A major power outage disrupted Adelaide's central business district on Thursday morning, affecting more than 100 buildings across a section of the city centre.

The outage began shortly before 9am on October 1, affecting an area between Light Square and Gawler Place. Several major facilities were among the buildings affected, including Adelaide Town Hall and a TAFE SA campus.

The disruption created difficulties for businesses, workers, students and visitors in the CBD during the morning period. Power interruptions in a busy commercial area can affect lighting, lifts, electronic systems, payment facilities and other essential services.

By around 11am, power had been restored to many locations, although 19 buildings were still reported to be without electricity. SA Power Networks crews continued working to identify and resolve the remaining interruptions.

Power was subsequently restored across the affected area at approximately 12pm, according to SA Power Networks.

The outage affected a central section of Adelaide, with businesses and public facilities having to manage the temporary disruption. Adelaide Town Hall was among the prominent locations affected, while the TAFE SA campus also experienced the interruption.

Electricity outages in CBD areas can have wider effects because of the concentration of businesses, public services and transport-related infrastructure. Even relatively short interruptions can disrupt scheduled activities and require businesses to temporarily change their operations.

The incident occurred on the first day of October and was resolved within several hours. At the time of the latest reports, there was no indication that the entire Adelaide metropolitan area had been affected.

SA Power Networks was responsible for responding to the electricity interruption and restoring supply. Crews worked through the morning to progressively bring affected buildings back online.

The cause of the outage and the full extent of any infrastructure damage or equipment failure had not been detailed in the latest available report.

For people working or studying in Adelaide's CBD, the restoration means normal electricity services have resumed, although individual buildings may have experienced separate impacts while systems restarted.

The incident is another reminder of the importance of reliable electricity infrastructure in major city centres, where businesses, government facilities and educational institutions depend heavily on uninterrupted power.

The latest report said that by about midday, SA Power Networks had confirmed power was fully restored and the CBD was no longer experiencing the widespread outage.