Nova Scotia Power filed an Authorization to Overspend application for the Trenton Unit 5 IP-LP Turbine Refurbishment, seeking $1,680,490 above the approved $1,282,670 budget for a total project cost of $2,963,160.

M12962 · Nova Scotia Power Inc. - CI C0068659 – TRE5 – IP-LP Turbine Refurbishment - $2,963,160 (ATO)

AI summary

NS Power's Nova Scotia Power application (CI C0068659) seeks board approval for an Capital Expenditures overspend of $1,680,490 on the Trenton Unit 5 Intermediate and Low Pressure (IP-LP) turbine refurbishment, bringing the total forecast cost to $2,963,160 against an ACE Plan budget of $1,282,670.
The variance is driven almost entirely by condition-based defects discovered only after disassembly, including unplanned IP spindle grit blasting (~$450K), shroud band retaining rivet repairs (~$450K), #1 bearing babbitt recasting (~$175K), increased scaffolding and insulation (~$200K), and a low-speed balance operation (~$80K); contract costs alone increased by $1,499,051 over the approved amount.
The project was justified on System Reliability and Asset Management grounds: Unit 5 had exceeded its 50,000-hour maintenance interval by 5,000 hours since its last overhaul in 2012, and the 10-Year System Outlook identifies Trenton 5 as required to meet increasing peak load further into the future than previously forecast.
In accordance with a Board directive from the Decarbonization Deferral Account (Cost Deferral, M11220), NS Power notified DDA proceeding participants of this investment on December 9, 2024 and again on July 13, 2026, as the asset is forecast to be included in the DDA.
The Final Cost Date is extended to December 2026 — beyond the normal six-month window — because project financial reconciliation was delayed by a cybersecurity event that disrupted NS Power's systems during the outage period.

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What was filed

Documents filed on this day

N-1 CI C0068659 – TRE5 – IP-LP Turbine Refurbishment - $2,963,160 exhibits