Viva Energy Group Ltd (ASX: VEA) shares are off the board on Thursday after one of the ASX's best-performing energy stocks was forced into a trading halt.
The stock last traded at $2.53, having fallen 4.53% on Wednesday before trading was paused ahead of market open.
Even with that decline, the Viva Energy share price remains up 23% in 2026. Roughly 18% of that gain has come over the past month alone as investors rotated back into energy and fuel-exposed names.
That recent momentum makes today's freeze stand out as investors wait for more detail on the operational impact.
Here's what has happened.
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Trading halt follows major Geelong refinery incident
In a statement to the ASX, Viva Energy requested an immediate trading halt pending an announcement on the impact of a significant fire at its Geelong refinery.
The halt will remain in place until the earlier of Monday's market open or when the company releases a fuller update.
The overnight blaze broke out in the motor gasoline production unit at the Geelong site, which is one of only two remaining oil refineries in Australia.
News coverage indicates the incident was linked to equipment failure in the petrol production area, with multiple reports of explosions before the fire was contained.
Management said most other refinery units are still operating at minimum rates to maintain site safety, while the affected fuel production systems remain offline pending further assessment.
Why investors will be focused on earnings risk
The Geelong refinery supplies more than 50% of Victoria's fuel needs and around 10% of Australia's total fuel supply. That tells us the incident has both financial and broader market significance.
Early analyst estimates suggest even a short disruption could strip roughly $20 million from earnings. A prolonged outage stretching into months could push the hit closer to $70 million.
The market will also be watching whether petrol production downtime forces higher-cost imports. That could compress refining margins at a time when global fuel supply is already under pressure from Middle East disruptions.
Lost production, higher import costs, and uncertainty around repairs likely explain why the shares were frozen before investors could quickly reprice the stock.
The bigger issue goes beyond the share price
Fuel security now becomes the major sticking point.
Only two domestic refineries are still operating nationally. That means any extended outage at Geelong immediately raises concerns around supply reliability, pricing pressure, and whether the government needs to lean harder on imports.
Viva Energy has already said unaffected units can continue limited operations and management appears confident imported product can help bridge any shortfall.
The next announcement will likely decide whether this remains a short-term sentiment shock or develops into a larger earnings hit.
