The photovoltaic power plant of the Hôtel des Postes in Nantes
Last modified by the author on 24/03/2021 - 11:33
- Year of commitment : 2021
- Address 1 - street : 2 place de Bretagne 44000 NANTES, France
- Diameter : 1300
- CO2 Impact : CO2 avoided / year: the equivalent of 174 Paris-Marseille round trips by car
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400 000 €
The Hôtel des Postes de Nantes is located in the heart of the city, Place de Bretagne. The building underwent an energy renovation on an occupied site, an overhaul of the entire heating system, and above all the installation of a 1,400m² photovoltaic plant on its roof , made up of 715 panels. The declared power of the plant is 255 KWp and the average annual producible is 274,900 Kwh.
The building participated in the R2S label test as a pilot project, which attests to the capacity of buildings to accommodate digital services. The power plant project benefited from the SMart Ideas to Link Energies (SMILE) system, which was able to provide it with visibility and contacts on issues of self-consumption and digital transition.
Energy efficiency and self-consumption
The renovation works and the power station are part of the La Poste group's energy policy. This mainly involves securing the energy supply to the group's buildings and reducing their vulnerability to rising electricity costs by increasing self-consumption. The power plant should make it possible to cover 13 to 15% of the building's energy needs. 95% of the energy produced is consumed on site, as shown by the preliminary feasibility studies carried out upstream of the installation of the final plant.
In parallel with the installation of the power plant, Poste Immo is also working on reducing the building's energy needs . The various energy works carried out for several years aim to reduce these needs by 24% (insulation of a wing of the building, overhaul of the heating and lighting systems, installation of a BMS).
Install a power plant on built heritage, in the city center
Originally, Poste Immo wanted to make a central visible, which could be identifiable in particular through overhangs. However, the ABF gave an unfavorable opinion to this first version of the project. The power plant finally adopted is positioned on flat roofs and therefore has fewer panels. These are black in color, so that they visually blend into the roof. There was no need to carry out major work on the building to install the power plant: the existing post-beam concrete structure could quite support the weight of the panels (around 16 to 20 kg / m²).
Project replicability
The objective of installing this plant is also to find an economic and legal model that can be replicated on other buildings in the group . Poste Immo has chosen to make the power station available to the occupants of the building, against a fee. The latter can thus acquire the status of producer-consumer, necessary for the qualification of individual self-consumption (see governance tab).
The experience acquired during the Hôtel des Postes de Nantes project will be invaluable for future projects on other buildings.
Progress Status
Delivered
Data Reliability
Self-declared
Funding Type
Private
Website Enterprise / Infrastructure
https://www.poste-immo.fr/Sustainable Development
- a building management system
- installation of a weather forecasting system coupled with a production forecast from the power plant
- user reporting via a specific web page providing the following information: Weather forecast / Instantaneous power produced by the solar plant / Plant production forecast / Self-consumption and self-production rate / Recall of historical information (energy produced last week , self-consumption / self-production rate) / Recommendation of best practices to be adopted to improve self-consumption
Governance
- Poste Immo : client
- Egis Conseil: prime contractor for the photovoltaic power plant and the repair of the waterproofing
- Soprema: complete repair of the waterproofing with insulation of the roof
- Solstyce: carrying out installation work for the power plant
- Combaluzier-Stoll Architecture: intervention on the power plant
Immo station
Private Company
Private
Speakers:
Poste Immo makes the central available to the occupants of the building against a fee. This allows occupants to have the status of producer-consumer, necessary for the qualification of individual self-consumption.
At the economic level, the cost of the charge is offset by the reduction in the energy bill induced by the use of energy produced on site. This type of assembly makes it possible to rent the equipment both to occupants who are members of the La Poste group and to partner occupants.
Poste Immo
Sustainable Solutions
- Renewable energies
Longi LR4-60HPB 360 Wc
High efficiency 360 Wp monocrystalline photovoltaic panel.
Photo credit
Valery Joncheray
Reasons for participating in the competition(s)
The project of the photovoltaic power station of the Hôtel des Postes de Nantes presents several major advantages in the competition:
- It shows that it is possible to install a power station with a large number of photovoltaic panels in the city center, fitting into the urban landscape.
- The project is based on self-consumption. In doing so, it promotes the energy resilience of the building and limits its vulnerability to changes in electricity prices.
- The project integrates the challenges of digital transition in buildings (participation in R2S label tests and in the SMart Ideas to Link Energies system)
- The economic and legal model developed by Poste Immo around the power plant to obtain the qualification of individual self-consumption is an inspiring model that can be replicated for other projects of the same type.
- The installation of the power plant is part of a more general reflection on reducing the building's energy consumption: renovation work has also been carried out by Poste Immo on the Hôtel des Postes.
Building candidate in the category
Grand Prix Infrastructure Durable
antony GUILBERT-CHOLET
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