Overview
Hearn Substation is an operational electrical substation owned by Arizona Public Service in Arizona, United States. It operates at 69 kV, serving as a key node in the regional transmission grid.
Hearn Substation is an operational electrical substation located in Arizona, United States, owned and operated by Arizona Public Service. The facility operates at a voltage level of 69 kV, classifying it as a medium-voltage substation within the regional transmission network. It plays a role in stepping down power for distribution or interconnecting local generation. As part of the U.S. electrical infrastructure, Hearn Substation operates under the regulatory framework established by the Federal Energy Regulatory Commission (FERC) and adheres to North American Electric Reliability Corporation (NERC) reliability standards. These standards ensure grid stability and cybersecurity for critical assets. The 69 kV voltage level is typical for sub-transmission systems that serve industrial or urban areas. The substation's location in Arizona places it within a region experiencing growing electricity demand due to population growth and economic development. Its operational status contributes to the reliability of the local grid, supporting residential, commercial, and industrial customers. The facility is part of Arizona Public Service's network, which serves over 1 million customers across the state.
Environmental context
The substation is situated in a semi-arid climate typical of the southwestern United States, where high temperatures and low humidity can affect equipment performance and cooling requirements. The surrounding area is characterized by desert vegetation and urban development. Electrical infrastructure in this region must be designed to withstand extreme heat and occasional dust storms, which can impact insulation and maintenance schedules.
Frequently asked questions
Hearn Substation is located in Arizona, United States, at coordinates 33.613840, -112.412197. It is owned and operated by Arizona Public Service.
Hearn Substation operates at 69 kV, which is a medium-voltage level commonly used for sub-transmission and distribution in the U.S. electrical grid.
Hearn Substation is owned and operated by Arizona Public Service, a major utility company serving over 1 million customers in Arizona.
Substations in the U.S. must comply with NERC reliability standards and FERC regulations. These cover grid reliability, cybersecurity, and maintenance practices to ensure stable electricity delivery.
A 69 kV substation typically steps down transmission voltage for distribution to industrial or large commercial customers, or interconnects local generation. It is a critical node for grid stability and load balancing.