IEEE 1109-1990

1109-1990 is a technical standard focused on owned substations and their relationship to electric utilities. It is relevant to power, energy, and industrial applications where substation ownership, interface responsibilities, and operating expectations need to be clearly understood. As a dated standard, it may be used for legacy reference, procurement review, or historical compliance work. For organizations dealing with utility-connected facilities, it helps define a common basis for planning and coordination.

What is 1109-1990?

IEEE 1109-1990 is a standards document associated with substations owned by customers or other non-utility parties and connected to electric utilities. Its technical context is centered on how those substations are identified, managed, and aligned with utility interface requirements. In practice, the standard supports consistent treatment of electrical service arrangements, responsibilities, and coordination points. For engineers and asset managers, 1109-1990 provides a structured reference for understanding the utility-substation boundary.

Where is 1109-1990 used?

1109-1990 is typically used in power systems environments where a privately owned substation supplies a facility but depends on an electric utility for incoming service. This can include industrial plants, large commercial sites, campuses, and other installations with dedicated high-voltage or medium-voltage distribution equipment. It is most useful during substation planning, utility interconnection discussions, operating review, and document control. The standard may also support internal engineering files and utility coordination records for 1109-1990-related assets.

Why is 1109-1990 important?

This standard matters because substation ownership and utility interface details can affect reliability, safety, and accountability. Clear guidance helps reduce misunderstandings between facility operators and electric utilities, especially around access, operating boundaries, and maintenance responsibilities. It can also support more consistent design decisions and procurement specifications for substation equipment and related services. For organizations managing utility-connected electrical infrastructure, 1109-1990 provides a useful reference for risk reduction and coordination.

• Owned substation interface
• Utility coordination points
• Power and energy applications
• Legacy reference use
• Electrical service responsibility