Arholma Island Cable
Island LinkOperationalSE2023
Status:Operational
Project Company:Vattenfall Eldistribution
Type:island link
Website:www.vattenfalleldistribution.se
Arholma Island Cable refers to the submarine electricity supply that links Arholma, an island in the northern Stockholm Archipelago, to the Swedish mainland distribution network. The link functions as the primary distribution-level supply route for the island’s permanent and seasonal population and is complemented by local generation and storage assets...
Supply Chain (0)
Project Timeline (4)
2025Operations OtherStale
During 2025 Vattenfall Eldistribution plans to run a follow‑on operational project on Arholma Island to integrate customer demand and rooftop solar into the microgrid control system by installing remotely controlled breakers in homes and small enterprises, allowing selective disconnection and sequential reconnection of loads such as electric heaters, heat pumps and floor heating to manage peak demand and secure grid stability after mainland cable outages.
Aug 2023Commercial Operations Full Power
Vattenfall Eldistribution placed the Arholma Island electricity system into full operation in its microgrid-enhanced configuration when the Arholma microgrid was inaugurated in August 2023. The system, connected at the 11 kV point of common coupling to the mainland submarine cable, incorporates two 160 kW / 336 kWh lithium‑ion battery energy storage units, a small 2.73 kWp solar PV installation, and a central energy management system, enabling the island to operate autonomously for short periods during mainland outages and thus marking commercial operation of the upgraded Arholma Island Cable link and microgrid.
2019Early Development Other
Vattenfall designed the Arholma Island microgrid system in 2019, sizing its solar PV and two 160 kW battery units to support the island during outages of the mainland cable, although subsequent growth in electricity demand has since exceeded the original design assumptions.
2017Early Development Other
In spring 2017, Vattenfall initiated the Arholma microgrid project on Arholma Island in the northern Stockholm archipelago, as a collaboration between Vattenfall Eldistribution, Vattenfall Elanläggningar and Vattenfall R&D to investigate how smart control of distributed energy resources and microgrid operation can support future sustainable energy systems on the island’s grid connection to the mainland.