Nova Scotia Power responds to NSEB information requests on a vendor defect in the Dispatch Study model affecting hydro and Tufts Cove generation dispatch

M12919 · Nova Scotia Power Dispatch Study Action Plan – Quarterly Update – Q2 2026

AI summary

NSPI filed responses to NSEB IR-1 in M12919, disclosing a defect in the vendor-developed Dispatch Study model related to misinterpretation of Daily Max Energy design requirements for Hydro and Tufts Cove generation (IR-1(a)).
The defect caused Daily Max Energy to be implemented as a calendar-day constraint using a rolling 24-hour horizon rather than a static calendar day, resulting in inaccurate dispatch — for example, Wreck Cove's 100 MW limit being repeatedly attributed across intra-day model runs (IR-1(a)).
The defect was undetectable until End-to-End (full integration) testing was completed, as the Project Schedule design specification interpretation issue was not visible to the project team during earlier development stages (IR-1(a)).
Estimated remediation cost is approximately $98,309, with final costs still to be calculated; NSPI states this amount remains within the approved Capital Expenditures project budget and will not result in additional ratepayer costs (IR-1(b), IR-1(c)).

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What was filed

Documents filed on this day

N-2 NSPI (NSEB) RIR 1 exhibits