green energy project to feed tunnels lighting

More than 800 solar panels were commissioned in North Vienna in Austria to light three tunnels of the motorway operated by Bonaventura Services GmbH, a subsidiary of Egis.

Supporting regions in transition

To best support your regional projects, we have built a truly multi-cultural team. Our consultant’s strategic vision combined with the technical expertise of the engineer, means you will receive bold, pragmatic advice to help you address the major challenges of this period of energy and ecological transition.

Beyond the objectives of economic sustainability and regulatory compliance, there are new challenges to face when both converting existing buildings and developing new projects. Changing uses, urban integration, energy and resource efficiency, among others, make it crucial to implement a holistic approach. Of course, our regions must be smart and efficient, but let’s also make them pleasant, healthy, responsible and supportive, by uniting residents and economic players in a collaborative movement towards resilience and community.

© Thinkstock – ACH-DP



+ Regional Diagnostics
+ Proposal of transition scenarios
+ Modelling of energy systems (needs, productions, networks)


+ Completion of Bilan Carbone® reports
+ Development of 2°C pathways


© ACH-DP – Thinkstock+ Assistance with project development
+ Data Mining & Machine Learning
+ Connected objects and smart meters
+ Data governance
+ Service design


+ Energy audits
+ Heritage Master Plans
+ Energy management


+ Feasibility study
+ Monitoring of operations


+ Material reuse in construction
+ Ecodesign
+ Industrial and commercial ecology
+ Product-Service System strategy


+ Management of action plans
+ Mobilisation of local players
+ Creation of communication and training plans
+ Innovation management

Sensors on trams to measure and geolocate air pollution

GreenZenTag: This first large-scale test of its kind in France brings together Egis, Transdev, SEMITAG and start-ups over a period of 18 months. The results of the experiment will help public authorities and residents to make better decisions regarding travel strategies and behaviours to be adopted during pollution peaks.


© SEMITAG – P_Paillard

Egis’s role in GreenZenTag is to analyse the data collected. Teams verify and validate this data, establish averages for each zone and prepare mapping and associated dashboards. Egis has also introduced a comparison between data from mobile sensors and its own, using a combination of fixed sensors and modelling.

Egis retrieves the raw data and turns it into a GIS database* for measuring air pollution concentration by zone. The data is then compared with that gathered by fixed sensors and information from Atmo Auvergne-Rhône-Alpes models. Egis establishes a map of the data and produces dashboards. The company shares its analyses with Atmo Auvergne-Rhône-Alpes (Authorised Observatory for monitoring and information on air quality in Auvergne-Rhône-Alpes). The observatory will assess whether such an approach is likely to bring added value to its work or whether it may be beneficial for regions that are yet to have a measurement and information system in place.
* GIS database: information system designed to collect, store, process, analyse, manage and present all types of spatial and geographic data.

Read the press kit (french version) to find out more (December 2016)

Strategic study: PARIS is entering a new era: towards carbon neutrality in 2050


Cities aspiring to carbon neutrality recognise that to prevent the worst effects of climate change, greenhouse gas emissions must be reduced by at least 80% by 2050. Because urban areas account for nearly three quarters of emissions from people, the achievement of this objective will depend largely on our ability to re-imagine and re-invent the cities to promote economic prosperity, social equity, quality of life and climate resilience.

Ahead of the future revision of its Climate Plan, the City of Paris is leading the way with the launch of a strategic study for the achievement of a low carbon vision of Paris by this date.

The Elioth group, an Egis entity specialising in R&D and EPCM of low carbon innovations (agent), combining Quattrolibri[1], the Egis Consultancy teams, and Mana[2] has assisted it in this study, allowing the Paris City Council to have an external, independent and impartial view of the issues to consider. The measures proposed by the group should open the debate for a transition to a low carbon city and provide a vision shared by all its inhabitants.


