The process starts with a diverse mix of generating sources.
Substations connect the transmission system to the distribution system.
Substations are critical junctions and switching points in the electric system. The distribution system links the transmission system and most customers. This document is also available as a 145k file in Adobe Acrobat's .pdf format. If you don't have the free Adobe Acrobat Reader, follow this link to find download information about the freeware version for the type of computer that you work on.