Trial operations at the new Olkiluoto 3 nuclear power reactor resumed late on Monday evening.
This followed a turbine failure during trial operations earlier that day, which caused the reactor's electricity output to drop to zero.
Nuclear power firm Teollisuuden Voima TVO's Communications Manager Johanna Aho said that Olkiluoto 3 was in a safe state despite the malfunction.
Shortly after 11 p.m. the reactor's operator TVO announced on Twitter that the test run had been resumed.
TVO announced on Sunday that the third unit of the nuclear power plant would continue its trial operation, with OL3 running at 60 percent capacity. In between the tests, the reactor would have produced around 850 MW of electricity for the Finnish grid.
"We were in the process of increasing power and we were well into it, but then the plant unit disconnected from the grid," Aho told STT.
TVO's Senior Vice President of Safety and Security, Veli-Pekka Nurmi, pointed out on Twitter late Monday that the important thing is that the plant worked as planned yesterday during the incident.
As of 7 a.m. on Tuesday morning, the plant unit was producing electricity at a capacity of more than 800 megawatts.
OL3 is scheduled to start regular electricity production in December this year.
