Spring in Australia means two things starting to build at once. Bushfire risk gets most of the attention, but severe thunderstorm season runs right alongside it, from October through to the end of the year, and it's actually the bigger cause of power outages nationally.
It's easy to underrate this one because a storm passes in an hour, not a season. But an hour is plenty of time to bring a line down.
What a severe thunderstorm actually brings
The Bureau of Meteorology warns for three specific things when a storm crosses the severe threshold:
- Large hail, which BOM defines as anything over 2cm, though the strongest storms can produce hail the size of a cricket ball or bigger
- Damaging wind gusts, strong enough to bring down trees and power lines
- Flash flooding, from heavy rain falling faster than the ground or drains can handle
Any one of these can knock out power. Wind is usually the one that does it, either from a falling tree or direct damage to the network itself.
This isn't hypothetical. In late October a few years back, a storm system tore through South Australia and Victoria, dropping so much hail on Adelaide's northern suburbs that car parks looked like they'd been snowed on, and cutting power to more than 500,000 people. More recently, on 26 March this year, a severe storm hit New South Wales hard enough that the SES responded to 591 incidents in 24 hours, wind gusts reached 115km/h in Dubbo, and a crane came down in the Sydney CBD.
Why this is a different kind of power risk to bushfire
Bushfire risk builds over weeks. You can watch the outlook, check the soil moisture reports, and plan ahead of time. A severe thunderstorm doesn't give you that runway. The warning might come a few hours before it hits, sometimes less.
That changes what actually matters here. It's less about long-range planning and more about whether your setup is ready to go the moment the power drops, without you needing to think it through under pressure. A generator that needs troubleshooting or a fuel top-up before it'll start is a problem you don't want to be solving in the dark with a storm still going outside.
What's worth checking now, before the season gets going
A few things are worth a look before storm season properly kicks in, not after the first outage of the year catches you out:
- If you've got a standby generator, when did it last actually run under load, not just tick over for a minute
- Is there enough fuel on hand right now, given a storm can knock power out for a day or more if a line needs repairing
- Does anyone in the house actually know how to start it, or is that knowledge sitting with one person who might not be home when it matters
None of this takes long to check. It just needs doing before the storm, not during it.
The upside of getting this right
A well-timed storm prep conversation isn't really about the storm itself. It's about not finding out your setup has a gap in the middle of a blackout, when the shops are shut, tradies are flat out, and everyone else on the street has just realised the same thing you have.
