{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/energy-utilities/refs/heads/main/json-schema/energy-utilities-energy-data-point-schema.json",
  "title": "EnergyDataPoint",
  "description": "A generalized energy data point — the single shape used to carry any quantitative observation in the energy and utilities domain. Covers retail meter intervals, wholesale-market LMP prints, EIA time-series observations, NREL solar irradiance samples, weather-driven load drivers, EV-charging session telemetry, and DERMS device telemetry. Where a MeterReading captures a specific physical meter's measurement, an EnergyDataPoint is the broader observation envelope used across providers.",
  "type": "object",
  "required": [
    "series",
    "timestamp",
    "value",
    "unit"
  ],
  "properties": {
    "series": {
      "type": "string",
      "description": "Provider-qualified time-series identifier. Examples: 'eia.electricity.rto.region-data.D.NYIS', 'caiso.lmp.SP15.5m', 'utilityapi.intervals.kwh', 'nrel.nsrdb.ghi'."
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "UTC timestamp marking the start of the observation interval (ISO 8601)."
    },
    "intervalSeconds": {
      "type": "integer",
      "minimum": 0,
      "description": "Length of the observation interval in seconds. 0 indicates an instantaneous reading. Common values: 60, 300, 900, 3600, 86400."
    },
    "value": {
      "type": "number",
      "description": "Numeric value of the observation, expressed in the units given by unit."
    },
    "unit": {
      "type": "string",
      "description": "Unit of measure for value. Includes energy, power, price, irradiance, temperature, and volumetric units commonly emitted by APIs in this catalog.",
      "enum": [
        "Wh",
        "kWh",
        "MWh",
        "GWh",
        "W",
        "kW",
        "MW",
        "GW",
        "USD/MWh",
        "USD/kWh",
        "cents/kWh",
        "USD/MMBtu",
        "USD/therm",
        "W/m2",
        "Wh/m2",
        "celsius",
        "fahrenheit",
        "m/s",
        "mph",
        "ccf",
        "therms",
        "MMBtu",
        "m3",
        "gallons",
        "percent",
        "count"
      ]
    },
    "kind": {
      "type": "string",
      "description": "What kind of measurement this is, independent of the unit. Helps consumers route a value through the right model.",
      "enum": [
        "consumption",
        "generation",
        "demand",
        "price",
        "load",
        "forecast",
        "irradiance",
        "wind-speed",
        "temperature",
        "humidity",
        "outage-count",
        "soc",
        "session-energy"
      ]
    },
    "location": {
      "type": "object",
      "description": "Spatial reference for the data point.",
      "properties": {
        "latitude": { "type": "number", "minimum": -90, "maximum": 90 },
        "longitude": { "type": "number", "minimum": -180, "maximum": 180 },
        "marketNode": { "type": "string", "description": "ISO/RTO pricing node, hub, or zone (e.g., CAISO SP15, ERCOT HB_HOUSTON, PJM WESTERN HUB)." },
        "balancingAuthority": { "type": "string", "description": "NERC balancing authority code (e.g., CISO, ERCO, PJM, MISO, ISNE, NYIS, BPAT)." },
        "utility": { "type": "string", "description": "Retail utility name where applicable." },
        "serviceTerritory": { "type": "string", "description": "Utility service territory or DSO operating area." },
        "geohash": { "type": "string", "description": "Optional geohash for spatial bucketing." }
      },
      "additionalProperties": false
    },
    "asset": {
      "type": "object",
      "description": "Physical or logical asset the observation belongs to (meter, charger, inverter, generator, sensor).",
      "properties": {
        "id": { "type": "string" },
        "type": {
          "type": "string",
          "enum": [
            "meter",
            "submeter",
            "inverter",
            "battery",
            "ev-charger",
            "ev-session",
            "generator",
            "load",
            "sensor",
            "weather-station",
            "balancing-authority",
            "market-node"
          ]
        },
        "manufacturer": { "type": "string" },
        "model": { "type": "string" }
      },
      "required": ["type"],
      "additionalProperties": false
    },
    "quality": {
      "type": "string",
      "description": "Data quality marker.",
      "enum": [
        "valid",
        "estimated",
        "missing",
        "questionable",
        "preliminary",
        "final"
      ]
    },
    "source": {
      "type": "object",
      "description": "Provenance of the observation — which API delivered it.",
      "properties": {
        "providerId": { "type": "string", "description": "Provider key from this catalog (e.g., eia, caiso, ercot, pjm, nrel, utilityapi, bayou, arcadia, nws, openweather, openadr, ocpi)." },
        "endpoint": { "type": "string", "description": "Specific endpoint or report identifier the data came from." },
        "retrievedAt": { "type": "string", "format": "date-time" }
      },
      "required": ["providerId"],
      "additionalProperties": false
    },
    "tags": {
      "type": "array",
      "description": "Free-form tags for filtering and rollup.",
      "items": { "type": "string" }
    },
    "metadata": {
      "type": "object",
      "description": "Provider-specific extensions that do not map into the core envelope.",
      "additionalProperties": true
    }
  },
  "additionalProperties": false
}