The RON12.3 million fine was levied on Energy Holding in a case involving state-owned power producer Hidroelectrica and its contractual partners.
Energy Holding may appeal the decision at the High Court of Justice.
This is the second of seven lawsuits opened after Hidroelectrica and ten of its contractual partners were fined a total EUR37 million by antitrust authorities for price fixing.
Hidroelectrica was fined alongside ALPIQ Romindustries SRL, ALPIQ Romenergie SRL, ALRO SA, Electrocarbon SA, Electromagnetica SA, ELSID SA, Energy Financing Team AG, Energy Holding SRL, Luxten Lighting Company SA, and Menarom-P.E.C. SA.
Hidroelectrica, Elsid, and Electrocarbon admitted they resorted to antitrust practices.