HVAC overhead lines typically transport electricity in the transmission network. Only in Europe, there are over 474 thousand kilometres of HVAC lines [10]. Underground cables also carry electricity at high voltages. Nevertheless, the initial cost of the underground transmission system is higher compared to the overhead lines since it requires digging and trenching. HVAC lines also interconnect different areas or countries, increasing the security of supply and improving the reliability of the electricity system. Europe counts with more than 390 cross-frontier lines [10].
All information in the datasheets is also available in ESDL (Energy System Description Language). You can find them in the Energy Data Repository (EDR).