City of Clermont-Ferrand Reduces Street-Light Operating Costs by 40% per Annum with Sogexi and Sierra Wireless

Quick Facts


City of Clermont-Ferrand

Customer Profile

Sogexi has over 30 years of experience and innovation in the field of street lighting backed by international patents. The City of Clermont-Ferrand has deployed Sogexi street lighting telemanagement system across the municipality, with over 16,000 lights in operation. 

  • Improve maintenance of lighting infrastructure
  • Reduce energy consumption
  • City able to be proactive in maintenance and energy efficiency
  • Annual energy savings estimated to be at least 35%
Sierra Wireless Products & Services
  • AirLink® devices monitor control units and provides remote connectivity
  • Data sent to AirLink® Management Service (ALMS) and provided to other applications for further analysis
  • Devices can be remotely managed and configured to provide optimal lighting based on time of day and day of year


The City’s goal in deploying the Sogexi infrastructure was to improve overall maintenance and reduce energy consumption. Although the solution was designed to interface with the city-wide fiber optic network which connects all access controls for public buildings and variety of smart applications, the City determined that doing so would be cost prohibitive and asked for a wireless solution.

Challenge & Results​

Sogexi, who was awarded the contract by the City in 2011, had already been working with Sierra Wireless for several years to integrate an AirLink® programmable modem into its solution to provide wireless access. In such a solution, host processors are housed in control units across the city, which aggregate groups of streetlight fixtures and are able to control every individual street lamp. The AirLink device monitors the control unit and provides remote connectivity, allowing the data to be sent over the cellular network to AVMS, which stores all the data and presents it to various applications and users for action. The City is now able to monitor all 16,000 streetlight fixtures and notify maintenance crews almost immediately of any problems. While maintenance crews once relied on visual reports of problems and then corrected them, typically in a week, the reporting of issues happens automatically and in real time and can be corrected within a couple of hours.

With electronic control of the streetlight network, the City can leverage Sogexi management platform (based on AVMS) to configure all the fixtures based on time of year and time of day or night. For example, during the week, the City can configure lights to operate at 50% or less capacity from 22:00 to 06:00 am; and during the weekend, to operate at 75% capacity from 22:00 to 0:00, and 50% or less from 0:00 to 06:30 am. The estimated energy savings that have resulted from the overall system deployment is 35% per year, and even higher financial savings.

A City representative explained that the municipal technical services team now manages and controls the complete streetlight system, and is considering other monitoring applications using this infrastructure. “Energy prices are continuing to increase, and being able to match lighting to behaviour allows us to reduce our overall costs and impact on the environment”, said Sarah Bastide, street lighting/parks/traffic lights manager for the City.

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The deployment of the Sogexi streetlight management system with Sierra Wireless AirLink devices has allowed us to be proactive in our energy savings plan and maintenance efficiency. The real-time monitoring and reporting of outages provided by the AirVantage helps us to be proactive with maintenance, which improves overall safety for our citizens.

Dominique Colinot
Street Lighting Network Manager, Sogexi

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