HELSINKI, April 15 (Reuters) - Finland's much-delayed Olkiluoto 3 (OL3) nuclear reactor, Europe's largest, will begin regular output on Sunday, its operator said on Saturday, boosting energy security in a region to which Russia has cut gas and power supplies.
Construction of the 1.6 gigawatt (GW) reactor, Finland's first new nuclear plant in more than four decades and Europe's first in 16 years, began in 2005.
The plant was originally due to open four years later, but was plagued by technical issues.
As a result of the startup, analysts have said Finland, the only Nordic country with a large power deficit, can expect lower electricity costs.
Reporting by Essi Lehto; Editing by Terje Solsvik and Jan HarveyOur Standards: The Thomson Reuters Trust Principles.