ANRE identified non-compliance with mandatory regulations for distributors with a direct impact on the activity of prosumers, it said in a press release.
Each of the six companies - Distributie Energie Electrica Romania, Distributie Energie Oltenia, Delgaz Grid, E-Distributie Muntenia, E-Distributie Banat and E-Distributie Dobrogea - were fined 400,000 lei.
Distributie Energie Electrica Romania is a subsidiary of Electrica, the leading distributor and supplier of electricity in Romania.
Distributie Energie Oltenia was established in 2007 and is owned by Czech energy company CEZ.
Delgaz Grid is owned by E.ON Romania and operates a natural gas network of over 24,000 km and an 83,00 km electricity grid in northern and western Romania.
E-Distributie Muntenia, E-Distributie Banat and E-Distributie Dobrogea are all owned by Enel Group Romania.
($=0.9494 euro)