British Gas owner Centrica has signed a 10-year deal worth more than 20 billion pounds ($27.07 billion) with Norway's Equinor to secure gas supplies starting in 2025, both companies said on Thursday.

The agreement starting October and covering the next decade would meet around 10% of the country’s annual gas demand.

Equinor has signed a significant contract with Centrica to supply the UK with natural gas over the next decade, valued at approximately £20bn ($27.11bn). The deal secures the supply of 55 terawatt-hours (TWh) of natural gas per year,