Cities are now responsible for over two-thirds of global energy consumption and more than 70% of global carbon emissions [1]. In addition, residential, tertiary buildings and transport are the main consumers of final energy in cities. For example, in London, in 2000, 61% of the final energy was consumed by the residential and tertiary sectors and 28% by public transport [2]. In the current context of rising energy costs and the fight against climate change, reducing energy consumption in buildings and transportation is an unavoidable issue of urban production, and therefore development projects. In Paris (France), buildings consume about 35,000 GWh of energy every year (which represents the energy production of four nuclear power plants) and emit about 1,750,000 tonnes carbon dioxide equivalent [3]. Since the Climate Protection Plan was adopted in 2007, the primary energy consumption of new Parisian buildings is capped at 50 kWh per square meter of net floor area per year [4].
There is much research [5]-[9] that provides a critical analysis of the different assessment tools and frameworks existing for sustainable buildings and urban development. However, there are fewer studies focusing on developer and designer practices outside those frameworks: “literature related to the definition, criteria and application of green specifications is relatively limited” [10]. As urban projects currently cover 10% of the Parisian territory, we decided to describe how energy issues are integrated into urban development projects from the large scale to the building scale. We have chosen to study three major Parisian operations: Paris Rive Gauche, Paris Nord Est and Clichy-Batignolles.
The purpose of this article is to identify the prescriptions set by the urban developers to the building designers in our three cases studied. We analyze what prescriptions are made concerning energy quality of buildings i.e. to enhance the energy performance of the future buildings, to optimize the renewable energy production and to reduce energy consumed during construction. We therefore compared the environmental requirements made for future buildings in our three Parisian projects.
This article is organized in three main parts. Firstly, we will briefly present the cases studied and the documents containing environmental specifications and how they were produced. Secondly, we will compare their objectives and their way of prescribing. We will then focus on their content, the parameters mentioned to ensure high energy quality buildings and the control measures proposed.
We focus our analysis on large urban development projects in terms of space and time. All of them are located in Paris (Figure 1), in areas characterized by railway fields or brownfields and warehouses. They are large-scale projects (from 50 hectares to more than 200 hectares), which are developed through different subdistrict operations. These are long-term projects, which began during the 1990s or the early 2000s and are still in progress. In every case, some buildings (even some sectors in Paris Rive Gauche) have already been delivered, some are still under construction, and some still need to be designed. Therefore, all of the urban projects have to achieve the ambitious objectives of the Parisian Climate Protection Plan.
Localization of the development projects and subdistrict operations studied

We have chosen to study the environmental requirements made for buildings within these projects. For this purpose, we collected documents relating to environmental quality for the three cases. In this article, we compare the environmental specifications of two subdistrict operations for each case study. As visible on Figure 1, these operations are:
Tolbiac Chevaleret and Masséna-Bruneseau, subdistricts of the ZAC Paris Rive Gauche;
Macdonald and ZAC Claude Bernard, parts of Paris Nord Est;
Saussure and ZAC Clichy-Batignolles from Clichy-Batignolles.
Apart from the environmental specifications of ZAC Claude Bernard, all the documents we analyzed were written after 2007, after the Parisian Climate Protection Plan was adopted (Figure 2). Our comparison is enhanced by interviews with a range of project stakeholders, such as urban planners, urban developers, building developers, architects, environmental engineering firms and project managers at the City administration. These interviews have been conducted since September 2012.
Chronology of the environmental specification analyzed regarding the Parisian Climate Protection Plan of Paris

In the rest of the article, we have chosen to base our comparison on the most detailed environmental requirements, i.e. the ones made for:
The global energy consumption target is only detailed by energy consumption unit for Clichy-Batignolles. Buildings built in ZAC Claude Bernard must consume 20% less than the objective required by the Thermal Regulation of 2005, because the Climate Protection Plan was not yet adopted by Paris. The total primary energy consumption (Cpe) target set in all the requirements drafted after 2007 is the Parisian Climate Protection Plan objective: 50 kWh/m². Although, there are no calculation conventions in the Parisian climate Protection Plan, the ones used in the environmental requirements studied come from the 2005 Thermal Regulation. The energy consumption units considered in the calculation are generally mentioned and include: heating, cooling, domestic water heating, ventilation, lighting and auxiliaries. For ZAC Clichy-Batignolles only, there are precise primary energy (pe) targets for every energy consumption unit in addition to the total objective. These objectives vary depending on building functions. For example for residential buildings, the targets are:
Cpe heating ≤14 kWhpe/m²year;
Cpe DWH ≤20 kWhpe/m²year;
Cpe specific electricity ≤45 kWhpe/m²year;
Cpe private domestic uses ≤65 kWhpe/m²year.
Cpe: Consumption of primary energy
DWH: Domestic Hot Water
Greenhouse gases emission objectives are stated in specifications for Macdonald and Masséna Bruneseau only. For the first one, greenhouse gas emissions need to be evaluated per square meter built and for the second one, greenhouse gas emissions are one of the chosen criteria for energy supply sources.
All these objectives are presented in Table 1. After this first comparison, we cannot draw any conclusion about a temporal evolution of the ways of prescribing energy quality of buildings within these six urban operations. Apart from the consumption targets’ evolution due to the adoption of the Parisian Climate Protection Plan, there is no characteristic development in renewable energy production or certification requirements. There seems to be no common strategy between operations within a same urban development project. The only aspect shared between operations of a same project is the connection to the district heating system prescription in Paris Nord-Est and Clichy-Batignolles.
Comparison of the requirements in terms of energy consumption targets, building certification and renewable energy production
Masséna Bruneseau plots B1A-1 and 2 | Tolbiac Chevaleret block T7 | ZAC Claude Bernard | Macdonald | ZAC Clichy-Batignolles | Saussure | |
---|---|---|---|---|---|---|
Primary energy consumption targets | 50 kWh/m2year | 50 kWh/m2year | 50 kWh/m2year | 50 kWh/m2year | 50 kWh/m2year and a specific target for every consumption unit | 50 kWh/m2year |
Certification required | H&E (CERQUAL) | H&E (CERQUAL) | H&E (CERQUAL) | H&E (CERQUAL) | H&E (CERQUAL) | No certification required |
Renewable energy production | No quantified target; study comparing the different energy resources available on site required; installation of solar panels recommended | No quantified target; study comparing the different energy resources available on site required; installation of solar panels recommended | 25% of the final energy demand; connection to the heat network requested | 25% of the final energy demand; connection to the heat network requested | 96 MWh/year of solar electricity injected into the grid; connection to the heat network requested | No quantified target; connection to the heat network requested |
We have counted the number of prescriptions of each type to compare the strategies adopted in the six operations (Figure 3).
The different types of prescriptions made in the six operations and their distribution

