商用電源
During the Second World War, gun batteries were built on the island. A twin six pounder emplacement at Galtness Battery on the coast at Salt Ness protected the Wide Firth from German torpedo boats. A Castle Battery was operational from 1941–43, as was an anti-aircraft battery. Mains electricity arrived on Shapinsay in the 1970s, when an underwater cable was laid from Kirkwall.