Nova Scotia Power filed responses to NSEB Information Requests 1–10 on the $6.96M L5031 Hubbards to East Chester transmission line replacement project, disclosing mobile substation removal, bypass structure costs, and construction progress.

M12961 · Nova Scotia Power Inc. - CI C0061550 – L5031 Replacements and Upgrades – Hubbards to East Chester - $6,957,058 (ATO)

AI summary

Nova Scotia Power confirmed that the Power Infrastructure L5031 line rebuild (originally initiated from 2017 inspection findings) is in progress, with 24 of 71 new structures installed and approximately 8.73 km of new conductor strung out of an 11 km Phase 2 scope (IR-4).
A January 2025 transformer failure in Glace Bay triggered recall of the mobile substation from the L5031 project site; NS Power owns only three 25 MVA mobile units and requires one always available for emergencies, leaving none available for L5031 (IR-5).
Three bypass structures costing approximately $489,351 in total (installation: $273,446; 87W and Robinsons Corner bypass: $292,135; L-5037 tap bypass: $197,216) were constructed as an alternative to the mobile substation; two bypass structures will remain as permanent assets to support future mobile transformer deployments (IR-5, IR-6).
Material cost variances between the 2024 ACE Plan submission and the 2026 ATO reflect updated pricing and bypass structure additions: wood poles increased from $728,896 to $828,896, insulators from $1,678 to $106,643, and overhead conductor from $271,661 to $371,661 (IR-7); NS Power noted CU rates could not be disclosed publicly and filed IR-7 cost data under a confidentiality request.
Excavation rock-breaking was required at most or all of the 52 completed structure locations due to Chester area geology, with total rock-breaking costs estimated at approximately $254,775; drilling and controlled blasting alternatives were evaluated but deemed infeasible due to lack of equipment, training, and permitting capability in Nova Scotia (IR-9, IR-10).

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What was filed

Documents filed on this day

N-2 NSPI (NSEB) RIRs 1-10 - Redacted exhibits
N-2(C) NSPI (NSEB) RIRs 1-10 - Confidential exhibits
103305 NSPI letter enclosing RIRs and request for confidentiality other_documents