Woodfibre LNG had earlier signed 15-year off-take agreements with BP Plc, representing 70% of capacity.
Under the latest agreement, BP Gas Marketing Ltd will receive an additional 0.45 million tonnes per annum (mtpa) of LNG from Woodfibre over 15 years, increasing BP's total LNG off-take to 1.95 MTPA.
Calgary-based Enbridge (ENB.TO) bought a 30% stake in Woodfibre last year, with the remaining 70% owned by privately held Pacific Energy Corporation.
Woodfibre project construction is scheduled to start in September, with operations expected to begin in 2027.