Four stobie poles were blown over by strong winds in Whyalla two days after Christmas Day last year, it has been revealed.
Electricity agency SA Power Networks said on Thursday that the winds at the time had reached 85 kmh.
“This is very rare. When one pole goes over, you tend to have others go over, too,” said spokesman Paul Roberts.
He said at least one of the poles was rusted at the base as a result of the corrosive nature of the coastal soil.
The agency evaluated poles around the town and removed a couple that were potentially at risk of toppling.
The incident happened at the McDouall-Stuart Avenue end of McLennan Avenue with the poles landing on the street and blocking traffic.
Blackouts extended from the Norrie Avenue lights.
Emergency Services blocked off from Henderson Street/McLennan Ave, McDouall-Stuart Avenue/ Viscount Slim Avenue and McDouall-Stuart Avenue/McRitchie Crescent. Detour signs were set up.
Mr Roberts said the poles would have been repaired at the time.