Apart from the large use of prescribed actions, there is no uniformity of prescribing methods. We need to check if this variability also concerns specifications content: what are the parameters on which it is recommended to act on and how is energy quality of building projects monitored?
Architectural criteria concern the form and the orientation of the building;
Building shell refers to the thermal characteristics of the walls and roof;
Comfort and energy needs’ category includes all the requirements that focus on visual or thermal comfort;
Equipment refers to requirements focus on characteristics of ventilation, lighting, boiler, etc.;
Energy supply criteria focus on types of energy that must be used by the building;
Outdoor spaces’category contain all the criteria about outdoor spaces quality;
Materials refers to the environmental characteristics of the materials chosen;
Energy consumption monitoring refers to all the devices installed to help users to manage their consumption.
Categories of parameters mentioned in the specifications and their distribution

Over the 60 parameters mentioned, only one is shared by all of the projects: the installation of solar panels on roofs to produce domestic hot water. Only 10 parameters are mentioned in a majority of operations. This confirms that there is not only one way to ensure building energy performance.
The different recommendations made to ensure building energy performance can be grouped according to eight kinds of design choices. The parameters considered for each choice are detailed in the following paragraphs.
The ways of monitoring energy quality of future buildings during the project process are quite similar in all the operations studied. Designers taking part in the architectural competition of Masséna Bruneseau plots B1A-1&2 must describe the building shell quality, the energy concept, how they will achieve Climate Protection Plan objective, the environmental quality of their project and the results of solar studies. In Tolbiac Chevaleret, solutions chosen to ensure building energy performance must be described for the competition, and justified during preliminary design. Energy supply studies must be provided for building permit request. These data must be updated in the next steps. For ZAC Clichy Batignolles, a table must be filled out at different steps (architectural competition, front-end engineering design, submission of the consultation file and building delivery). There is also a table of indicators in Macdonald specifications, but this one needs to be filled out with the first draft, when the building permit is requested and at delivery. In Saussure, bioclimatic and architectural requirements must be specified for preliminary design and “detailed technical requirements”, when the front-end engineering is designed or the consultation file is submitted. Documents demanded at every phase of the project are listed in ZAC Claude Bernard specifications. For the architectural competition, a precise description of the project is needed. For example, equipment used, energy consumption target, wall composition, U-values, selection criteria of materials, and the share of energy demand covered by renewable energy must be specified. Energy consumption of the building and material choices have to be detailed for the consultation file submission. The peculiarity of ZAC Claude Bernard is that an evaluation is required two years after the delivery concerning energy consumption, ageing and maintenance of materials.
Finally, there are four kinds of procedures to guarantee energy quality of buildings in urban development project in Paris: energy consumption targets of the Parisian Protection Plan and of the national Thermal Regulation, specific environmental requirements and environmental certifications. Urban developers need apparently to prescribe the way to reach the energy consumption target of the national Thermal Regulation or Parisian Protection Plan. If environmental requirements drafting seems to be a widespread practice in Parisian urban development projects, there are no common methods to write them. These documents seem to be used in addition to normative procedures in order to take features of each operation into account, and so fill out the lack of the national and local regulations.
The way of prescribing energy performance varies from one project to another. We showed that this variability also affects sector projects of the same urban development project. Therefore, we can conclude that energy quality concerns do not arise at the large urban development scale. However, prescriptions about energy supply and renewable energy source choices are similar for sectors of a same project. When a district heating system is under construction in the area of the urban development project, connection of the future building to the network is required.
Most of the environmental specifications we studied are written by engineering firms working as Assistant to the urban Contracting Authority (ACA). As such, they are not involved in the preliminary urban drawing with the designer team. If most of them prefer prescribing precise actions, some do not. Architecture, building shell and energy supply are the only concerns shared by all the environmental spcecifications. However, differences in priorities from one firm to another lead to a high variability of parameters identified to ensure high building energy performance. Variability of the principles adopted in green specifications of construction organisations was already noticed by Lam et al. [10].
We can assume that the differences observed in the way of prescribing building energy performances result from the variety of context and stakeholders, and overall from the different engineering firm experiences. We need therefore to continue the interviews with environmental engineering firms to identify the variation of their methods from project to project. To confirm these results, analysis of green specifications practices from other cities or countries are needed. For the moment, too few studies have been done may be due to lack of data availability.
As there is no measurement of the effective energy consumption of buildings after their delivery, we cannot conclude on the effectiveness of these environmental requirements. Prescribing practices of the energy performance of buildings could not be improved without data on actual consumption of buildings.
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