Algeria says the long-stalled restart of the third train at the In Amenas gas plant is imminent, with a further boost planned as new wells are brought on next year. But for the country’s oil output the only way appears to be down.

Algeria’s In Amenas gas plant, which was hit by a terrorist attack in January 2013, is set to finally see the third of its 3 bcm/year trains restart “in the coming days,” the project’s director general Kamel Aoues says. An initial...