This carbon neutral strategy called for cutting-edge technical and scientific work, both to make the pathways to this reduction more concrete and to model the changes in compensation and sequestration of residual emissions. The major objectives are:

  • Transport and Freight: 75% reduction in emissions including -85% for personal mobility
  • Consumption: 70% reduction of emissions through food, goods and waste
  • Buildings: 75% reduction in emissions including -80% for housing
  • Energy: large scale solar-powered heating both within Paris and outside the city

To achieve this, the group has proposed the implementation of flagship measures, including:

  • 6 million square meters of solar roofs
  • Renovation of up to 75% of the existing housing stock
  • 150 hectares of urban agriculture
  • 75% semi-vegetarians (or flexitarians) in 2050 (diets with a lower content from animal sources, favouring “vegetarian, local, seasonal”.)
  • Halving of the household waste per capita
  • Half the number of cars, and twice as full, in shared mode
  • A massive shift to electric cars
  • 52 weekends without cars per year by 2050
  • Transformation of the ring road into an urban boulevard
  • 5 times more cargo travelling via the Seine


The conclusion of the group is unambiguous: the prospect of achieving carbon neutrality is within reach of the Paris City Council. That prospect justifies all the energy and vitality of its recommendations but also the radical nature of some of them.


TO FIND OUT MORE:  The dedicated website:  + Interviews (Expert’s point of view) +

Comprehensive report  (316P.) + Conclusions (2 P.)

[1] Quattrobibri

[2] Mana



Preventing flood risk

Because of climate change, urban concentration and specific geographical or climatic characteristics, flood events are becoming more frequent and devastating for people and for the environment.

Projections by the United Nations Development Programme show some 2.5 billion of people will be vulnerable to floods in 2050…

It is essential to identify and assess the flood risk to be able to implement the structural measures (defence works against floods, warning systems and flood forecasting) or regulations (prevention plans and risk management) that will limit its effects.

For many years, Egis has been developing skills and resources that meet the technical and institutional requirements of flood protection

This technical expertise relies upon and benefits from local knowledge, to obtain a diagnosis shared by as many parties as possible, including not just policy makers and financial backers, but also the people themselves and economic stakeholders.

A sound protection strategy needs to integrate a wide range of requirements: economic, land development, social priorities and environmental protection.

It is precisely this comprehensive approach that Egis favours in its studies and action plans:

  • Blueprints for waterway development,
  • Hydrological and hydraulic modelling,
  • Mapping of flood zones,
  • Flood protection development,
  • Stormwater drainage infrastructure,
  • Cost-benefit analyses,
  • Rising water level warning systems,
  • Measures to reduce vulnerability,
  • Contingency plans and crisis management.

Project to rehabilitate the network for collecting and draining rainwater in Port Gentil, Gabon. A project to reduce flood risk and improve safety for residents

Port-Gentil is a coastal city in the north-west of Gabon. It is also the economic capital of the country which produces
about three-quarters of its wealth with an oil industry and wood industry.
The problem of stormwater drainage in Port Gentil is due to a flat landscape, proximity of the sea and the water-table
very close to the surface. The existing infrastructure is largely inadequate and in very poor condition.. In consequence,
when it rains, the city regularly experiences floods that put its population and services at risk.
Aware of of the importance of what is at stake, the Agence Française de Développement (AFD) and the Gabonese
government have put in place funding to rehabilitate the existing collection network and drain the city’s rainwater.

Flood risk/some key Egis Group references:

