Libertyville

Named in 5 PJM planning documents for 3 projects, from October 8, 2024 to July 7, 2026.

Existingdescribed as

COMEDzone

345 kV, 345kVkV as printed

5mentions

Projects naming this substation

Figures are from the most recent document naming each project, as printed. Each links to its page.

Project	Status as printed	Cost estimate	In-service date	Customer load	As of
Libertyville 345 kV ComEd-2024-010 · s3346	Conceptual	$35M	12/31/27	Not printed	2024-10-08 TEAC
Customer in Hoffman Estates ComEd-2024-016	Conceptual	$84.8M	9/1/2028	612 MW	2025-09-09 TEAC
Customer in Grayslake ComEd-2025-005	Conceptual	$248.8M	6/1/2027 (Phase 1), 6/1/2029 (Phase 2), 6/1/2030 (Phase 3), 6/1/2029 (138KV System Reinforcement), 6/1/2030 (345KV Auto, 345KV Silverlake-Grayslake, 345KV Wayne-Tollway), 6/1/2031 (345KV Tollway-Grayslake)	1,550 MW	2026-07-07 TEAC

Changes between documents

Where two documents print different values for the same project. A large change in a cost estimate can reflect a need being combined with others into one solution, not only a re-estimate; read both pages.

What changed	Printed values	Earlier	Later
Substations named	LIBERTYVILLE → LIBERTYVILLE; PROSPECT HGTS; ZION	2024-10-08	Not reported
Cost estimate	$174.8M → $248.8M	2026-03-10	2026-07-07
In-service date	6/30/2027 (Phase 1), 6/30/2029 (Phase 2), 6/30/2030 (Phase 3), 6/1/2029 (System Reinforcement) → 6/1/2027 (Phase 1), 6/1/2029 (Phase 2), 6/1/2030 (Phase 3), 6/1/2029 (138KV System Reinforcement), 6/1/2030 (345KV Auto, 345KV Silverlake-Grayslake, 345KV Wayne-Tollway), 6/1/2031 (345KV Tollway-Grayslake)	2026-03-10	2026-07-07
Substations named	BEVERLY ROAD; GRAYSLAKE; HANOVER TAP; LIBERTYVILLE; SILVER LAKE; SPAULDING → GRAYSLAKE; HANOVER TAP BLUE; HANOVER TAP RED; LIBERTYVILLE; SILVER LAKE; SPAULDING; TOLLWAY; WAYNE	2026-03-10	2026-07-07

Every mention

Date	Document	Project	What the document says about it
2026-09-08^*	SRRTEP Western ComEd local plan submission of the supplemental projects for 2024 RTEP p. 22	Libertyville 345 kV	“Libertyville 345 kV bus is currently a straight bus” 345 kV
2026-07-07	TEAC Item 12 - ComEd Supplemental Projects p. 9	Customer in Grayslake	“Cut into existing 345kV Silver Lake – Libertyville line” 345kV
2026-03-10	TEAC Item 08 - ComEd Supplemental Projects p. 7	Customer in Grayslake	No role wording 345kV
2025-09-09	TEAC Item 12 - ComEd Supplemental Projects p. 18	Customer in Hoffman Estates	“Cut into existing 345kV Libertyville – Tollway line” 345kV
2024-10-08	TEAC Informational Only - ComEd Local Plan Submission of the Supplemental Projects for 2024 p. 22	Libertyville 345 kV	“Libertyville 345 kV bus is currently a straight bus with two oil CBs and three SF6 CBs” 345 kV

* A local-plan posting carries no meeting date; the date shown is when pjm.com last modified the file.

Before relying on any of this

Names are machine-extracted from PDFs by a language model. Every exported name was checked to be printed in the PDF text; names read only from maps or diagrams are excluded.
An entry is a name within a transmission zone, not a verified physical facility. The same name in two zones is two entries; spelling variants are merged only when they differ by punctuation, case or a generic suffix such as "Substation".
role is "new" only where a cited document phrase describes the substation as new or describes constructing it, "existing" where a phrase describes work at it, otherwise "unknown".
Costs, dates, statuses and loads are the documents' own printed values for the most recent document that names the substation. Each one shipped here is printed on its cited page ("verification": "exact" or "on-page"); values that failed that check are withheld and counted in figures_withheld_unverified. None has been reviewed by a person.
Zone is the transmission owner whose deck presented the project. PJM-SYSTEM marks names from PJM's own reliability decks, which span zones.
A printed customer load is the amount a document states for a request. It says nothing about the substation's capability.