AI-generated summary
· Rir · 05/11/2026
Nova Scotia Power filed responses to 16 NSEB information requests on the $4.39M Big Island subsea cable replacement project, disclosing project scope, cost basis, permitting status, and alternatives analysis.
AI summary
- NS Power confirmed that Big Island is served by a single-phase 2.4kV circuit supplying 80 customers, with no substations on the island, and that the project involves installing a new 28kV AC submarine cable approximately 1,400 m in length between Brownville, NS and Big Island (IR-1, IR-7).
- The 1990s-vintage cable failed during Hurricane Fiona in September 2022 from a phase-to-ground fault; NS Power elected not to repair it and instead re-energized the 1977 cable, which has been serving as the primary supply since and is planned to be retained as a redundant backup after the new cable is installed (IR-4, IR-5, IR-9).
- No standalone technical analysis reports were prepared to evaluate land-based alternatives (overhead or trenched underground along the causeway); the subsea route was selected based on internal engineering judgment and consultation with the NS Department of Public Works confirming causeway vulnerability to storm surge and scour (IR-10).
- The project is at an early stage: no permits have been submitted, no cable supply or installation contracts have been awarded, and critical studies (marine geophysical/geotechnical survey, MetOcean data, benthic habitat, fisheries, and archaeological assessments) have not yet been completed; key procurement milestones are targeted for Q3–Q4 2026 with cable delivery anticipated April–October 2027 (IR-7, IR-12).
- Cost estimates are preliminary and based on analogous projects (including NB Power and Heckman Island procurements) and local contractor pricing; the $849,612 increase from the 2026 ACE Plan reflects the addition of marine geotechnical survey, landfall civil works, and cable protection scope that was not yet defined at ACE Plan preparation (IR-11, IR-16).
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What was filed
Documents filed on this day
- N-2 NSPI (NSEB) RIR 1 to 16 - Redacted
- N-2(C) NSPI (NSEB) RIR 1 to 16 - Confidential
- 101946 Letter NSPI re: RIRs & Request for Confidentiality