By Ed Ballard

LONDON--Centrica PLC, one of the U.K.'s biggest energy suppliers, has extended two gas supply agreements with Norway's Statoil ASA and Russia's Gazprom OAO, underscoring the country's reliance on imported energy.

Centrica, which owns British Gas, said Wednesday it extended an agreement struck in 2011 with Statoil by 2.3 billion cubic meters of gas per year. Over the course of the 10-year deal, which comes into effect this year, 73 billion cubic meters, or bcm, will be delivered, instead of 50 bcm.

A three-year supply deal that came into effect last year with Gazprom Marketing & Trading Ltd., a U.K. subsidiary of the state-owned gas giant, has been expanded from 2.4 bcm to 4.16 bcm per year, and will now run until 2021.

"Britain needs around 70 bcm of natural gas each year to heat homes and businesses and to generate electricity, and the U.K. now needs to import more than half of this," Centrica said.

"The long-term supply agreements with Statoil and GM&T will meet the gas needs of 9 million British homes every year and take the total amount that Centrica has committed in securing gas and electricity, through a range of suppliers, to over 50 billion pounds [$78.3 billion]," the company added.

Write to Ed Ballard at ed.ballard@wsj.com

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