitness Services | 🇫🇷 Bourgoin-Jallieu | 169 | 1930 |
| 20 | [🎗Centre Médical Rocheplane Fondation Audavie](https://www.tamtam.ai/c/centre-medical-rocheplane-fondation-audavie) (audavie.fr)<br>Established in 1928, the company provides specialized care in rehabilitation and geriatrics, aiming to support patients through acute care, rehabilitation, and reintegration into daily life | Hospitals and Health Care | 🇫🇷 Saint-Martin-d'Hères | 162 | 1928 |
| 21 | [Compagnie de Chauffage](https://www.tamtam.ai/c/compagnie-de-chauffage) (compagniedechauffage.fr)<br>Management and operation of an extensive urban heat network supplying over 100,000 homes with 82% renewable and recovered energy. | Environmental Services | 🇫🇷 Grenoble | 138 | 1960 |
| 22 | [Assurance Maladie de l'Isère](https://www.tamtam.ai/c/assurance-maladie-de-l-isere) (ameli.fr)<br>A social security organization in Isère, implementing national health insurance policies, ensuring access to healthcare, promoting prevention, and improving healthcare efficiency | Government Administration | 🇫🇷 Grenoble | 136 |  |
| 23 | [PERRAUD Group](https://www.tamtam.ai/c/perraud-group) (groupeperraud.com)<br>providing tailored transport and tourism services for all individuals including students, disabled, patients, tourists, and general public | Travel Arrangements | 🇫🇷 Tullins | 131 | 1945 |
| 24 | [CARS FAURE](https://www.tamtam.ai/c/cars-faure) (fauretransport.fr)<br>One of the top private passenger transport companies in France, operating a fleet of over 1,100 vehicles and serving numerous public entities | Ground Passenger Transportation | 🇫🇷 Valencin | 117 | 1848 |
| 25 | [GROUPE CLINIQUE DU MAIL](https://www.tamtam.ai/c/groupe-clinique-du-mail) (groupedumail.fr)<br>A medical imaging clinic providing advanced diagnostic services to patients for accurate and timely medical assessments and treatments | Hospitals and Health Care | 🇫🇷 Grenoble | 109 | 1959 |
| 26 | [Entre Bièvre et Rhône Communauté de communes](https://www.tamtam.ai/c/entre-bievre-et-rhone-communaute-de-communes) (entre-bievreetrhone.fr)<br>A community of 37 municipalities in Isère, France, serving nearly 67,000 residents between the Bièvre and Rhône rivers | Government Administration | 🇫🇷 Saint-Maurice-l'Exil | 99 | 2019 |
| 27 | [GreenAlp](https://www.tamtam.ai/c/greenalp) (greenalp.fr)<br>For the past 150 years, this company has been distributing gas and electricity in Grenoble, focusing on technical expertise, customer culture, innovation, and future energy models | Utilities | 🇫🇷 Grenoble | 85 | 2019 |
| 28 | [CETUP](https://www.tamtam.ai/c/cetup) (cetup.com)<br>Specializing in unique and customized transport solutions, the company ensures delivery of high-value products worldwide 24/7, focusing on reliability, quality, and security | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Moirans | 68 | 1988 |
| 29 | [CHUGA - Voiron](https://www.tamtam.ai/c/chuga-voiron) (ch-voiron.fr)<br>Public health establishment with 362 beds offering a wide range of medical services including surgeries, cardiology, geriatrics, pediatrics, maternity, emergency care, and imaging | Hospitals and Health Care | 🇫🇷 Voiron | 57 | 1812 |
| 30 | [Centre Hospitalier Michel Perret de Tullins](https://www.tamtam.ai/c/centre-hospitalier-michel-perret-de-tullins) (ch-tullins.fr)<br>The healthcare facility offers a diverse range of inpatient and outpatient services, specializing in rehabilitation and geriatric care within its territory | Hospitals and Health Care | 🇫🇷 Tullins | 52 |  |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in the Isère department

