Ontario Electricity Demand by Month for a Year (IESO)

iesopublicreports/demand-by-month

A month-by-month summary of hourly electricity demand on the Ontario grid for one calendar year from the Independent Electricity System Operator (IESO), from 2002 to the current year. Give the year; get one row per month with the number of hours reported, the average and peak Market Demand (includes exports) and the average and peak Ontario Demand in megawatts, and the date and hour of the Ontario peak. The summary is computed by Eden Engine from the IESO's hourly file. A year the IESO has no file for is refused by the source. IESO data subject to the IESO Terms of Use; served by Eden Engine; not an official IESO product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.

Data source

Independent Electricity System Operator (IESO)

Copyright © 2004-2022 Independent Electricity System Operator, all rights reserved. This information is subject to the Terms of Use set out in the IESO's website (www.ieso.ca). Served by Eden Engine; not an official IESO product.

Use it

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "iesopublicreports/demand-by-month" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "iesopublicreports/demand-by-month" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "iesopublicreports/demand-by-month", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "iesopublicreports/demand-by-month", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 25, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "year"
  ],
  "properties": {
    "year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 2002,
      "description": "Calendar year, 2002 to the current year, for example 2025. The current year holds the months so far. A year with no file is refused by the source."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "totalHours",
    "months"
  ],
  "properties": {
    "months": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "month",
          "hours",
          "averageMarketDemandMw",
          "peakMarketDemandMw",
          "averageOntarioDemandMw",
          "peakOntarioDemandMw",
          "peakOntarioDate",
          "peakOntarioHour"
        ],
        "properties": {
          "hours": {
            "type": "integer",
            "description": "Hours reported in the month."
          },
          "month": {
            "type": "string",
            "description": "Month as YYYY-MM."
          },
          "peakOntarioDate": {
            "type": "string",
            "description": "Date of the Ontario Demand peak (YYYY-MM-DD)."
          },
          "peakOntarioHour": {
            "type": "integer",
            "description": "Hour number (1 to 24) of the Ontario Demand peak."
          },
          "peakMarketDemandMw": {
            "type": "number",
            "description": "Highest hourly Market Demand in the month, in megawatts."
          },
          "peakOntarioDemandMw": {
            "type": "number",
            "description": "Highest hourly Ontario Demand in the month, in megawatts."
          },
          "averageMarketDemandMw": {
            "type": "integer",
            "description": "Mean Market Demand over the month's hours, in megawatts, rounded."
          },
          "averageOntarioDemandMw": {
            "type": "integer",
            "description": "Mean Ontario Demand over the month's hours, in megawatts, rounded."
          }
        },
        "additionalProperties": false
      },
      "description": "One entry per month present in the file, in order."
    },
    "totalHours": {
      "type": "integer",
      "description": "Hourly rows the file holds (a gap in the IESO file shows as a missing hour)."
    },
    "reportCreated": {
      "type": "string",
      "description": "When the IESO created the file, as the file states it (YYYY-MM-DD HH:MM:SS)."
    }
  },
  "additionalProperties": false
}