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
Worst case
The same rule on the worst case gives no rating above the point.
Scenario
Restudy raises upgrade costs toward the top of the plus or minus 50% band, affected-system impacts appear, and the 36 to 42 month build leaves no workable route to the December 2026 COD.
Step still pending
System Impact and Facilities Studies under PJM's reformed process
Core and partly are reasonable, but OPSB is unsupported on this row, the $31.4M is called 'allocated' when the quote says total, and the December 2026 schedule risk is understated given that no studies or agreement are in place. Some status statements are unsupported.
Revised once after the first critique. Rating unchanged.
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).
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system impacts were found at feasibility stage only (C-ab3abd8d5e), and nothing in the record shows the position withdrawn or refused, so a route to the grid is not foreclosed.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.
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).
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.
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.
Critique
Verdict
upheld
Suggested direction for the rating
same
Summary
Assessment is largely supported by the cited quotes. Core extent and partly avoidable are defensible. Minor issues: schedule risk is understated as 'may constrain', a few inferences (restudy, funding unresolved) are not quoted, and the FERC and Ohio gen-tie review next steps are missing.
Critic model
Luminol
Issues
Severity minor · Kind understatement
Comments and avoidable rationale say the December 2026 date 'may constrain' or 'looks difficult'. The cited quotes show 36-42 months from agreement execution. As of 2023-08-01 no agreement exists and the next study phase has not started. So even immediate execution would not clearly meet December 2026, and the date is very likely unachievable. Wording should be firmer. The category is unchanged.
'Funding and schedule of required upgrades are unresolved' and 'restudy in the reformed process' are inferences. The quotes say only that the next study phase has not started and the position is moving to the reformed process. No quote says restudy will occur or that funding is unresolved.
Agencies list omits FERC, whose tariff governs PJM. The gen-tie route may need state review (Ohio Power Siting Board) if it is not covered by the PE-02 certificate. A next step should confirm whether the 0.4-mile 138 kV gen-tie sits inside the PE-02 siting application. Also request an updated study or PJM transition schedule, since the feasibility study is over a year old.
Quote check Exact · Placed verbatim · The quote occurs on the page exactly as written. · Read as docx
Northfold Energy Partners, LLC - Confidential
Tamsin Ridge Solar and Storage Project
Project Description, Revision 3. Prepared by Northfold Energy Partners, LLC. June 12, 2023.
1. Overview
The Tamsin Ridge Solar and Storage Project (the Project) is a proposed 120 MW (AC) solar photovoltaic generating facility of approximately 168 MW (DC) with a co-located 60 MW / 240 MWh battery energy storage system (BESS). Northfold Energy Partners, LLC is developing the Project through its project company, Tamsin Ridge Solar, LLC. The Project is in Harrison Township, Carroll County, Ohio, west of State Route 43 and about 4 miles northwest of the Village of Carrollton.
2. Site
The Project Area covers approximately 1,140 acres on 14 parcels held by 9 landowners. The fenced area is approximately 780 acres, in a West Block and an East Block separated by the Sallow Creek valley. Land cover is cropland and hay with woodlots along Sallow Creek and on reclaimed surface-mined ground in the East Block. An existing 138 kV transmission line crosses the West Block, and natural gas gathering pipelines cross Parcels 5, 7 and 10. There are 23 residences within 1,000 feet of the fence.
3. Facility
Single-axis trackers; 40 central inverters of 3.0 MW each; a 34.5/138 kV project substation and the BESS yard (about 6 acres, 60 lithium iron phosphate enclosures) on Parcel 5; underground 34.5 kV collection lines; about 9 miles of gravel access roads; perimeter fencing; and an operations building. Modules carry a hail impact rating and the trackers have an automatic hail stow mode. Structures are designed for an ASCE 7-16 basic wind speed of 115 mph and a 20 psf ground snow load.
4. Interconnection
Quote starts. PJM queue position AH1-931; the interconnection request was submitted on September 24, 2021. Quote ends. The point of interconnection is the proposed Tamsin Ridge 138 kV switching station on the Transmission Owner's Vesper Hill-Ardley 138 kV line, reached by a 0.4-mile 138 kV gen-tie line. PJM issued the Feasibility Study report on April 14, 2022. The position is now in PJM's transition to its reformed interconnection process, and the next study phase has not started.
5. Permitting and schedule
The Project needs a certificate of environmental compatibility and public need from the Ohio Power Siting Board (OPSB). The pre-application conference with OPSB staff was held on March 21, 2023, and the county public meeting required by ORC 303.61 was held on May 11, 2023. The OPSB application is planned for the third quarter of 2023, construction from the first quarter of 2025, and commercial operation in December 2026.
No federal land, federal funding or federal loan program is involved. A U.S. Army Corps of Engineers nationwide permit is expected for one access road crossing of an ephemeral stream.
6. Site control
Option-to-lease agreements cover 12 parcels, a recorded collection line easement covers Parcel 7, and Parcel 11 is not yet under agreement (see the Option and Lease Summary and the Parcel Schedule).
This document has no page picture (only PDF and image documents have one).
C-387e001e3f
Interconnection is in PJM.
Quoted from page 1
PJM queue position AH1-931; the interconnection request was submitted on September 24, 2021.
Transmission Owner estimates 36 to 42 months after interconnection agreement execution to complete upgrades, which may constrain the requested in-service date.
Quoted from page 2
The Transmission Owner estimates 36 to 42 months from execution of an interconnection agreement to
complete the switching station and the network upgrades
The requirements the assessor tied to this row, by level. Each quote from dated law is shown with its source.
No requirement is tied to this row.
Information requests
IR-b24dc38cf1 · High priority
Provide the executed or draft interconnection agreement for the project area, or confirm none exists.
Missing evidence
Executed or draft interconnection agreement
Consequence
Interconnection and Transmission is rated on partial evidence without it.
Blocks the decision
No
Raised by
completeness
IR-78fe2a615a · High priority
Provide the gen-tie route study, line siting application or route map for the project area, or confirm none exists.
Missing evidence
Gen-tie route study, line siting application or route map
Consequence
Interconnection and Transmission is rated on partial evidence without it.
Blocks the decision
No
Raised by
completeness
Next steps
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
PJM
Transmission Owner
Cost and impact
Impact
C, S
Potential cost level
M-H
Why
Network upgrades totalling $31.4M at plus or minus 50%, with the project's share not stated, plus the project's own interconnection facilities and gen-tie (no figure in the record). Schedule exposure against the December 2026 COD.
Impact: C = cost, S = schedule. Potential cost level: L, L-M, M, M-H, H (relative to a utility-scale solar budget).
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.