- [The largest companies in the Isère department](https://www.tamtam.ai/l/largest-companies-isere) (1,457)
- [Companies with in-house R&D in the Isère department](https://www.tamtam.ai/l/r-and-d-companies-isere) (304)
- [Manufacturers in the Isère department](https://www.tamtam.ai/l/manufacturers-isere) (178)
- [Multinational companies in the Isère department](https://www.tamtam.ai/l/multinational-companies-isere) (174)
- [Hardware manufacturers in the Isère department](https://www.tamtam.ai/l/hardware-companies-isere) (143)
- [Retail chains in the Isère department](https://www.tamtam.ai/l/retail-chains-isere) (100)
- [Software Development companies in the Isère department](https://www.tamtam.ai/l/software-development-companies-isere) (90)
- [Professional services firms in the Isère department](https://www.tamtam.ai/l/professional-services-firms-isere) (87)
- [Public sector organisations in the Isère department](https://www.tamtam.ai/l/public-sector-organisations-isere) (80)
- [Distributors and wholesalers in the Isère department](https://www.tamtam.ai/l/distributors-and-wholesalers-isere) (78)
- [IT services companies in the Isère department](https://www.tamtam.ai/l/it-services-companies-isere) (75)
- [SaaS companies in the Isère department](https://www.tamtam.ai/l/saas-companies-isere) (72)
- [Electronics and semiconductor companies in the Isère department](https://www.tamtam.ai/l/electronics-companies-isere) (70)
- [Contract manufacturers in the Isère department](https://www.tamtam.ai/l/contract-manufacturers-isere) (68)
- [IT Services and IT Consulting companies in the Isère department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-isere) (68)
- [Family-owned companies in the Isère department](https://www.tamtam.ai/l/family-owned-companies-isere) (61)
- [Industrial Machinery Manufacturing companies in the Isère department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-isere) (58)
- [Consulting firms in the Isère department](https://www.tamtam.ai/l/consulting-firms-isere) (57)
- [Construction companies in the Isère department](https://www.tamtam.ai/l/construction-companies-isere) (52)
- [Pharmaceutical companies in the Isère department](https://www.tamtam.ai/l/pharmaceutical-companies-isere) (47)
- [Education providers in the Isère department](https://www.tamtam.ai/l/education-companies-isere) (46)
- [Medical device companies in the Isère department](https://www.tamtam.ai/l/medical-device-companies-isere) (43)
- [Energy companies in the Isère department](https://www.tamtam.ai/l/energy-companies-isere) (41)
- [Chemical companies in the Isère department](https://www.tamtam.ai/l/chemical-companies-isere) (40)

## The same list elsewhere in France

- [Critical infrastructure operators in France](https://www.tamtam.ai/l/critical-infrastructure-operators-france) (2,721)
- [Critical infrastructure operators in Île-de-France](https://www.tamtam.ai/l/critical-infrastructure-operators-ile-de-france) (780)
- [Critical infrastructure operators in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/critical-infrastructure-operators-auvergne-rhone-alpes) (299)
- [Critical infrastructure operators in Grand Est](https://www.tamtam.ai/l/critical-infrastructure-operators-grand-est) (257)
- [Critical infrastructure operators in Occitanie](https://www.tamtam.ai/l/critical-infrastructure-operators-occitanie) (216)
- [Critical infrastructure operators in Nouvelle-Aquitaine](https://www.tamtam.ai/l/critical-infrastructure-operators-nouvelle-aquitaine) (209)
- [Critical infrastructure operators in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/critical-infrastructure-operators-provence-alpes-cote-dazur) (200)
- [Critical infrastructure operators in Hauts-de-France](https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-france) (174)
- [Critical infrastructure operators in the Hauts-de-Seine department](https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-seine) (169)
- [Critical infrastructure operators in Pays de la Loire](https://www.tamtam.ai/l/critical-infrastructure-operators-pays-de-la-loire) (127)
- [Critical infrastructure operators in Brittany](https://www.tamtam.ai/l/critical-infrastructure-operators-brittany) (120)
- [Critical infrastructure operators in Normandy](https://www.tamtam.ai/l/critical-infrastructure-operators-normandy) (103)
- [Critical infrastructure operators in the Bouches-du-Rhône department](https://www.tamtam.ai/l/critical-infrastructure-operators-bouches-du-rhone) (98)
- [Critical infrastructure operators in the Rhône department](https://www.tamtam.ai/l/critical-infrastructure-operators-rhone) (94)
- [Critical infrastructure operators in Centre-Val de Loire](https://www.tamtam.ai/l/critical-infrastructure-operators-centre-val-de-loire) (87)
- [Critical infrastructure operators in the Nord department](https://www.tamtam.ai/l/critical-infrastructure-operators-nord) (87)
- [Critical infrastructure operators in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/critical-infrastructure-operators-bourgogne-franche-comte) (76)
- [Critical infrastructure operators in the Haute-Garonne department](https://www.tamtam.ai/l/critical-infrastructure-operators-haute-garonne) (64)
- [Critical infrastructure operators in the Gironde department](https://www.tamtam.ai/l/critical-infrastructure-operators-gironde) (63)
- [Critical infrastructure operators in the Loire-Atlantique department](https://www.tamtam.ai/l/critical-infrastructure-operators-loire-atlantique) (59)
- [Critical infrastructure operators in the Hérault department](https://www.tamtam.ai/l/critical-infrastructure-operators-herault) (57)
- [Critical infrastructure operators in the Seine-Saint-Denis department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-saint-denis) (53)
- [Critical infrastructure operators in the Seine-Maritime department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-maritime) (46)
- [Critical infrastructure operators in Paris](https://www.tamtam.ai/l/critical-infrastructure-operators-paris) (331)

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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-isere