{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.github.io/wec-energy/json-schema/wec-energy-usage-schema.json",
  "title": "WEC Energy Group Energy Usage Data",
  "description": "JSON Schema for energy usage data records from WEC Energy Group utilities (We Energies, Wisconsin Public Service, Peoples Gas). Aligns with the Green Button / ESPI standard for customer energy usage information.",
  "type": "object",
  "properties": {
    "accountNumber": {
      "type": "string",
      "description": "WEC Energy Group customer account number"
    },
    "utility": {
      "type": "string",
      "enum": ["We Energies", "Wisconsin Public Service", "Peoples Gas", "North Shore Gas", "Minnesota Energy Resources", "Michigan Gas Utilities", "Upper Michigan Energy Resources"],
      "description": "The WEC Energy Group subsidiary utility serving this account"
    },
    "serviceType": {
      "type": "string",
      "enum": ["Electric", "Natural Gas"],
      "description": "Type of energy service"
    },
    "serviceAddress": {
      "type": "object",
      "description": "Service address for this account",
      "properties": {
        "street": {"type": "string"},
        "city": {"type": "string"},
        "state": {
          "type": "string",
          "enum": ["WI", "IL", "MN", "MI"]
        },
        "zip": {"type": "string", "pattern": "^\\d{5}(-\\d{4})?$"}
      }
    },
    "billingPeriodStart": {
      "type": "string",
      "format": "date",
      "description": "Start date of the billing period"
    },
    "billingPeriodEnd": {
      "type": "string",
      "format": "date",
      "description": "End date of the billing period"
    },
    "usageReadings": {
      "type": "array",
      "description": "Array of interval energy usage readings",
      "items": {
        "type": "object",
        "properties": {
          "timestamp": {
            "type": "string",
            "format": "date-time",
            "description": "Timestamp of the usage reading"
          },
          "duration": {
            "type": "integer",
            "description": "Duration of the interval in seconds (e.g., 3600 for hourly)"
          },
          "value": {
            "type": "number",
            "description": "Energy consumption value"
          },
          "unit": {
            "type": "string",
            "enum": ["kWh", "therms", "CCF"],
            "description": "Unit of measurement"
          },
          "quality": {
            "type": "string",
            "enum": ["valid", "estimated", "missing"],
            "description": "Data quality indicator"
          }
        },
        "required": ["timestamp", "value", "unit"]
      }
    },
    "totalUsage": {
      "type": "number",
      "description": "Total energy usage for the billing period"
    },
    "unit": {
      "type": "string",
      "enum": ["kWh", "therms", "CCF"],
      "description": "Unit of measurement for total usage"
    },
    "peakDemand": {
      "type": "number",
      "description": "Peak demand in kW (for electric service, demand rate customers)"
    }
  },
  "required": ["accountNumber", "utility", "serviceType", "billingPeriodStart", "billingPeriodEnd", "totalUsage", "unit"]
}