Romanian transmission system operator Transelectrica plans to invest more than €2.25 billion between 2026 and 2035 as part of a ten-year grid programme. The plan prioritises international interconnectors, completion of the domestic 400-kV transmission ring, and renewable integration. The programme covers 117 projects, including 25 new developments.
International interconnection and cross-border capacity
Around €440 million, or almost 19% of total investment, is earmarked for international interconnection capacity. The scope includes projects involving Hungary, Serbia and Moldova. This element is designed to support larger electricity exchanges with neighbouring markets while maintaining system flexibility.
The investment programme also aligns with the changing structure of Romania’s electricity sector. As wind and solar generation expand rapidly, electricity flows increase in volume and variability. Transelectrica notes that insufficient transmission capacity could become a constraint on project connections.
Completion of the 400-kV transmission ring
A second major priority is completing Romania’s 400-kV transmission ring. The ring is intended to improve electricity transfers between regions and strengthen reliability across the high-voltage network. Upgrades are also planned beyond the ring works.
Transelectrica will carry out upgrades to existing lines and substations, add new transformers, and install new monitoring equipment. These measures are aimed at improving system control. The programme’s focus on grid build-out is linked to the need to move renewable generation output from generation centres to areas with concentrated demand.
Financing and system integration priorities
Transelectrica expects to finance the investment through several sources, including EU support . The operator’s planning places renewable integration alongside network expansion priorities for the 2026-2035 period. Stronger international links are expected to enable increased cross-border electricity trade volumes.
The scale of the programme reflects a broader shift in regional electricity investment priorities toward transmission infrastructure alongside new generation. Romania’s ability to integrate its renewables pipeline and increase its role in cross-border electricity trade will depend on whether grid construction keeps pace with generation development .
