It said its operating revenue increased 29%, to RON1.73 billion from RON1.35 billion in the first half of 2016, and its EBITDA dropped 17%.
Transelectrica said its earnings were influenced by a 10% drop in transport tariffs.
Domestic energy consumption grew 3.04% in the first half of the year, while net energy output increased 4.54%, the company said. Electricity exports grew 9.3%, while imports declined 12%.
Thermal power held the biggest share in domestic electricity output, of 41%, followed by hydropower (26%), while renewable and nuclear power accounted for around 17% each.