Substation
The facility transforming and switching power between transmission and the site, a major long-lead build item.
Current numbers
IEEE Std 80-2013 (inactive-reserved); P80 revision active PARsubstation grounding standard bounding step/touch voltage against body-current limits and soil resistivity
~128–208 wkHV/substation power transformer lead time (standard); up to ~60 months in constrained markets — often the schedule's long pole
~128–208 wkHV/substation transformer lead time (GSU ~144–208 wk; up to ~60 mo constrained) — OFE-by-default, pre-GC