Envision Energy has been selected by Kallista Energy to execute an Engineering, Procurement and Construction (EPC) contract for an energy storage project located in Saleux, in the Hauts-de-France region. This project has a total capacity of 120 megawatts (MW), delivering up to 240 megawatt-hours (MWh) of electricity using Lithium Iron Phosphate (LFP) batteries. It represents Envision Energy’s first independent battery energy storage contract signed in the French market. Construction work on the site is expected to begin in June 2025.
Technology and infrastructure used
The Saleux site will employ technological systems from Envision Energy to provide frequency regulation services on the reserve markets of the electricity transmission network managed by Réseau de Transport d’Électricité (RTE). The company will specifically supply 44 direct current (DC) units and 22 alternating current (AC) units, as well as power conversion systems (PCS). These units will be integrated into the French grid to improve the management and stability of regional electricity supply.
Battery cells (LFP) will be provided by Automotive Energy Supply Corporation (AESC), a Japanese company operating a Gigafactory since June 2025 located in Douai. This factory has an annual production capacity of 10 gigawatt-hours (GWh) of battery cells, primarily intended for the European market. Selected equipment meets the technical requirements needed to provide reliable storage capacity for the local electricity grid.
Long-term maintenance contract
In addition to the initial installation, Envision Energy will also provide long-term maintenance for the Saleux project through a Long-Term Service Agreement (LTSA) of at least 14 years. This contract ensures the proper functioning and availability of the installations in the long term, enabling the company to maintain an operational presence in the Hauts-de-France region beyond the initial construction period.
The project represents a significant milestone for Envision Energy, which continues to expand its operations in Europe with battery storage solutions. The company has already completed several similar projects on the continent, strengthening its experience in advanced, integrated, and independent energy storage solutions.
European context of energy storage
Development of battery-based energy storage solutions is experiencing considerable acceleration in Europe, driven by the increase in intermittent renewable energy sources requiring complementary grid management resources. Projects similar to Saleux are multiplying, strengthening the technical capabilities of European grids to integrate these new energy resources. Power operators, along with technological sector players, continue to invest in the development and implementation of advanced technical solutions to meet these new infrastructure energy needs.
Henry Peng, Executive Vice President and President for Latin America and Europe at Envision Energy, stated that the Saleux contract marks a significant milestone in strengthening the company’s presence in the French market, contributing to developing regional energy grid stability with innovative energy storage solutions.
