Royal Dutch Shell Plc, Europe's largest oil company, said its Nigerian venture is taking advantage of a declared cease-fire to quickly restore 800,000 barrels a day of production lost to earlier militant attacks.

The Soku gas plant, shut down after sabotage, was restarted on Oct. 15, Ann Pickard, African executive vice president for Shell, told journalists in Cape Town today. The company is trying to ramp up production following an “indefinite cease- fire” declared by the Movement for the Emancipation of the Niger Delta, the main rebel group known as MEND, on Oct. 25.