Lyon Confluence: Kengo Kuma and Bouygues chosen to develop the ilot P

5 September 2011

The team made up by the developer Bouygues immobilier with SLC Pitance and the Japanese architects Kengo Kuma Associated supported by the Lyon CRB team was chosen, on 1st September 2011, to re-develop the 12,500 m2 of the ilot P situated at between the Cours Charlemagne and the waterside, at the heart of the first phase of the Lyon Confluence city centre project.

Four teams have been retained for the next round from 17 candidates. The jury, chaired by Gérard Collomb, senator and mayor of Lyon and Chair of Greater Lyon, underlined the quality of the four proposals which managed to juggle architectural expression and environmental innovation.

Architectural qualities of the project

The quality of the architectural design, its elegance, movement and lightness as well as the strength of the Kengo Kuma project were the factors that the jury particularly liked.

The project was devised alongside the planning recommendations from Herzog & de Meuron; the three buildings being sculptural and very expressive. The design is for an undulating pattern to the facades which are generously lit thanks to openings which allow natural light through.

Three materials have been used:

  • stone (Blue Savoy) for the offices on the corner of the Cours Charlemagne and the waterside,
  • glass for the central building which contains 42 homes,
  • wood (poplar) for the mixed use building running along the railway.

Environmental qualities of the project

On the question of environmental quality this project was adjudged to be the most high performing and the safest given the energy strategy it had adopted. The ideas were very carefully thought through as concerns bio-climate; natural light, acoustics and air conditioning in the summer.

Energy will be produced from photovoltaic sources on the roof and facades and from a cogeneration plant that uses oilseed rape from the Rhône-Alpes Region. Together they will produce 476 MWh, which equates to the energy requirements of 160 homes.

Close cooperation with NEDO

The whole project is founded on close cooperation with NEDO and the integration of technologies developed by Toshiba have been tested using very advanced simulations. NEDO has underlined the importance of the work undertaken with Bouygues in the preparatory phase for the design of a system able to reach the ambitious targets set by a positive energy building.

Towards a new generation of 'intelligent' buildings

A decisive step has been taken, said the jury, on the way to creating a new generation of intelligent buildings; energy produced by the offices can be used by homes at the weekend and users will be made aware of how to use this technology to save energy and to find the best balance between the production of renewable energy and its consumption, underlined the head of Bouygues Immobilier.

In this project, Kengo Kuma wanted to "be inspired by nature to produce transparency" and therefore gave natural light pride of place.

Find out more

The three teams in the running were the following:

  • Shigeru Ban and Rue Royale architects in association with the developer ICADE
  • Dominique Perrault and the Barcelona agency Mateo Arquitectura, in association with Vinci Bernard Reichen and
  • Barbosa &Guimaraes (Portugal) in association with Altarea Cogedim.