Transelectrica

• ST Bucharest which includes Buzău, Călăraşi, Dâmboviţa, Giurgiu, Ialomiţa, Ilfov, Prahova, and Teleorman counties and the city of Bucharest. It operates 1,240 km of power lines.
• ST Constanţa which includes Constanţa, Tulcea, Galaţi, Brăila counties and partially that of Ialomiţa and Vrancea counties. It operates 900 km of power lines.
• ST Piteşti which includes Argeş, Olt and Vâlcea counties. It operates 1,200 km of power lines.
• ST Craiova which includes Dolj, Gorj and Mehedinţi counties. It operates 1,528 km of power lines.
• ST Timișoara which includes Timiș, Arad, Caraş-Severin and Hunedoara counties. It operates 1,100 km of power lines.
• ST Sibiu which includes Alba, Sibiu, Mureş, Harghita, Covasna and Braşov counties. It includes 987 km of power lines.
• ST Bacău which includes Suceava, Iaşi, Neamţ, Vaslui, Bacău, Vrancea, Botoşani counties. It operates 1,051 km of power lines.
• ST Cluj which includes Cluj, Bihor, Maramureş, Satu Mare and Sălaj counties. It operates 952 km of power lines.

Transelectrica SA is the first state-owned company listed on the Bucharest Stock Exchange from the programme "A Powerful Market" that the Romanian Government has initiated in order to float some public companies on the capital market. Now the company has a capitalization of approximately 1.1 billion €.

• OPCOM - The Power Market Operator - OPCOM SA („Operatorul Pietei de Energie Electrica" SA) was set up based on the GD no. 627/2000 as a subsidiary whose sole shareholder is Transelectrica. The mission of this company consists of providing an organized framework for electricity commercial trades.
• SMART - The company for transmission grid maintenance services SMART SA was established through the reorganization of Transelectrica as an entirely owned branch according to the GD no. 710/2001. The area of expertise of SMART SA is performing revisions and repairs for primary and secondary equipment from the transmission network, including prophylactic measurements, remedying incidents at electrical installations, rendering services in the energy field, micro-production of electric equipment.
• FORMENERG - The area of expertise of FORMENERG SA subsidiary consists of training activities for personnel in the energy sector. FORMENERG SA was established on 1 April 2002 as a subsidiary 100% owned by Transelectrica.
• TELETRANS - SC TELETRANS SA is a subsidy (of TRANSELECTRICA SA) having as main activity field IT and communications services for the administration of electrical transport networks for electrical transport networks administration. TELETRANS is operational since January 2003.
• ICEMENERG - In September 2003 through the GD no. 1065/2003 concerning the reorganization of the National Company "Transelectrica" SA and the „ICEMENERG" SA company by merger through absorption, was approved the reorganization of ICEMENERG SA as a subsidiary 100% owned by Transelectrica. ICEMENERG SA renders services in the field of thermo-electric power stations, electric substations and networks.
• ICEMENERG SERVICE - In 2004, through the government decision on the reorganisation of the National Power Grid Company Transelectrica SA and ICEMENERG SERVICE SA, by merger through absorption, there was approved the reorganisation of ICEMENERG SERVICE SA as a subsidiary 100% owned by Transelectrica.

• List of Romanian companies
• BET-10