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In 1968, the 110 kV submarine cable link Dugi Rat–Postire (KB 110 kV Dugi Rat–Postire) entered service as the first 110 kV mainland–Brač connection (“kopno–Brač I”), with a length of 8,662 m. This cable, built as part of the 110 kV island transmission loop developed between 1968 and 1978, integrated Brač into the high‑voltage Adriatic island network between TS 110/35 kV Dugi Rat and downstream island substations.