Cheniere said it will sell 2 million tonnes of LNG per year on a delivered basis to the state-owned oil and gas company, starting in 2021. It said the purchase price will be pegged to the Henry Hub monthly average, plus a fee.
A CPC spokesman said the $25 billion figure was based on current prices. CPC's company statement on Saturday did not provide a monetary figure for the deal.
"Most importantly, it helps to further achieve the diversification of LNG sources and stability of energy supply into the Taiwan market that are among CPC's key objectives," CPC Chairman Tai Chein said in a statement on Saturday.
Chein said that LNG buyers see Qatar, Australia and the United States as leading suppliers in the future.
CPC has already been importing substantial volumes from Qatar and Australia.
The deal is also viewed as an important part of Taiwan's efforts to reduce its trade surplus with the United States, according to a source familiar with the government's thinking.
The contract is a significant boost to Taiwan's trade relations with the United States, particularly given the Trump administration's focus on trade with Asia, the source said.