AI-generated summary
· Rir · 07/14/2026
Nova Scotia Power filed responses to four Board information requests on the $2.43M Canso Crossing vibration mitigation capital project, addressing cost breakdowns, engineering report status, work phasing, and original design rationale.
AI summary
- IR-1 (Cost Breakdown): NSPI confirmed that the $1,670,755 line item for installation of the new vibration mitigation system covered contractor work by Locke's Electrical Limited to install 288 custom PLP dampers and 1,164 PLP airflow spoilers using a third-party helicopter company on a time-and-materials basis; a partially confidential contractor invoice (Attachment 1) provides full unit, hour, and rate details.
- IR-2 (Engineering Report): NSPI clarified that the Havard Engineering report filed as Attachment 1 (pp. 15–88), although bearing a draft watermark, was confirmed by its author to be the final version; no further version was prepared.
- IR-3 (Recommended Actions): NSPI described a phased multi-year program aligned with the Havard Engineering report's Section 7–10 recommendations, spanning 2022 (immediate inspections, armor rod and damper installations), 2023 (drone inspections, long-term mitigation selection, external expert engagement), and 2024 (final pre-work inspections, tower checks, procurement, laboratory validation, and monitoring framework).
- IR-4 (Design Rationale): NSPI acknowledged awareness of the 1984 galloping issues on adjacent L8004, but explained that aeolian vibration (the primary L7005 concern) and galloping are distinct phenomena; it stated that precautionary inclusion of airflow spoilers in the original L7005 design would have required taller towers and larger foundations due to an estimated 6.67 m of additional conductor sag, significantly increasing project costs, and that a September 2023 Transport Canada reduction in minimum vertical clearance requirements ultimately enabled the retrofit solution to proceed without those structural upgrades.
- Confidentiality: NSPI's July 14, 2026 cover letter confirms IR-1 confidentiality treatment is consistent with the original application filing; the confidential version of the IR responses (Document 320036) remains access-restricted.
Disclaimer: This summary was generated by AI from the filings it describes. We take care to make it accurate, but errors are possible - and it isn't advice. Only the filings themselves are the record: if you're relying on something here, confirm it against the source documents or the Nova Scotia Energy Board's own record. Full disclaimer →
What was filed
Documents filed on this day
- N-3 NSPI (NSEB) RIR 1 to 4 - Redacted
- N-3(C) NSPI (NSEB) RIR 1 to 4 - Confidential
- 102749 Letter NSPI re: RIRs & Justification for partially confidential material