A power outage is still affecting the intensive care unit at a major Adelaide hospital after a significant electrical outage.

On Tuesday afternoon, SA Health confirmed the Flinders Medical Centre in Adelaide’s south had “experienced significant electrical fault, resulting in a power interruption.”

It was later revealed that the issue was caused by a transformer failure.

The power has been restored to “most” of the hospital according to Southern Adelaide Local Health Network, however one area of the hospital, including the ICU, is still running on generator power.

Technicians worked throughout the afternoon to restore electricity to the building.

Flinders Medical Centre is currently closed for visitors except for those in exceptional circumstances.

“Business continuity plans remain in place while repair works are underway,” a Southern Adelaide Local Health Network said.

“Out of an abundance of caution a decision was made following clinical advice to relocate some patients to Flinders Private Hospital’s ICU.”

Earlier in the day, SA Power Networks head of corporate affairs Paul Roberts said the incident was due to a fault within the hospital itself, and wouldn’t affect homes in surrounding suburbs.

“There is a separate, dedicated line of power supply to the hospital, and there was an internal fault that triggered the outage,” Mr Roberts said.

“The main line of supply has tipped, meaning Flinders Medical Centre is unable to accept power from that line at this time.”