The Geelong Refinery Is Back but Your Premium Petrol Problem Isn't

While every fuel headline this month has obsessed over the excise change, the most important story happened quietly on the shores of Corio Bay. In the last days of June, Viva Energy switched its biggest petrol making machine back on, and almost nobody noticed.

Here's what's really going on. Back in mid April, a fire broke out in the gasoline complex at the Geelong refinery, one of only two oil refineries Australia has left. Early investigation findings pointed to a piping failure in the alkylation unit. Nobody was hurt and the blaze was out by the next morning, but the damage rippled through the whole plant. Petrol output dropped to roughly 60 per cent of normal. Diesel and jet fuel held up better, at about 80 per cent.

Then came the quiet turnaround. In late June, Viva confirmed it had successfully restarted the Residue Catalytic Cracking Unit, the RCCU, and that production was climbing back above 90 per cent of normal capacity. The ACCC's weekly fuel monitoring update on 3 July backed that up, noting the refinery was operating at over 90 per cent, import orders were locked in for the weeks ahead, and there were no concerns about meeting current demand.

Genuinely good news for anyone filling up in Victoria. But there's a catch buried in the fine print, and it involves the one machine that isn't coming back any time soon.

Why one unit in Geelong reaches your local servo

To put this in perspective, the Geelong refinery supplies more than half of Victoria's fuel and roughly 10 per cent of Australia's total demand. It can process up to 120,000 barrels of crude a day and employs over 1,100 people. When something breaks there, motorists from Melbourne to Mildura feel it eventually, even if they never find out why.

The RCCU is the heart of the operation. It takes the heavy, low value leftovers from crude oil distillation and cracks them into petrol and other higher value products. That's why petrol production fell so much harder than diesel after the fire. Diesel comes off the distillation columns fairly directly. Petrol, at least in the volumes a modern city demands, needs the cracker running.

What most people don't realise is how thin Australia's refining base has become. Going back to the year 2000, this country had eight operating refineries. Today there are two: Geelong, and Ampol's Lytton plant in Brisbane. Everything else arrives on ships, mostly from refineries in Singapore, South Korea, Japan and Malaysia. So when half of your domestic refining capacity is knocked about by a fire, there's no spare plant down the road to pick up the slack. There are only imports, strategic reserves, and a fair bit of hoping the shipping schedule holds.

That's exactly what happened through autumn. Government fuel supply updates in May showed around four billion litres of imports scheduled to arrive over a single month, strategic reserves released hundreds of millions of litres of diesel and jet fuel, and minimum stockholding obligations were temporarily eased to push more fuel into the market. Ampol even deferred planned maintenance at Lytton from June to August to keep petrol flowing while Geelong was down. You never saw a dry bowser. That wasn't luck. It was a lot of scrambling behind the scenes.

The machine that makes premium petrol is still broken

Now for the part that didn't make the press releases sing. The alkylation unit, where the fire actually started, remains offline. Viva says it's assessing whether to repair or replace it, insurance discussions covering property damage and business interruption are underway, and the refinery is expected to operate at slightly reduced capacity into 2027.

If you've never heard of alkylation, you're in good company. The unit takes LPG byproducts from the refining process and converts them into alkylate, a clean, high octane blending stock. Alkylate is prized because it delivers octane in the mid 90s with barely any sulfur or aromatics in it. In plain terms, it's one of the key ingredients that turns ordinary petrol into 95 and 98 octane premium.

With that unit out of action for at least another year, Geelong can still make plenty of regular petrol, but its ability to blend premium grades from its own production is constrained. The gap gets filled the same way everything else does now: imported cargoes of finished premium fuel or blending components, bought on the Asian spot market and shipped across.

Industry contacts tell me this is a manageable problem rather than a crisis. Premium grades are a minority of total petrol sales, import supply chains for 95 and 98 are well established, and the temporary relaxation of fuel sulfur standards running through to the end of the year gives importers extra flexibility in sourcing cargoes. Manageable, though, is not the same as free. Imported premium carries freight, insurance and currency costs that locally refined product doesn't.

What it actually means at the bowser

The practical upshot for your wallet comes in three parts.

First, supply. Nobody credible is forecasting shortages. The RCCU restart, the import program and lower than normal demand over winter mean the east coast is comfortably covered. If you were quietly worried after the autumn headlines, you can stop.

Second, the premium spread. The gap between unleaded petrol prices and premium 95 prices or 98 has historically run somewhere between 12 and 25 cents a litre depending on your state and the point in the price cycle. With Geelong's alkylation unit down into 2027, that spread is the number worth watching. It won't spike overnight, but a market leaning harder on imported premium has one more reason to let the gap drift wider. If your car's manual says minimum 91 or E10, you're paying that spread for nothing anyway. Check the fuel flap before you pay for octane your engine never asked for.

Third, August. Ampol's deferred maintenance at Lytton lands in August, which means both of Australia's refineries will be running below full tilt at the same time, right as the remaining excise relief expires on 2 August. None of that guarantees higher prices, since imports fill gaps and the global oil price matters far more, but it does stack several pressures into the same few weeks. Keeping an eye on price trends through late winter will tell you quickly whether the market is absorbing it or passing it on.

The bigger picture

Here's the fascinating backstory in one line: a single length of failed piping in one unit of one refinery triggered strategic reserve releases, emergency import programs, relaxed national fuel standards and a deferred maintenance schedule in another state. That's how little slack is left in Australia's fuel system. Compared to other countries, we're an outlier. Most developed economies hold more refining capacity per litre consumed, and the ones that don't tend to hold deeper reserves.

The recovery at Geelong is a genuine win, and the people who got that plant back above 90 per cent inside ten weeks deserve more credit than they'll ever get. But the fire was a live test of the system, and the honest report card reads: passed, with visible strain.

A few things worth remembering:

The fuel industry rarely makes headlines until prices spike, but understanding what's happening in Geelong now puts you ahead of the curve. Keep an eye on this space.