Des Plaines
Named in 12 PJM planning documents for 6 projects, from October 8, 2024 to October 6, 2026.
Existingdescribed as
COMEDzone
138 kV, 345 kV, 345/138 kV, 345KV/138KV, 345kVkV as printed
13mentions
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 |
|---|---|---|---|---|---|
| Customer in Elk Grove ComEd-2023-008 · s3582.1, s3582.2 |
Engineering | $158M | 12/31/2026 (s3582.1), 12/31/2026 (s3582.2) | 378 MW | 2025-10-08 TEAC |
| Des Plaines 345/138 kV Transformer 83 ComEd-2023-011 · s3157 |
Engineering | $24.1M | 12/31/25 | Not printed | 2024-10-08 TEAC |
| Cluster 2 ComEd-2024-004 |
Not printed | $14.31 M | 6/1/2029 | Not printed | 2024-12-03 TEAC |
| Des Plaines 345 kV CBs ComEd-2025-026 |
Conceptual | $3.9M | 12/31/2027 | Not printed | 2025-12-08 TEAC |
| Des Plaines 345KV/138KV TR 34KV Tertiary Caps ComEd-2026-010 |
Engineering | $ 10.91M | 12/31/2027 (Phase 1), 12/31/28 (Phase 2) | Not printed | 2026-07-17 SRRTEP Western |
| 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 | DES PLAINES; ELK GROVE; LOMBARD; ROLLING MEADOWS; SCHAUMBURG → DES PLAINES; ELK GROVE; LOMBARD; SCHAUMBURG | 2025-10-08 | Not reported |
| Cost estimate | $14.31 M → $40.6M | 2024-12-03 | 2025-10-08 |
| In-service date | 6/1/2029 → 12/31/2026 (s3583.1), 12/31/2027 (s3583.2) | 2024-12-03 | 2025-10-08 |
| Substations named | BUSSE; DES PLAINES; ITASCA → ELK GROVE EAST; ITASCA | 2024-12-03 | 2025-10-08 |
| Substations named | DES PLAINES → DES PLAINES; ITASCA | 2025-11-04 | 2025-12-08 |
| Substations named | DES PLAINES → BUSSE; DES PLAINES; GOLF MILL | 2026-06-17 | 2026-07-17 |
| 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 1-5, BT 2-5, BT 2-3, L4620, L4621, and L12006 oil CBs at Des Plaines” 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 1-5, BT 2-5, BT 2-3, L4620, L4621, and L12006 oil CBs at Des Plaines” 345 kV |
| 2026-09-08* | SRRTEP Western ComEd local plan submission of the supplemental projects for 2025 RTEP p. 12 |
Customer in Elk Grove | No role wording 345kV |
| 2026-09-08* | SRRTEP Western ComEd local plan submission of the supplemental projects for 2024 RTEP p. 10 |
Des Plaines 345/138 kV Transformer 83 | “Des Plaines 345/138 kV Transformer 83” 345/138 kV |
| 2026-07-17 | SRRTEP Western Item 05 - ComEd Supplemental Projects p. 4 |
Des Plaines 345KV/138KV TR 34KV Tertiary Caps | “Remove the 34KV 108MVAR Tertiary Capacitor Banks on Des Plaines” 345KV/138KV |
| 2026-06-17 | SRRTEP Western Item 05 - ComEd Supplemental Projects p. 3 |
Des Plaines 345KV/138KV TR 34KV Tertiary Caps | “Des Plaines autotransformer 345KV/138KV TR84” 345KV/138KV |
| 2025-12-08 | TEAC Item 09 - ComEd Supplemental Projects p. 7 |
Des Plaines 345 kV CBs | “Des Plaines 345 kV oil circuit breakers L10111 & L10112 were
installed in 1966 and 1977, respectively” 345 kV |
| 2025-11-04 | TEAC Item 11 - ComEd Supplemental Projects p. 10 |
MISO Tranche 2.1 Request | “Replace 345 kV BT 1-5, BT 2-5, BT 2-3, L4620, L4621, and L12006 oil CBs at Des Plaines” 345 kV |
| 2025-11-04 | TEAC Item 11 - ComEd Supplemental Projects p. 5 |
Des Plaines 345 kV CBs | “Des Plaines 345 kV BT oil circuit breakers L10111 & L10112 were installed in 1966 and 1977, respectively.” 345 kV |
| 2025-10-08 | TEAC Informational Only - ComEd Local Plan Submission of the Supplemental Projects for 2025 p. 12 |
Customer in Elk Grove | No role wording 345kV |
| 2024-12-03 | TEAC Item 11 - Reliability Analysis Update p. 55 |
Cluster 2 | No role wording 138 kV |
| 2024-11-06 | TEAC Item 13 - Reliability Analysis Update p. 36 |
Cluster 2 | No role wording 138 kV |
| 2024-10-08 | TEAC Informational Only - ComEd Local Plan Submission of the Supplemental Projects for 2024 p. 10 |
Des Plaines 345/138 kV Transformer 83 | “Replace 345/138 kV autotransformer with a new standard autotransformer” 345/138 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.