🛠️ Invention or technique

Gotland HVDC link

Línea HVDC de Gotland

Date
1954 · confidence high
Place
Västervik, Småland, Sweden
Credited to
ASEA (Uno Lamm)
Field
Matter & energy

What it is

A 98 km submarine cable at 100 kV direct current between Gotland island and the Swedish mainland, with mercury-arc valves as converters. It was the first commercial high-voltage direct-current transmission link.

What it led to

  • undersea interconnections between countries (Channel, Baltic, North Sea)
  • thyristor converters (Eel River, 1972) and IGBTs
  • long-distance transmission of hydro and wind power
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Sources✓ verified 2026-11-04