France-based IT services provider Cyllene has developed the RC-DC4/5G “Cyllene Box”, a networking device for PV power plants that manages multiple internet connections, encrypts data and supports compliance with the European Union Network and Information Security Directive (NIS 2).
Cyllene has developed the RC-DC4/5G box, a device that can manage multiple Internet connections while encrypting data and facilitating compliance with the European Union’s Network and Information Security Directive (NIS 2). Recent warnings from the European Solar Market Council and SolarPower Europe have highlighted a growing concern: the cybersecurity of PV installations.
“Solar and wind farms, and broader renewable energy infrastructure, rely on increasingly distributed networks to collect data on plant productivity, outages and other factors,” said Anthony Le Fauconnier, a sales engineer specializing in managed services, cybersecurity and telecom interconnections at France-based IT services company Cyllene.
With more than 400 employees spread across 13 locations in France, Cyllene supports more than 1,500 public and private clients in managing critical data and designing IT and cybersecurity architectures.
In response to increasing cyber risks, Cyllene unveiled its latest device at the Energaïa trade show in December 2025: the Cyllene Box, also known as the RC-DC4/5G.
“The aim was to replace a model based on ADSL and satellite with a system that is both more efficient and more secure,” Le Fauconnier said. pv magazine France.
The device adapts to the available connections in each area and supports fiber optic, fourth and fifth generation mobile networks (4G/5G) and, where necessary, satellite connections.
“With multiple Ethernet ports and integrated Wi-Fi, the Cyllene Box sits upstream of the network infrastructure to ensure a secure internet connection,” he explains. “It integrates a firewall and provides encryption and authorization for all data, protecting all connected Internet of Things (IoT) and supervisory control and data acquisition (SCADA) equipment.”
Cyllene also operates a software-defined wide area network (SD-WAN) platform, hosted and managed across its three French data centers, in response to renewable energy customer demand for domestic data hosting.
The company currently manages 150 PV parks throughout France, half of which are already equipped with the Cyllene Box. “By the end of February, all parks will have been migrated,” says Pierre-Vincent Caisso, director of the ClientPartner and Consulting department.
The Cyllene Box is linked to a management portal that centralizes all park data.
“It enables dynamic network mapping of connected equipment, helping operators comply with the European NIS 2 directive, which aims to strengthen resilience against cyber threats,” Caisso added.
The guideline requires documentation such as flow matrices, network diagrams, and replicated information across multiple backups, all of which are supported by the Cyllene Box and its management platform.
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