Interconnection and Transmission: desk report

The rule

Code computed the rating from the assessor's inputs:

extent=core, avoidable=partly -> 3

Set by the rule

Decision

Released

Evidence state

REPORTED · desktop, consultant or developer record

The assessor's comments

PJM queue AH1-931 has a feasibility study (April 14, 2022) listing total network upgrades of $31.4 million (plus or minus 50%); the project's share is not stated. Transmission Owner estimates 36 to 42 months after agreement execution, which may constrain the December 2026 date. No agreement in the data room; next study phase not started.

Worst case

The same rule on the worst case gives no rating above the point.

• Present: yes

  Grid-connected 120 MW solar with storage in PJM queue AH1-931 (C-edf1371b18, C-387e001e3f), 138 kV POI via 0.4-mile gen-tie (C-a21ca05339, C-4a00292b36).

  Cites C-edf1371b18, C-387e001e3f, C-a21ca05339, C-4a00292b36

• Extent: core

  Feasibility study found violations requiring network upgrades, totalling $31.4M at plus or minus 50% (C-fa0fe91ee0, C-9696e61ce3, C-bbdfdec1fc). No interconnection agreement is in the data room, the next study phase has not started and the position is in PJM's transition (C-502eff95b5). The Transmission Owner needs 36 to 42 months after agreement execution, against a December 2026 requested in-service date (C-cdf3d7697c, C-ddff0b0f72). Funding and schedule of required upgrades are unresolved, so grid access as a whole is in doubt. The gen-tie is short (C-a21ca05339).

  Cites C-fa0fe91ee0, C-9696e61ce3, C-bbdfdec1fc, C-502eff95b5, C-cdf3d7697c, C-ddff0b0f72, C-a21ca05339

• Avoidable: partly

  No short circuit violations or affected system impacts were found at feasibility stage only (C-ab3abd8d5e), and nothing in the record shows the position withdrawn or refused, so a route to the grid is not foreclosed. Upgrade cost, restudy in the reformed process and the 36 to 42 month build time are likely to change cost and schedule, and the December 2026 date looks difficult to meet (C-9696e61ce3, C-cdf3d7697c, C-502eff95b5). Kept at partly because no document shows a lack of workable route.

  Cites C-ab3abd8d5e, C-9696e61ce3, C-cdf3d7697c, C-502eff95b5

• Pathway: standard

  The feasibility study states a Facilities Study and Interconnection Service Agreement follow (C-9bf4e1b156). The position is moving to PJM's reformed process (C-502eff95b5), still a tariff process. No dispute or contested gen-tie siting appears in the record, and the 0.4-mile gen-tie is short (C-a21ca05339).

  Cites C-9bf4e1b156, C-502eff95b5, C-a21ca05339

• Impact likely: yes

  The study lists total network upgrades of $31.4M at planning-level accuracy, and the upgrade timeline may constrain the requested in-service date (C-9696e61ce3, C-bbdfdec1fc, C-cdf3d7697c). The project's own share of this total is not shown in the record.

  Cites C-9696e61ce3, C-bbdfdec1fc, C-cdf3d7697c

Supporting statements (12)

Each claim the row cites: the statement in the assessor's words, then the quote the engine found on the page.

1. C-387e001e3f

   Interconnection is in PJM.

   PJM queue position AH1-931; the interconnection request was submitted on September 24, 2021.

   Tamsin Ridge Solar and Storage Project - Project Description · DR-0001 · Page 1 · 2023-06-12

   Source developer_document · Claim type project_fact · Polarity neutral · Confidence high · Quote check exact, 100 of 100

   See it on page 1, claim C-387e001e3f

2. C-4a00292b36

   Proposed point of interconnection is a new Tamsin Ridge 138 kV switching station on the Vesper Hill-Ardley 138 kV line.

   Proposed Tamsin Ridge 138 kV switching station (new three-breaker ring bus)

   Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 1 · 2022-04-14

   Source agency_determination · Claim type project_fact · Polarity neutral · Confidence high · Quote check exact, 100 of 100

   See it on page 1, claim C-4a00292b36

3. C-502eff95b5

   The position is in PJM's transition to its reformed process and the next study phase has not started.

