What is EPS in power system?

Could you please elaborate on the term "EPS" as it pertains to power systems? I'm curious to understand its specific role and function within the broader context of electrical engineering and energy distribution. How does EPS contribute to the reliability and efficiency of power systems, and what are some key features or components that define it? Additionally, how is EPS typically implemented in modern power grids, and what challenges or benefits does it present for energy providers and consumers alike?