Natural gas prices have jumped after strike action kicked off at two major liquefied natural gas (LNG) facilities in Australia.
The walkouts, in a row over pay and conditions, are taking place at Chevron's Gorgon and Wheatstone plants in Western Australia.
The US energy giant's two plants account for more than 5% of global LNG capacity.
On Friday, wholesale gas prices in the UK rose by about 10%, and markets will be watching how they perform today.
"Prices are up… but in a rather moderate way," said analysts at Engie EnergyScan told the BBC.
"We have not yet reached the stage of a drop in supply. So, no need to panic in a context where all other fundamentals are rather bearish," they added.
Australia is one of the world's largest exporters of LNG, along with Qatar and the US, and its supplies have helped to cool global energy prices after Russia began cutting its supplies of natural gas to Europe.
While wholesale energy costs have fallen since Russia's invasion of Ukraine last year, pressure on prices remains.
Oil prices rose last week, with Brent crude trading at about $90 a barrel, after Saudi Arabia and Russia extended their cuts to supplies to the end of the year.
FTSE 100
The UK's top share index, the FTSE 100, was up 41-points at 7,519 shortly after opening this morning, following Friday's 36-point rise.
Brent crude futures were down 0.30% at $90.38 a barrel.
Companies reporting today
- Vistry (Half year results)