  • In France: protection against rising water levels in the Isère area: Read the Egis Contact article “Halte aux crues de l’Isère” – (hydraulic, environmental and landscaping works, €87 million) (Engineering, Procurement and Construction Management)
  • Anti-flood hydraulic development in the Bassée sector, upstream of the Seine-Yonne confluence, Egis, in consortium with Ashurst, has ensured the continued operation of the project – to find out more
  • Montpellier, France: Construction of anti-flood dykes on the river Lez (Engineering, Procurement and Construction Management)
  • Nice, France: Development scheme for the Grand Arénas neighbourhood on the edge of the river Var. Blueprint for hydraulic consistency (general studies)
  • Lambersart, France: Guy Lefort rainwater storage basin (buried under the stadium’s sports infrastructure, 28,000 m3, depth of 20 m and 45 m in diameter). Engineering, Procurement and Construction Management.
  • Gujarat State in India: Combating floods in the state of Gujarat. Advice and general studies for establishing a comprehensive flood warning system.
  • The Maritza and Tundja rivers in Bulgaria and Turkey – Disaster prevention related to rising water levels in the border region between Bulgaria and Turkey. Technical assistance for the development of a forecasting model and a flood warning system.




This is the aim of the future WtE facility designed to recycle organic waste using anaerobic digestion and gasification, on a former disused quarry in the town of Gouvieux, near Chantilly (Oise, France). Egis  is responsible for the project management consultancy for this regional environmental project, as part of a circular economy approach: creation of a solution for recovering/recycling horse manure generated by regional stud farms and breeders, as well as green waste from nearby communities.

The unit will implement the following recovery and recovery techniques:

  • Anaerobic digestion of 30,000 tonnes per year of equine manure on straw, along with green waste, for an output of 5 MW of biogas, which will be injected into the GRTgaz network.
  • Gasification of 9000 tonnes per year of equine manure on chips and woody green waste, generating 3 MW of thermal energy.
  • Recovery and reuse of digestate (2) to produce a marketable organic soil conditioner.


The project management consultancy assignment will focus on the operational phase of creating the final detailed design, followed by construction and handover, as well as startup of the facility.

(2) Digestate: is the material remaining, or “digested” waste, after the anaerobic digestion of organic waste. Digestate is made up of excess bacteria, non-degraded organic matter and mineralised material. After treatment it can be used as compost.




District heating and cooling networks at Paris Saclay Campus

Deep geothermal energy to power the entire Paris-Saclay

The Paris Saclay Urban Campus is a major project in Greater Paris. With the planned 1.74 million sqm construction, it combines scientific ambition, economic development and sustainable management to strengthen the city’s position among the global centres of innovation. This is a unique opportunity to develop a new energy model and make Paris Saclay an Eco-Area. Establishing a smart grid for low temperature cooling and heating using deep geothermal energy will help make Paris Saclay a positive energy area.

What our stakeolders tink

“This new network plays a key role in the strategy to make Paris Saclay a green area. The deployment of this solution on such a scale will be a world first”

 Pierre Veltz, Chairman and CEO of EPAPS (Etablissement Public d’Aménagement de Saclay)

An Energy Transition plan

A solution in line with the energy transition law and COP21 to move from a society with high fossil fuel consumption to a society that is more energy and carbon efficient.image-saclay

  • A solution that has a carbon footprint three times lower than conventional gas heating
  • Savings close to 20% for the subscribers

The project led by EPAPS is one of 11 winning projects in the “Industrial demonstrators for the sustainable city” call for projects, launched in October 2015 in preparation for COP21. The aim of this call for projects was to select operations intended to become a showcase for French excellence in sustainable development.

The Egis/IDEX[1] consortium won the seven-year contract awarded by EPAPS with a transfer of skills to Design-Production-Operations & Maintenance (CREM) for the provision of heating and cooling in both joint development zones[2]. Egis is involved in the design, project management and turnkey implementation of the network within the scope of its association with IDEX.

The Egis/IDEX group proposed a temperate network via a geothermal doublet[3] in Albian[4] powering the blocks’ substations (distributed generation). This provides heating and cooling to the blocks, thus avoiding the need for extra/emergency gas resources in the buildings of the lessees. This system is also able to adapt to changes in the programme at block level.

