What is the voltage range typically generated by subtransmission substations?

Subtransmission substations typically generate voltages in the range of 34.5kV to 69kV. This voltage range is utilized for the effective distribution of electricity over medium distances. Subtransmission lines carry power from transmission substations to distribution substations and are vital for delivering electricity to local utility providers who then step down the voltage to levels suitable for residential or commercial use.

The reason other options are not suitable for subtransmission substations is because the lower voltage ranges provided in those choices correspond to either distribution levels or even service voltages for buildings. For instance, voltages such as 13,200 volts to 25,000 volts fall under distribution voltage levels, while options like 120 volts to 240 volts are typical for household use, and 1,000 volts to 10,000 volts would not meet the requirements needed for subtransmission. Therefore, the specified range of 34.5kV to 69kV accurately reflects the function and necessity of subtransmission substations in the electrical grid.