What aspect must the facilities alternator output match with that of the utilities system?

The output of a facilities alternator must match the frequencies of the utilities system to ensure proper synchronization and operation. When two sources of electrical power are connected together, they must operate at the same frequency to avoid damaging equipment or causing instability in the electrical grid.

If the frequency of the alternator does not match that of the utility, it can lead to phase differences, which create power quality issues and possible equipment malfunction. Operating at the correct and consistent frequency is essential for the safe and efficient distribution of electricity, making it crucial in a power engineering context.

While other aspects like load capacity, temperature, and phase alignment are important in their own ways, the frequency matching is a fundamental requirement for integrating power sources into the electrical grid. Ensuring that the alternator's frequency aligns with that of the utility system allows for reliable power supply and maintains system stability.