Download IESO's real-time and day-ahead Ontario energy LMP and demand reports from its public reports server
domain: ieso.ca · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Recognize there's no queryable REST API — reports-public.ieso.ca/public/ is a plain, unauthenticated directory listing of dated report files.
Pull real-time 5-minute LMP from the RealtimeEnergyLMP folder, predispatch hourly LMP from PredispHourlyEnergyLMP, and day-ahead hourly LMP from DAHourlyEnergyLMP.
Pull hourly demand from the Demand folder and zonal demand from DemandZonal/RealtimeDemandZonal.
Construct file URLs using each report's date-based naming convention, since there's no query parameter interface.
Parse the XML/CSV files yourself; there's no server-side pagination or filtering.
Known gotchas
Ontario's 2025 market renewal split some report folders into legacy and successor versions with different naming — check each folder's last-modified date to confirm you're pulling the actively updated one.
The marketing page at ieso.ca/power-data is separate from the actual data host at reports-public.ieso.ca — don't confuse the two.
File-naming conventions differ per report type, so no single URL pattern covers every report.
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