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.

Equinor ASA EQNR, the Norwegian energy giant, and Centrica plc, owner of British Gas, have inked a £20 billion gas supply agreement for 10 years starting Oct. 1, 2025. Under the terms of the deal, Equinor will supply 55 terawatt-hours (TWh) of natural gas annually,

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,