Mikael Lilius, the chief executive of Finnish utility Fortum, was quoted as saying by Energia, an industry publication, on Monday that the Finland should grant a permit to build a nuclear power station to all three hopefuls.
"I cannot understand why one should start regulating who can build and who cannot when we have three willing builders," Mr Lilius told Energia, referring to Fennovoima, Fortum and Teollisuuden Voima.
"It has long been said that the industry is underinvesting. Would it not be good if it invested more?"
Fortum, 51-per cent owned by the Finnish state, is expected to apply for planning permission to build what would be its third nuclear power station.