Monocacy Substation
Named in 11 PJM planning documents for 5 projects, from October 8, 2024 to October 6, 2026.
Existingdescribed as
APSzone
230 kV, 230/138 kVkV as printed
15mentions
Also printed as: Monocacy
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 |
|---|---|---|---|---|---|
| Misoperation Relay Projects APS-2024-002, APS-2024-003, APS-2024-004 · s3353.1, s3354.1, s3355.1 |
Not printed | Not printed | Not printed | Not printed | 2024-10-08 TEAC |
| Misoperation Relays APS-2024-059 · s3526.1 |
Not printed | $4.0 | 04/06/2029 | Not printed | 2024-10-08 TEAC |
| Monocacy No. 4 230/138 kV Transformer APS-2024-061 · s3573.1 |
Not printed | $9.00 M | 12/31/2027 | Not printed | 2025-10-08 TEAC |
| APS Transmission Zone M-3 Process Frederick, MD/Monocacy, MD APS-2025-001 · S3656.1 |
Not printed | $ 3.9 M | 11/24/2027 | Not printed | 2025-10-08 TEAC |
| Eaglehead - Monocacy 230 kV Line APS-2025-003 · s3869.1 |
Not printed | $3.88M | 08/24/2029 | 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 | BELMONT; LIME KILN; MONOCACY; PLEASANTS UNIT 1; PLEASANTS UNIT 2 → BELMONT; LIME KILN; MONOCACY | 2024-10-08 | Not reported |
Every mention
| Date | Document | Project | What the document says about it |
|---|---|---|---|
| 2026-10-06 | TEAC Informational Only - APS Local Plan Submission of the Supplemental Projects for 2026 p. 37 |
Eaglehead - Monocacy 230 kV Line | “At Monocacy Substation: Replace 230 kV disconnect switches, substation conductor, CVT, CT, surge arresters, and relaying.” 230 kV |
| 2026-09-28* | SRRTEP Western APS local plan submission of the supplemental projects for 2026 RTEP p. 37 |
Eaglehead - Monocacy 230 kV Line | “At Monocacy Substation: Replace 230 kV disconnect switches” 230 kV |
| 2026-09-08* | SRRTEP Western APS local plan submission of the supplemental projects for 2024 RTEP p. 136 |
Misoperation Relays | “replace circuit breaker, disconnect switches, substation conductor and relaying” 230 kV |
| 2026-09-08* | SRRTEP Western APS local plan submission of the supplemental projects for 2024 RTEP p. 88 |
Misoperation Relay Projects | “At Monocacy, replace disconnect switches, wave trap, line tuner, and coax, substation conductor, CTs and relaying” 230 kV |
| 2026-09-08* | SRRTEP Western APS local plan submission of the supplemental projects for 2025 RTEP p. 45 |
APS Transmission Zone M-3 Process Frederick, MD/Monocacy, MD | “At Monocacy Substation:
- Replace (1) - 230 kV Circuit Breaker” 230 kV |
| 2026-09-08* | SRRTEP Western APS local plan submission of the supplemental projects for 2025 RTEP p. 9 |
Monocacy No. 4 230/138 kV Transformer | “At Monocacy Substation:
▪ Replace No. 4 230/138 kV 224 MVA Transformer” 230/138 kV |
| 2025-11-04 | TEAC Item 04 - APS Supplemental Projects - Version 7 p. 6 |
Eaglehead - Monocacy 230 kV Line | “At Monocacy Substation: Replace 230 kV disconnect switches” 230 kV |
| 2025-10-08 | TEAC Informational Only - APS Local Plan Submission of the Supplemental Projects for 2025 p. 45 |
APS Transmission Zone M-3 Process Frederick, MD/Monocacy, MD | “At Monocacy Substation:
- Replace (1) - 230 kV Circuit Breaker” 230 kV |
| 2025-10-08 | TEAC Informational Only - APS Local Plan Submission of the Supplemental Projects for 2025 p. 9 |
Monocacy No. 4 230/138 kV Transformer | “At Monocacy Substation:
§ Replace No. 4 230/138 kV 224 MVA Transformer” 230/138 kV |
| 2025-04-01 | TEAC Item 04 - APS Supplemental Projects p. 12 |
APS Transmission Zone M-3 Process Frederick, MD/Monocacy, MD | “At Monocacy Substation: - Replace (1) - 230 kV Circuit Breaker” |
| 2025-03-04 | TEAC Item 05 - APS Supplemental projects p. 3 |
Eaglehead - Monocacy 230 kV Line | No role wording 230 kV |
| 2025-02-04 | TEAC Item 05 - APS Supplemental Project p. 3 |
APS Transmission Zone M-3 Process Frederick, MD/Monocacy, MD | “associated disconnect switches and protective relaying at Frederick A and Monocacy substations are aging with increasing maintenance concerns” 230 kV |
| 2024-11-06 | TEAC Item 04 - APS Supplemental Projects p. 8 |
Monocacy No. 4 230/138 kV Transformer | “At Monocacy Substation: Replace No. 4 230/138 kV 224 MVA Transformer” 230/138 kV |
| 2024-10-08 | TEAC Informational Only - APS Local Plan submission of supplemental project 2024 p. 136 |
Misoperation Relays | “At Monocacy, replace circuit breaker, disconnect switches, substation conductor and relaying” |
| 2024-10-08 | TEAC Informational Only - APS Local Plan submission of supplemental project 2024 p. 88 |
Misoperation Relay Projects | “At Monocacy, replace disconnect switches, wave trap, line tuner, and coax, substation conductor, CTs and relaying” 230 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.