   The position is now in PJM's transition to its reformed interconnection process, and the next study phase has not started.

   Tamsin Ridge Solar and Storage Project - Project Description · DR-0001 · Page 1 · 2023-06-12

   Source developer_document · Claim type data_gap · Polarity presence · Confidence high · Quote check exact, 100 of 100

   See it on page 1, claim C-502eff95b5

4. C-9696e61ce3

   Total network upgrades allocated to AH1-931 are estimated at $31.4 million.

   Total network upgrades $31.4 million

   Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 1 · 2022-04-14

   Source agency_determination · Claim type cost · Polarity presence · Confidence high · Quote check exact, 100 of 100

   See it on page 1, claim C-9696e61ce3

5. C-9bf4e1b156

   Feasibility study is complete; System Impact Study, Facilities Study and Interconnection Service Agreement follow.

   will be followed by a Facilities Study and an Interconnection Service Agreement.

   Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 2 · 2022-04-14

   Source agency_determination · Claim type project_fact · Polarity neutral · Confidence medium · Quote check exact, 100 of 100

   See it on page 2, claim C-9bf4e1b156

6. C-a21ca05339

   Interconnection voltage is 138 kV via a 0.4-mile gen-tie.

   reached by a 0.4-mile 138 kV gen-tie line

   Tamsin Ridge Solar and Storage Project - Project Description · DR-0001 · Page 1 · 2023-06-12

   Source developer_document · Claim type project_fact · Polarity neutral · Confidence high · Quote check exact, 100 of 100

   See it on page 1, claim C-a21ca05339

7. C-ab3abd8d5e

   No short circuit violations were found and no affected system impacts were identified at this stage.

   No short circuit violations were found. No affected system impacts were identified at this stage.

   Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 2 · 2022-04-14

   Source agency_determination · Claim type absence · Polarity absence · Confidence high · Quote check exact, 100 of 100

   See it on page 2, claim C-ab3abd8d5e

8. C-bbdfdec1fc

   Cost estimates are planning-level with accuracy of about plus or minus 50 percent and may change.

   The costs above are planning-level estimates with an accuracy of about plus or minus 50 percent.

   Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 2 · 2022-04-14

   Source agency_determination · Claim type cost · Polarity presence · Confidence high · Quote check exact, 100 of 100

   See it on page 2, claim C-bbdfdec1fc

9. C-cdf3d7697c

   Transmission Owner estimates 36 to 42 months after interconnection agreement execution to complete upgrades, which may constrain the requested in-service date.

   The Transmission Owner estimates 36 to 42 months from execution of an interconnection agreement to complete the switching station and the network upgrades

   Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 2 · 2022-04-14

   Source agency_determination · Claim type schedule · Polarity presence · Confidence high · Quote check exact, 100 of 100

   See it on page 2, claim C-cdf3d7697c

10. C-ddff0b0f72

    Requested in-service date is December 2026.

    Requested in-service date December 2026

    Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 1 · 2022-04-14

    Source agency_determination · Claim type project_fact · Polarity neutral · Confidence medium · Quote check exact, 100 of 100

    See it on page 1, claim C-ddff0b0f72

11. C-edf1371b18

    Queue position is AH1-931.

    Queue position AH1-931, "Tamsin Ridge 138 kV".

    Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 1 · 2022-04-14

    Source agency_determination · Claim type project_fact · Polarity neutral · Confidence high · Quote check exact, 100 of 100

    See it on page 1, claim C-edf1371b18

12. C-fa0fe91ee0

    Feasibility study found reliability violations under deliverability and multiple facility contingency tests requiring network upgrades.

    The study found reliability violations under the generator deliverability and multiple facility contingency tests that require network upgrades.

    Generation Interconnection Feasibility Study Report - Queue Position AH1-931 · DR-0021 · Page 1 · 2022-04-14

    Source agency_determination · Claim type study_finding · Polarity presence · Confidence high · Quote check exact, 100 of 100

    See it on page 1, claim C-fa0fe91ee0

• Obtain PJM status letter on transition timing and the project's share of upgrade costs.
• Re-baseline COD against the 36 to 42 month build time and the plus or minus 50% estimate.
• Confirm deposits are current and obtain the gen-tie route and permit needs.

Agencies