In the block sub-station, the thermo-refrigerating pumps are designed to cover at the very least the entire chilled water needs for their block. To evacuate their surplus cooling or heating power to the temperate network, the block substations are equipped with heat exchangers. One exchange unit will evacuate the excess cooling power and another the excess heating power. This latter unit will have a dual function because if the requirement for heat is greater than the block’s production capacity, it will also provide extra heat. In these circumstances, the delivery temperature of the temperate network is raised in order to supplement the heat production from the thermo-refrigerating pumps. This temperature increase, which may reach 105°C, will be controlled via the smart grid. It will be activated by the operating team, during the installation process, with regard to projected demand curves.

[1] IDEX: to find out more (french website)

[2] Corresponding to two strategic districts on the urban campus: that of Vauve (Polytechnic college) in the towns of Palaiseau and Saclay, and that of Moulon in the towns of Gif-sur-Yvette, Orsay and Saint-Aubin.

[3] The doublet technology helps protect the environment and ensure the sustainability of water resources. It consists of two boreholes, one for production and one for the re-injection of thermal water into its original water table.

[4] The Albian aquifer measures over 100,000 km², with an average depth of 600 m, protecting it from surface pollution. Its estimated temperature of between 25°C and 28°C makes it a vital source of geothermal energy. The Albian water table extends beneath the entire Paris Basin.

Deep geothermal energy to meet demand for heating, hot water, air conditioning and cooling


Users by 2021
  • 2100 Student homes
  • 2400 Family homes
  • 520,000 sqm Higher education, research, economic development and public facilities
Production and consumption
  • 37 MW Maximum heating power output
  • 10 MW Maximum cooling capacity
  • 40 GWh Annual  heating energy supplied by the network
  • 10 GWh Annual cooling energy supplied by the network
Environmental performance
  • 37 MW Maximum heating power output
  • 10 MW Maximum cooling capacity
  • 40 GWh Annual  heating energy supplied by the network
  • 10 GWh Annual cooling energy supplied by the network

Significant benefits

Added value for the environment Added value for the economy Added value for society
  • Re-using the geothermal resource (geothermal water at 31°C)
  • Renewable energy coverage rate (62%)
  • Scalable networks for medium-term re-use of waste heat[1]
  •  Operation of thermal Smart Grid-type networks (optimised management of production tools in accordance with demand)[1] Waste heat: heat generation derived from a production site, but where this is not the primary purpose, and which, as a result, is not necessarily re-used (for example, services buildings that house data-centres whose waste heat is not re-used).
  • Cold production at block level is more efficient than standalone systems for each building
  • Reduction of consumption (very low-temperature heat distribution network, over-insulation of underground pipes, etc.)
  • Consideration of equipment maintenance during the design phase
  •  Longer lifespan of equipment
  • Lower energy bills for tenants and landlords
  • Deploying a solution on this scale will be a world first, making Paris-Saclay a showcase for formidable technological endeavour.

Eventually, the network will supply all the campus buildings built between 2016 and 2022

District heating and cooling in Asnières sur Seine - french town
The Z.A.C. Business Park in Asnières is being made into an eco-district. Egis is in charge of designing a heat network based on geothermal energy, alongside Eiffage Energie, which will operate it. It is a turnkey Egis project (design, construction, financing, operation and maintenance) for a developer consortium. In 2022, the network will supply 1,730 homes, a retirement home for the elderly, 4,900 sqm of shops, 30,000 sqm of offices, a school and a nursery.

  • Over 60% of distributed energy will be from geothermal power
  • A network that can adapt economically to the business park’s development over 48 months
  • A scalable project that can extend beyond the needs of the area.

Clim’Elioth, a proprietary eco-design tool

Exploring possibilities for optimising energy and comfort in buildings

It is designed to assess a building’s energy needs, then to suggest and optimise the various architectural and technical options through related studies. From the beginning of the design and construction phase, it is possible to evaluate buildings’ energy requirements and to make various assumptions about the possibilities of natural ventilation, air conditioning, heat exchangers, the heat recovery percentage for a double-flow heat pump, and more. This tool becomes a design guide for limiting a building’s energy consumption and needs, whether it be new or under renovation.

