A facility that connects two or more independent electrical power systems or substations is designed to provide increased system reliability and flexibility. This interconnection allows for the transfer of power between the connected systems, particularly during contingencies such as equipment outages or periods of high demand in one area. For example, if a transformer fails at one substation, the other connected system, via this linking facility, can supply power to the affected area, minimizing disruption to customers.
The advantages include enhanced grid stability, improved voltage regulation, and the ability to share resources efficiently. Historically, these facilities were implemented to improve the resilience of power grids, especially as interconnected networks became more prevalent. This redundancy is crucial for maintaining service continuity and preventing widespread blackouts. The economic benefits stem from the optimization of power flow, potentially reducing operating costs for utilities.