UPDATE 1.20pm: Woodside says it has signed a deal to sell 1.5 million tonnes of LNG to Japanese electricity provider Chubu Electric Power over three years starting in April.
Woodside said the LNG would be sourced from previously uncommitted volumes from the company's Pluto project off the North West coast.
Other terms of the agreement remain confidential.
Woodside chief executive Peter Coleman said the agreement added to the company's long-term relationships with major Japanese energy buyers.
"The agreement demonstrates the importance of Pluto LNG volumes in meeting growing regional demand for natural gas and also Woodside's increasingly diverse LNG purchasing, sales and shipping arrangements," he said.
Chubu Electric Power provides power on the Japanese island of Honshu and is the country's third biggest electricity utility in terms of power generation capacity, electric energy sold and annual revenue.
Woodside shares closed down 22 cents at $37.35.