Thornburg
Named in 4 PJM planning documents for 7 projects, from May 8, 2026 to October 6, 2026.
Newdescribed as
DOMzone
500/230kV, 500kVkV as printed
10mentions
Described as new: “new substation called Thornburg” — source, page 14
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 |
|---|---|---|---|---|---|
| Dominion Transmission Zone: Baseline New 500kV Line North Anna - Thornburg - Bristers b4000.344 & b4000.345 |
Not printed | $661.63M | 9/16/2030 | Not printed | 2026-05-08 TEAC |
| Thornburg 500/230kV Substation (Line #568 Ladysmith – Possum Point Cut-In) b4000.351 & b4000.352 |
Not printed | $7.2M | 9/16/2030 | Not printed | 2026-10-06 TEAC |
| Thornburg 500/230kV Substation (Bypass Elmont & Possum Point 500kV) b4053.34 |
Not printed | $1M | 6/1/2032 | Not printed | 2026-10-06 TEAC |
| Dominion Transmission Zone: Supplemental Do No Harm Analysis DOM-2023-0016 · s3731 |
Engineering | $27 M | 05/31/2025 | 248.0 MW | 2026-10-06 TEAC |
| Orrock (Matta) 230kV Delivery - DEV DOM-2023-0023 · s3990 |
Engineering | $25.5 M | 11/15/2026 | 300 MW | 2026-10-06 TEAC |
| Dominion Transmission Zone: Supplemental Operational Flexibility and Efficiency DOM-2024-0051 · s3999 |
Engineering | $185M | 12/31/2030 | Not printed | 2026-10-06 TEAC |
| Install 230 kV Conductor on North Anna to Bristers Structures DOM-2026-0022 · s4032 |
Engineering | $33.75 M | Q4 2030 | 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 |
|---|---|---|---|
| Cost estimate prior value printed on the same page |
$704.25 M → $704.33 M | 2025-01-07 | 2025-01-07 |
| Cost estimate prior value printed on the same page |
$571.63M → $661.63M | 2026-05-08 | 2026-05-08 |
| Cost estimate | $704.33 M → $661.63M | 2025-01-07 | 2026-05-08 |
| In-service date | 6/1/2029 → 9/16/2030 | 2025-01-07 | 2026-05-08 |
| Substations named | ELMONT; KRAKEN; LADYSMITH; NORTH ANNA; POSSUM POINT; YEAT → AQUIA HARBOR; BRISTERS; KRAKEN; LADYSMITH; NORTH ANNA; STAFFORD; THORNBURG | 2025-01-07 | 2026-05-08 |
| Cost estimate | $27.0 M → $450.0M | 2025-04-01 | 2026-06-02 |
| Cost estimate | $450.0M → $27 M | 2026-06-02 | 2026-10-06 |
| In-service date | 05/31/2025 → 07/01/2029 | 2025-04-01 | 2026-06-02 |
| In-service date | 07/01/2029 → 05/31/2025 | 2026-06-02 | 2026-10-06 |
| Substations named | ALLMAN; ELMONT; FOUR RIVERS; FREDERICKSBURG; KRAKEN; LADYSMITH; LADYSMITH CT; LEES HILL; N DOSWELL; NEW POST; PINEWOOD; RUTHER GLEN; ST JOHNS → ALLMAN; CHANCELLOR; ELMONT; FOUR RIVERS; FREDERICKSBURG; KRAKEN; LADYSMITH; LADYSMITH CT; LEES HILL; N DOSWELL; NEW POST; PINEWOOD; POSSUM POINT; RUTHER GLEN; ST JOHNS; THORNBURG | 2025-04-01 | 2026-06-02 |
| Substations named | ALLMAN; CHANCELLOR; ELMONT; FOUR RIVERS; FREDERICKSBURG; KRAKEN; LADYSMITH; LADYSMITH CT; LEES HILL; N DOSWELL; NEW POST; PINEWOOD; POSSUM POINT; RUTHER GLEN; ST JOHNS; THORNBURG → ALLMAN; ELMONT; FOUR RIVERS; FREDERICKSBURG; KRAKEN; LADYSMITH; LADYSMITH CT; NEW POST; PINEWOOD; POSSUM POINT; RUTHER GLEN; ST JOHNS; THORNBURG | 2026-06-02 | 2026-10-06 |
| Substations named | KRAKEN; LADYSMITH CT; MATTA → LADYSMITH CT; ORROCK MATTA; THORNBURG | 2025-09-09 | 2026-10-06 |
| Cost estimate prior value printed on the same page |
$108M → $165M | 2026-06-02 | 2026-06-02 |
| Cost estimate | Transmission: $108M; Substation: $15M → $165M | 2025-06-05 | 2026-06-02 |
| Cost estimate | $165M → $185M | 2026-06-02 | 2026-10-06 |
| Status | conceptual (Conceptual) → engineering (Engineering) | 2025-06-05 | 2026-06-02 |
| Substations named | BRISTERS; ELMONT; FREDERICKSBURG; NORTH ANNA; THORNBURG → BRISTERS; NORTH ANNA; THORNBURG | 2026-06-02 | 2026-10-06 |
Every mention
| Date | Document | Project | What the document says about it |
|---|---|---|---|
| 2026-10-06 | TEAC Informational Only - Dominion Local Plan Submission of the Supplemental Projects 2026 p. 101 |
Orrock (Matta) 230kV Delivery - DEV | No role wording |
| 2026-10-06 | TEAC Informational Only - Dominion Local Plan Submission of the Supplemental Projects 2026 p. 51 |
Dominion Transmission Zone: Supplemental Do No Harm Analysis | “Expand Thornburg (fka Kraken) 500kV Switching Station” 500kV |
| 2026-10-06 | TEAC Informational Only - Dominion Local Plan Submission of the Supplemental Projects 2026 p. 69 |
Dominion Transmission Zone: Supplemental Operational Flexibility and Efficiency | “Terminate one 230kV conductor rated at 1573 MVA at Thornburg and Chickahominy.” |
| 2026-10-06 | TEAC Informational Only - Dominion Local Plan Submission of the Supplemental Projects 2026 p. 81 |
Install 230 kV Conductor on North Anna to Bristers Structures | No role wording |
| 2026-10-06 | TEAC Item 16 - Reliability Analysis Update - Presentation p. 8 |
Thornburg 500/230kV Substation (Line #568 Ladysmith – Possum Point Cut-In) | No role wording 500/230kV |
| 2026-10-06 | TEAC Item 16 - Reliability Analysis Update - Presentation p. 9 |
Thornburg 500/230kV Substation (Bypass Elmont & Possum Point 500kV) | “removing line terminations at Thornburg (bypassing the Thornburg substation)” 500/230kV |
| 2026-06-02 | TEAC Item 11 - DOM Supplemental Projects p. 10 |
Dominion Transmission Zone: Supplemental Do No Harm Analysis | “Expand Thornburg (fka Kraken) 500kV Switching Station” 500kV |
| 2026-06-02 | TEAC Item 11 - DOM Supplemental Projects p. 14 |
Dominion Transmission Zone: Supplemental Operational Flexibility and Efficiency | No role wording |
| 2026-06-02 | TEAC Item 11 - DOM Supplemental Projects p. 7 |
Install 230 kV Conductor on North Anna to Bristers Structures | No role wording |
| 2026-05-08 | TEAC Item 10 - Reliability Analysis Update p. 14 |
Dominion Transmission Zone: Baseline New 500kV Line North Anna - Thornburg - Bristers | “new substation called Thornburg” |
* 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.