PJM Interconnection
Interconnection Planning
Generation Interconnection Feasibility Study Report
Queue position AH1-931, "Tamsin Ridge 138 kV". April 14, 2022.
1. Introduction
This report presents the results of the feasibility study for queue position AH1-931, submitted by Tamsin Ridge
Solar, LLC (the Interconnection Customer) on September 24, 2021. The study assesses the impact of the
proposed generating facility on the PJM transmission system and gives a preliminary estimate of the cost of the
facilities needed to interconnect it.
2. Project description
Item Value
Location Harrison Township, Carroll County, Ohio
Fuel Solar with battery storage
Maximum facility output (MFO) 120 MW
Capacity interconnection rights requested 72 MW
Point of interconnection Proposed Tamsin Ridge 138 kV switching station (new three-breaker ring bus)
on the Transmission Owner's Vesper Hill-Ardley 138 kV line
Requested in-service date December 2026
3. Summary of results
The study found reliability violations under the generator deliverability and multiple facility contingency tests that
require network upgrades. Preliminary costs allocated to AH1-931:
Facility Description Estimated cost
Attachment facilities Gen-tie termination, revenue metering, relaying $1.2 million
Direct connection New 138 kV ring bus switching station and line tap $7.4 million
Network upgrade NU-1 Reconductor 9.6 miles of the Ardley-Pine Fork 138 kV line $24.8 million
Network upgrade NU-2 Replace two 138 kV circuit breakers at Vesper Hill $1.9 million
Network upgrade NU-3 (share) Ardley 345/138 kV transformer replacement, allocated share $4.7 million
Quote starts. Total network upgrades $31.4 million Quote ends.
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