Iran Could Add Million More Barrels a Day to the Oil Glut

Iran says it could add a million barrels to daily oil production shortly after a deal to lift sanctions, reclaiming the position of OPEC’s second-largest supplier. While such a boost would take months because sanctions may be rolled back slowly, industry observers agree the capacity is there.

Going further than that and adding a second million barrels -- as the government has said it plans to do -- will prove a much bigger challenge. It would take some five years and tens of billions of dollars of investment, according to two former oil-industry executives who worked in the country.