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Utö (Haninge municipality, Stockholm southern archipelago) has been connected to the Swedish mainland power grid via a Vattenfall Eldistribution submarine cable for several decades. The exact original commissioning date is not available in publicly accessible sources (confirmed by 2026-04-15 research that consulted Vattenfall Eldistribution, Sjöfartsverket Notices to Mariners, and Haninge municipality records). A 2020 boat-life study of the Stockholm archipelago notes that year-round electrification of inhabited archipelago islands generally occurred in the 1970s-80s as Sweden's national grid programme extended to remote islands. 1975 is used here as an approximate placeholder reflecting "operational since at least the mid-1970s" pending authoritative confirmation from a direct request to Vattenfall Eldistribution or Lantmäteriet's ledningsrätt register. Event date precision is explicitly marked 'approximate'; actual date should be backfilled when an authoritative source is located. Same placeholder pattern applied to other small Nordic DSO island-link cables (e.g. Île de Bréhat 1970, Agerso-Omo 2012 replacement).