Zion
Named in 6 PJM planning documents for 3 projects, from March 4, 2025 to October 6, 2026.
Existingdescribed as
COMEDzone
345 kV, 345kVkV as printed
7mentions
Also printed as: Zion Station
PJM interconnection queue
A PJM queue substation page has the same name: Zion (IL) — 5 queue requests filed, 3 active.
Same name and transmission owner. Matched on name and transmission owner: the utility that presented this substation in PJM planning materials is the transmission owner recorded on the queue filings at a substation of the same name. Not verified as the same facility.
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 | 2026-09-08* SRRTEP Western |
| Zion 345 kV CBs ComEd-2025-024 |
Conceptual | $ 12.7 M | 12/31/2027 | Not printed | 2025-12-08 TEAC |
| MISO Tranche 2.1 Request ComEd 2024-023 · s3843 |
Conceptual | $908.7M | 6/1/2034 | Not printed | 2026-10-06 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 |
| Substations named | ZION → PLEASANT PRAIRIE; WAUKEGAN; ZION | 2025-11-04 | 2025-12-08 |
| Cost estimate prior value printed on the same page |
$874.2M → $908.7M | 2025-11-04 | 2025-11-04 |
| Cost estimate | $874.2M* → $908.7M | 2025-03-04 | 2025-11-04 |
| Substations named | BABCOCK; COLLINS; GREEN ACRES; KATYDID; LAKEVIEW; NEVADA; OLIVE; PARIS; PLEASANT PRAIRIE; POWERTON; UNIVERSITY PARK; WOODFORD COUNTY; ZION → BABCOCK; COLLINS; DES PLAINES; GREEN ACRES; KATYDID; LAKEVIEW; NEVADA; OLIVE; PARIS; PLEASANT PRAIRIE; POWERTON; UNIVERSITY PARK; WOODFORD COUNTY; ZION | 2025-03-04 | 2025-11-04 |
Every mention
| Date | Document | Project | What the document says about it |
|---|---|---|---|
| 2026-10-06 | TEAC Informational Only - ComEd Local Plan Submission of Supplemental Projects for 2026 p. 7 |
MISO Tranche 2.1 Request | “Replace 345 kV BT 5-6 and BT 17-18 oil CBs at Zion” 345 kV |
| 2026-09-30* | SRRTEP Western ComEd local plan submission of the supplemental projects for 2026 RTEP p. 7 |
MISO Tranche 2.1 Request | “Replace 345 kV BT 5-6 and BT 17-18 oil CBs at Zion” 345 kV |
| 2026-09-08* | SRRTEP Western ComEd local plan submission of the supplemental projects for 2024 RTEP p. 23 |
Libertyville 345 kV | No role wording 345 kV |
| 2025-12-08 | TEAC Item 09 - ComEd Supplemental Projects p. 3 |
Zion 345 kV CBs | “Zion 345 kV BT oil circuit breakers BT 2-3, BT 2-17, BT 3-4, BT 4-5, BT 6-7, BT 7-20, BT 18-19, & BT19-20 were installed from 1970 to 1972” 345 kV |
| 2025-11-04 | TEAC Item 11 - ComEd Supplemental Projects p. 10 |
MISO Tranche 2.1 Request | “Replace 345 kV BT 5-6 and BT 17-18 oil CBs at Zion” 345 kV |
| 2025-11-04 | TEAC Item 11 - ComEd Supplemental Projects p. 3 |
Zion 345 kV CBs | “Zion 345 kV BT oil circuit breakers BT 2-3, BT 2-17, BT 3-4, BT 4-5, BT 6-7, BT 7-20, BT 18-19, & BT19-20 were installed from 1970 to 1972.” 345 kV |
| 2025-03-04 | TEAC Item 11 - ComEd Supplemental Projects p. 8 |
MISO Tranche 2.1 Request | “Pleasant Prairie-Zion 345kV transmission lines” 345kV |
* 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.