Water expertise France

Drinking water

PROJECT / Towards energy efficiency for sanitation services with the Greater Paris Sanitation Authority (SIAAP)

Drinking water

Drinking water ( 28 posts )

the Greater Paris Sanitation Authority (SIAAP)

City, Country: 2000km2 in the Seine basin, France


French partner submitting the project description: the Greater Paris Sanitation Authority (SIAAP)

Project Owner: the Greater Paris Sanitation Authority (SIAAP)


Dates of project: since 2007


A few words on the project…

 The SIAAP’s measures are a strong example of the vast choice of actions that water and sanitation services can implement in order to contribute to a sustainable development, taking into account climate change.


Background or General project description

The urban, demographic and economic growth of the greater Paris area experienced by all political and institutional players will inevitably have environmental consequences, including on water quality. Repercussions on water treatment costs are expected in response to the deterioration of its quality and these treatment processes are energy-intensive and emit greenhouses gases.


French Expertise

The SIAAP is the only interdepartmental water and sanitation authority in Europe. Each day it transports and treats 2.5 million m3 of wastewater, rainwater and industrial from the greater Paris area.

The SIAAP has developed a sustainable development policy structured around a five-fold


1) Contributing to the sustainable management of the greater Paris area ;

2) helping to improve the living environment and health ;

3) paying careful attention to social and societal expectations

4) preserving natural resources ;

5) responding global warming.

As part of this strategy, the SIAAP implements a variety of initiatives every year, from water-saving programs to adapt to rain variability to mitigation through improving the energy efficiency of its processes and infrastructure.


For example, in order to identify areas for improvement and to assess its mitigation efforts within the framework of its sustainable development strategy, the SIAAP developed its own measuring tool for greenhouse gas emissions. This tool is used in its six wastewater treatment plants.

The SIAAP is now capable of conducting its own overall assessment of GHGs and identifying the stages of its operations that emit the most pollution. This tool is also a decision support tool for the investment projects selected by the SIAAP.


The SIAAP also develops ways to improve the energy efficiency of its wastewater treatment plants, which is a key driver for mitigating the effects of climate change in water and sanitation services. Over time, its motors will be replaced with more efficient motors and variable speed drives will be added to optimize energy consumption according to real-time needs. The SIAAP takes advantage of regulatory incentives in the form of energy savings certificates offering financial benefits in order to invest in more efficient equipment.

Using the GHG measurement tool it developed, the SIAAP is able to monitor non-negligible impacts that affect nine million users in the Ile-de-France region. As a result of the energy efficiency retrofits carried out on its plants in 2013, their emissions have dropped by more than 25%.


Strengths of project

The sustainable development strategy focuses on the long term, it concerns all SIAAP activities and forms part of the concept of promoting urban ecology by implementing local synergy aimed at developing the thermal potential of effluents or generating power from non-fossil fuels.


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