Preliminary Decommissioning Plan and Cost Estimate - Tamsin Ridge
4. Cost estimate (2023 dollars)
Item Cost Salvage or resale Net
Modules and trackers $4.9 million $3.6 million $1.3 million
Inverters, substation, collection system $1.8 million $1.1 million $0.7 million
Battery enclosures and power conversion $2.3 million $0.8 million $1.5 million
Piles, foundations, roads, fencing $1.5 million $0.4 million $1.1 million
Site restoration, tile repair, seeding $0.6 million - $0.6 million
Engineering, permits, contingency (10%) $0.5 million - $0.5 million
Quote starts. Total $11.6 million $5.9 million $5.7 million Quote ends.
Salvage values use 2023 scrap prices for steel, aluminum and copper and a conservative resale value for used
modules. Scrap prices are volatile, and salvage could fall well short of these figures.
5. Financial assurance
Northfold proposes a surety bond, posted before construction with the OPSB as obligee and with the
landowners as additional beneficiaries, and recalculated every five years. The statute requires the bond to equal
the decommissioning cost estimate; whether OPSB will accept the estimate net of salvage ($5.7 million) or
require the gross figure ($11.6 million) has not been settled. The leases require separate security for each
landowner, which the bond is intended to satisfy.
6. Plan updates
The plan and the estimate will be finalized with the OPSB application, resubmitted at least 60 days before
construction, and updated every five years of operation.
Anika Tessmer, P.E. (Ohio), Project Engineer, Tessmer Coyle Engineering, Inc.
Tessmer Coyle Engineering, Inc. - Job 2317 Page 2 of 2
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