The company's net income for the first three months of 2015 was 37.2 million dinars ($98.7 million), up from 17.1 million dinars in the same period a year ago, the firm said in a bourse filing.
SICO Bahrain forecast Alba would make a quarterly profit of 25 million dinars.
The firm said first quarter sales rose 13 percent year-on-year to 206.6 million dinars.
Alba is close to selecting the financial adviser for its $2.5 billion Line 6 expansion project, having whittled down its choice to two banks, its chief financial officer told Reuters on April 9.
The scheme will make Alba the largest single-site aluminium smelter in the world by boosting per-annum production to around 1.3 million metric tonnes.
($1 = 0.3770 Bahraini dinars) (Reporting by David French; Editing by Matt Smith)