Omexom C&S and Omexom Göteborg are working on two BESS projects in Sweden on behalf of the energy firm Centrica. This Franco-Swedish partnership is combining technical expertise and local knowledge to enhance network stability ahead of increases in renewable energy production.
Two VINCI Energies business units – Omexom Göteborg Renewable Energies and Omexom C&S (Conversion & Storage) – have joined forces to deliver two turnkey BESS (battery energy storage system) projects in Bullerforsen and Romme, two towns in Dalarna County in central Sweden.
These two 20 MWh systems created for the British energy company Centrica will improve the stability of Sweden’s network in a context of high market penetration by intermittent renewable energies. When operational, their combined capacity of 40 MWh will store enough electrical energy to supply 20,000 households for one hour.
Advanced complementary skills
This partnership marks the first collaboration between the two entities from Omexom, the VINCI Energies energy infrastructure brand, and also with Centrica. Thibault Fauquant, Business Unit Manager at Omexom C&S France, says: “The initial contact with Centrica was made in Sweden, and we ultimately formed a partnership. We bring our specialist expertise in BESS, while Omexom Sweden brings its valuable local experience in the execution and operation of projects.”
Storing enough electricity to supply 20,000 households for one hour
This synergy between the two business units is based on advanced and complementary technical skillsets. BESS projects require detailed electrical engineering and network regulation expertise, but also the ability to design integrated systems combining batteries, inverters, transformers and automation solutions. Omexom C&S will be responsible for supplying and designing the equipment to meet performance criteria relating to product life, responsiveness and storage capacity. Omexom Göteborg will manage on-site execution, including civil engineering, component assembly and electrical installations.
Fieldwork challenges
This Franco-Swedish project will take 16 months, with commissioning scheduled for the end of 2025. Despite harsh, wintry conditions, the teams kicked off the civil engineering work in spring 2024. Kristoffer Ekman, Business Unit Manager at Omexom Göteborg Renewable Energies, looks back at the fieldwork challenges: “Besides the cold and snow, one of the predictable challenges for this project was the noise from the fans. We expect to complete all work on the site by the autumn.”
Omexom Göteborg has already been involved in the installation of 100 MWh of battery storage in Sweden, and is profiting from its experience and specialisation strategy. “We have acquired valuable expertise through working on substation projects, which have similarities with BESS,” explains Kristoffer Ekman (read his portrait).
International club
An international storage and flexibility club also launched recently, led by the two business unit managers. Its aim is to pool expertise from across the Omexom network in the field of battery energy storage. For Kristoffer Ekman, this project is only the beginning. This Franco-Swedish pairing embodies a winning strategy of internationalisation and technological innovation while also meeting increasing needs for flexibility across European networks.
The network stabilisation challenge
The BESS installations, designed in this case for a one-hour discharge time, play a key role in stabilising the network’s frequency. By storing excess energy produced from renewable sources and redistributing it at just the right time, they reduce losses, underpin auxiliary services and improve network resilience. But they do require advanced software integration to facilitate dynamic management in real time.
02/16/2026
