The oil market has rarely moved this fast in either direction.
Crude oil fell to US$79 per barrel on Tuesday. This comes as officials from the US and Iran said they have reached a deal to reopen the Strait of Hormuz, potentially in time for the upcoming G7 meeting.
That is a fall of approximately 37% from Brent's intraday peak of above US$126 earlier in the conflict.
For Woodside Energy Group Ltd (ASX: WDS), Santos Ltd (ASX: STO), and Beach Energy Ltd (ASX: BPT), that move has immediate and significant implications.
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What the oil price retreat means for ASX energy shares
The link between oil prices and ASX energy shares is quite clear and direct.
When oil fell 20% in May on the first ceasefire talks, energy shares led the ASX 200 sectors down.
Woodside, Santos, and Beach all gave back significant portions of their earlier gains.
The EIA's June 2026 Short-Term Energy Outlook forecasts Brent prices averaging $105 per barrel in June and July, based on the assumption that the Strait of Hormuz remains closed.
Should the Strait reopen, that forecast would be revised sharply downward.
However, traders remain cautious. Prices briefly recovered after President Trump cast doubt on the reported draft agreement, saying the published terms did not reflect the agreement discussed.
Woodside Energy
Woodside has been the biggest beneficiary of elevated oil prices in 2026, rising 25% year to date.
A sustained fall to US$80 per barrel would reverse a significant portion of that gain.
However, Woodside's longer-term investment case is not solely dependent on the oil price.
The company's breakthrough Scarborough LNG project is now 94% complete with first cargo targeted for Q4 2026. Furthermore, Woodside's decade-long LNG contracts provide a significant floor for cash generation even in a softer oil price environment.
Santos Ltd
Santos is up approximately 20% year to date, making it one of the best-performing energy stocks on the ASX in 2026.
A deal to reopen the Strait of Hormuz would partially reverse those gains, with an 8% decline on Monday.
However, like Woodside, the investment case for Santos is also not just about the oil price.
The company's Barossa LNG project is already producing at 75% of its planned 2026 production rates, with plateau production targeted before year end. First oil from Pikka Phase 1 in Alaska provides an additional production stream.
These operational milestones should provide the company with greater protection and diversification against external oil price movements.
Beach Energy
Beach Energy is the most leveraged of the three to oil price movements, given its smaller size and higher sensitivity to oil and gas price changes.
Shares have fallen in recent weeks even as the broader energy sector surged, reflecting ongoing concerns about its production guidance downgrade in Q3 FY2026.
A sustained fall in oil prices to US$80 per barrel would add further near-term pressure to Beach's earnings outlook.
However, Beach has strengthened its balance sheet significantly, with available liquidity rising to $974 million and net gearing falling to just 11%.
This financial resilience means it can navigate the oil price volatility without the balance sheet stress that may concern investors in a more leveraged company.
Foolish takeaway
Oil at US$80 per barrel is materially lower than the levels that drove ASX energy shares to their recent highs.
If a sustained peace deal materialises and the Strait reopens, Woodside, Santos, and Beach may face further near-term price pressure.
But all three are operating businesses with diversified cash flows and long-term contracts that do not disappear when the oil price falls.
For long-term investors, the near-term volatility may be creating a more attractive entry point than was available a fortnight ago.
