Located in Mäntsälä in southern Finland, it is Rexam's first plant in the country and represents an investment of about £68m over three years as part of the company's current capital investment plans.
The new plant will employ around 100 local people.
On completion of the second line, scheduled for 2014, the new plant will have a capacity of approximately 1.35 billion 330ml and 500ml aluminium cans.
According to Rexam, the Nordic market has shown good growth in recent years and Finland itself has experienced a "steady transition" from glass bottles to can fillings.
At the inauguration of the new line, Rexam chief executive Graham Chipchase said: "We have seen a growing demand for beverage cans in Finland and the Baltic States, in particular the can's share of the pack mix for beer in Finland, which has grown from 10% to 60% over the past five years.
"The investment supports our strategy for growth in a steadily expanding European market."
