Optimization of Montigny-lès-Cormeilles's real estate assets - 51,600 m²

Background

The town of Montigny-lès-Cormeilles (95) has undertaken a proactive approach to energy modernization of its real estate assets. Its property portfolio represents 51,600 m² spread across 33 buildings for various uses (schools, town hall, community centers, sports complexes, community and cultural buildings, etc.), managed by a single maintenance provider. Faced with non-compliance with the BACS and Tertiary decrees, the community sought to implement a smart energy management system to improve the overall performance of its buildings.

Challenges

The community was facing several major issues:

👉 Regulatory non-compliance (BACS and Tertiary decrees)

👉 Overconsumption linked to performance deviations not detected upstream

👉 Scattered and unreliable energy data

👉 Budgetary constraints requiring a funded solution

👉 Need to collaborate closely with the existing maintenance provider

👉 Desire to retain full ownership of its energy data

Solutions and Objectives

Accenta deployed a tailor-made solution to ensure regulatory compliance while providing powerful energy management tools:

✅ Installation of Class B building management systems in the 13 most energy-intensive buildings

✅ Deployment of hypervision software to monitor consumption across the entire portfolio from a centralized platform

✅ Implementation of smart alerts for the maintenance team to quickly identify malfunctions

✅ Regular digital rounds conducted by Accenta’s Energy Management teams, in addition to the maintenance team’s interventions

✅ Secure contractual framework, via an 8-year co-contracting agreement with ENGIE Solutions, ensuring lasting alignment between all stakeholders

✅ Full project financing by Accenta, for implementation with no impact on the local authority’s budget

Expected results:

✅ Compliance with regulatory requirements (BACS decree),

✅ Measured reduction in energy consumption and CO₂ emissions ranging from -13% to -34% depending on the building,

✅ Improved comfort, responsiveness, and long-term energy performance.