The environment

The city of Arpajon in the Essonne

14 districts, 63,800 inhabitants, 10,000 ha.

Between Evry and Massy
• Road access from the N104, D19, in between
the A10 and A6 motorways
30 min from Paris (Porte d’Orléans) (via the A6 > A10 > N20)

• RER C: 45 min train ride from Paris
‘Bibliothèque F. Mitterrand’
Trains run 5am – 12 midnight (1 train every 30 min)

• Massy TGV (high-speed train service
/ International Paris Orly Airport: 25 min)

Economic development:
• 2,200 companies
• 14 economic clusters: 120 ha

A few figures
on Arpajon

9,700 ha
61,000 inhabitants
27,000 employed individuals
17,300 local jobs

37 restaurants including one Michelin-starred restaurant

Between the country and the city

Arpajon is a unique area in the department of Essonne, situated in a transitional zone between:

• The urban area to the north
• And the rural area to the south

Its agricultural and wooded areas, and its rivers and valleys contrast with the nearby services and equipment needed for everyday activity.

The many local businesses and traditional markets contribute to the quality of life offered by our region.

Dynamic business activity and an open-air shopping centre.


The village of Bruyères-le-Châtel is located in the heart of one of the finest areas of the Paris region, Hurepoix, which covers part of the department of Essonne between the forests of Rambouillet and Fontainebleau.

There are several areas for walking, in particular along the banks of the Orge and Rémarde rivers which both run through the village. Bruyères-le-Châtel boasts a rich natural heritage which is popular with lovers of sport and of nature.


The TERATEC Technopole

The TERATEC Centre was initiated by the CEA to develop and promote high performance digital simulation. It uses its resources to increase and spread knowledge, and to enhance skills and services in the field of intensive computing to support research, industrial companies and technology providers.

The TERATEC technopole is made up of two entities:

  • The TERATEC Campus
  • The CEA’s very large computer centre (TGCC)

The CEA’s very large computer centre (TGCC)

The technopole is designed to house supercomputers, and includes an electrical installation and a building with an IT area of around 6,500 sq.m. as well as servers designed for supercomputers and future extensions; a high speed telecommunications network with a capacity of up to 1Gbit/s for supercomputer users; a conference area with a lecture theatre seating 200.

Since late 2010, it has been home to the supercomputer CURIE (2 Pflop/s), the second component of PRACE, the European research infrastructure, hosted by GENCI and run by the operating teams at CEA.