Pellworm connected to mainland grid via two 20 kV submarine cables. Exact commissioning date unknown; cables have been operational for decades supplying 1,200 island residents.
In 1942, the first 20,000‑volt subsea cables from Dagebüll and Nordstrand to the North Sea islands, including Pellworm, were laid, completing the initial electrical cable connection that supplied Pellworm with power from the mainland network.