Swimmers, fishers and boaters in Queensland have been warned to stay away from the waters for at least until the weekend is over.
Late on Thursday it was about 820km northeast of Brisbane, packing wind gusts of up to 130km/h.
He said the outages were all under investigation, but it would depend on the extent of the damage as to how fast power was turned back on.
And although Cyclone Oma is not expected to make landfall, the category-two storm is already whipping up the water, closing all Gold Coast beaches and most on the Sunshine Coast in the process.
The weather system was already bringing hazardous surf conditions and abnormally high tides.
The Bureau of Meteorology has issued a "watch" zone from Bundaberg in Queensland to Ballina in NSW, including Brisbane, the Sunshine Coast and the Gold Coast.
Bureau of Meteorology senior forecaster Jonty Hall says Oma will maintain its slow 10km/h path towards the coast until Friday.
Some beaches will be closed as unsafe winds, surf and abnormally high tides continue into the weekend from about Fraser Island down to the NSW border.
After that, its behaviour is less predictable.
The areas now most at risk of unsafe surf conditions are Fraser Island and Wide Bay coast north of Bargara.
On the Gold Coast, council crews have begun removing sand dune fencing from vulnerable beaches expected to cop the worst of massive swells expected to roll in.
"We are starting to see the main swell packet from Oma starting to arrive on the south coast of Queensland now", Mr Hall told ABC radio.
While the cyclone was not expected to hit the coast, severe weather and hazardous conditions are still forecast along the coast.
"This has the potential to be a significant beach erosion event, given the combination of the increasing surf, abnormally high tides and the fact that these conditions should persist for a few days".
"These conditions are then expected to extend south over the remaining southeastern Queensland coast during this evening and Friday". The Bureau has issued a flood watch from Gladstone to the New South Wales border.
While it is unusual for a cyclone to track this far south, it is not unprecedented.
In 1990, Cyclone Nancy directly impacted Brisbane, but didn't make landfall.