Neutral
Informational - no clear directional impact
Low Impact
Minor progress or informational
Around 2013, the original Fenno‑Skan 1 link underwent a major upgrade in which its control system was modernised to a fully digital MACH system and the converter stations were configured so that Fenno‑Skan 1, originally a monopolar link using sea return, could operate as part of a bipole with Fenno‑Skan 2, improving performance and reducing reliance on sea electrodes.