The Clim’Elioth software has the advantage of providing a comprehensive energy and climate approach for an architectural project in a small period of time, necessary in the early stages of design. So it saves time when it comes to establishing the potential of bioclimatic design. It is simple, fast and responsive. The software can only study one area at a time, which means that either one room or the entire building is modelled, so it provides an easy characterisation of the geometry of the building and its physical properties.

In terms of calculation, Clim’Elioth carries out an hourly assessment of the energy exchanges defined by the input data and meteorological data for the defined area, limiting itself to the needs assessment. This then results in a variety of charts used to observe the building’s thermal behaviour from an hourly to an annual basis.

In summary, the Clim’Elioth software allows for:

  • easy characterisation of the geometry of the structure and its physical properties
  • an evaluation of a building’s thermal behaviour
  • results to be processed in a relevant way
  • all kinds of parametric studies
  • an assessment of the many architectural and technical solutions of a project from an energy point of view, right from the early stages of a project


It is possible to reduce cooling needs and choose cooling methods with lower impacts:

  • Densifying ground vegetation.
  • Choosing materials with high albedos (limiting the absorption of solar radiation).
  • Controlling anthropogenic heat generation.
  • Reducing internal heating in buildings.
  • Facilitating access to district cooling systems
  • Developing geothermal energy on shallow aquifers and energy geo-structures.
  • Relying on “thermal smart grids”.
  • Encouraging the development of alternative cooling systems for buildings.
  • Contributing to the sharing of feedback.

The study seeks to describe solutions at several levels, from the building to the urban space, not to mention the essential awareness raising among stakeholders and users of the city.

FeelEgis, for retrieving time-stamped and location-based data on urban comfort

FeelEgis is a smartphone app that enables the recovery of time-stamped and location-based data on urban comfort, available on internet maps.

The principle: users enter an appraisal of external comfort following the indicators defined (noise, odours and pollution, wind, sunlight) in a given place at a given time. This measurement tool thus allows for the centralisation and capitalisation of spatial and temporal data and the crowd-sourcing of information. The aim of the app is to then use this data to help diagnose a property, region, etc. Egis, through its Elioth brand, is developing versions dedicated to a given region on request, with specific measurement fields and suitable spatial resolution.

FeelEgis is an app designed by Elioth. Available from the Apple Store and Android Market (french website)

Feel Egis

Transforming a water tower into an “Urban Thermal Battery”

Transforming a drinking water reservoir into an urban “tank”, storing thermal solar energy and distributing it in winter for the area’s heating needs.

chateau d'eau solaireAt the heart of a neighbourhood currently undergoing renovation, the building, built in 1936, hasn’t been operated by the Syndicat des Eaux d’Ile-de-France for five years. It is in this context that in late 2008, the firm ELIOTH(1) responded to a call for ideas launched by the city for a sustainable use of the structure by proposing an original idea: transforming this drinking water reservoir into an urban “tank”, storing thermal solar energy and distributing it in winter for the neighbourhood’s heating needs.

This principle is strikingly simple, yet is the first of its kind: without the existing infrastructure, the idea of aboveground storage had always been hindered by the costs of building a tank and its supporting structure. But all it took was to install a hot-water circulation loop to supply the district’s main boiler, located just 100 metres from the water tower, and the entire system is automatically regulated according to need using temperature sensors. In terms of efficiency and performance, the study results are promising. The incorporation of 500 sqm of thermal sensors in the tank, along with the storage capacity of the water tower, means it can cover two thirds of the heating needs of the 65 future homes built in the area (low-energy housing) and supply almost half of the domestic hot water needs of more than 200 rehabilitated homes. With the quantity and compactness of the amount of water contained in the tank, a level of insulation equivalent to that of a new building is enough to maintain the water at a high temperature (70°C) until winter.

(1) Elioth, an Egis entity specialised in innovative structures, building envelopes and environmental design