Darby Substation
Named in 3 PJM planning documents for 2 projects, from July 8, 2025 to February 3, 2026.
Existingdescribed as
DAYTONzone
138kVkV as printed
4mentions
Also printed as: Darby
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 |
|---|---|---|---|---|---|
| Dayton-2025-003 | Conceptual | $74.1M | 4/2028 | 135 MW | 2025-09-09 TEAC |
| Dayton-2025-008 | Conceptual | $246M | 05/01/2031 | 800 MW | 2026-02-03 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 |
|---|---|---|---|
| In-service date | 7/2028 → 4/2028 | 2025-07-08 | 2025-09-09 |
| Substations named | DARBY → DARBY; MILLCREEK; PEORIA | 2025-07-08 | 2025-09-09 |
| In-service date | 1/2029 → 05/01/2031 | 2025-09-09 | 2026-02-03 |
| Substations named | DARBY → DARBY; FLATLICK AEP; MARYSVILLE AEP; PATINA; PEORIA; WEAVER | 2025-09-09 | 2026-02-03 |
Every mention
| Date | Document | Project | What the document says about it |
|---|---|---|---|
| 2026-02-03 | TEAC Item 06 - Dayton Supplemental Projects p. 6 |
Dayton-2025-008 | No role wording |
| 2025-09-09 | TEAC Item 07 - Dayton Supplemental Projects p. 3 |
Dayton-2025-008 | No role wording |
| 2025-09-09 | TEAC Item 07 - Dayton Supplemental Projects p. 6 |
Dayton-2025-003 | “existing Darby” 138kV |
| 2025-07-08 | TEAC Item 05 - Dayton Supplemental Projects p. 3 |
Dayton-2025-003 | “vicinity of its Darby Substation” |
* 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.