IESO

Live conditions — Ontario grid

The condition is IESO’s own operating state for the Ontario grid — normal, a watch when reserves run thin, or an emergency. It is copied from the operator’s notices, not inferred here; where the operator publishes no feed this page can read, it says so rather than guessing.

Load — IESO demand

Load is total demand served on the IESO system in megawatts. Figures are the values in the export; a dash means the feed did not carry the number, not that it was zero.

as of 2026-09-12 22:35 UTC · source: reports-public.ieso.ca

Fuel mix — Ontario supply mix

• Nuclear8,509 MW · 40.6%
• Gas5,657 MW · 27.0%
• Hydro4,829 MW · 23.1%
• Wind1,405 MW · 6.7%
• Other423 MW · 2.0%
• Solar96 MW · 0.5%
• Biofuel26 MW · 0.1%

as of 2026-09-12 21:00 UTC · hourly · source: reports-public.ieso.ca

Generation by fuel is a single snapshot at its own as-of time, using IESO’s own fuel categories. It moves through the day — solar at midday, gas and storage into the evening.

Prices (LMP) — IESO real-time prices

as of 2026-09-12 22:35 UTC · source: reports-public.ieso.ca

A locational marginal price (LMP) is the cost of serving one more megawatt-hour at a given node: energy, plus congestion, plus losses. The spread between the lowest and highest node is congestion on the IESO transmission system. Negative prices mean surplus supply, usually wind or solar, at that location.

Map — Ontario on the price map

The map colours every IESO pricing node by its latest real-time LMP. The power plant and balancing authority maps linked below show what generates inside the IESO footprint and where its boundary runs.

Alerts & news — IESO notices

Alerts are not available for IESO: no machine-readable IESO alert/advisory feed located; News Releases list is rendered client-side (see grid/iso/sources.md). An empty list here would not mean there are no alerts — check www.ieso.ca directly.

no as-of time · stale · source: www.ieso.ca

FAQ — IESO