Electricity is composed of wide interconnecting networks of electrical line, power plants and diverse equipments such as transformers, electrical power distribution systems, and substations. Transmission System Operators (TSO) are part of the network and play a key role. Indeed they are the operators in charge of transmitting electrical power from generation plants to the regional or local electricity distribution operators. Transmission system operators are working on electrical lines with very high voltage, above 100,000 Volts, and they use transformers to reduce the voltage, below 66,000 Volt, for electrical power distribution. If you work for a transmission system operator company, safety and reliability will be the core of your work since any failure in power generation may possibly result in a large number of personal and property damages.

More: continued here