{
  "$schema": "https://ps-wiki.github.io/schema/v1/term.schema.json",
  "id": "ambient-adjusted-ratings",
  "title": "Ambient-Adjusted Ratings",
  "description": "A transmission facility rating.",
  "language": "en",
  "tags": [
    "system-operator",
    "grid-enhancing-technology",
    "transmission"
  ],
  "related": [
    "dynamic-line-ratings"
  ],
  "breaking": false,
  "dates": {
    "created": "2025-03-15",
    "last_modified": "2025-11-02"
  },
  "authors": [
    {
      "name": "Jinning Wang",
      "url": "https://jinningwang.github.io"
    }
  ],
  "content": {
    "sections": [
      {
        "order": 1,
        "id": "definition-by-miso",
        "title": "Definition by MISO",
        "type": "definition",
        "source_keys": [
          "miso2023ferc881"
        ],
        "page": "p10",
        "body_md": "> A transmission facility rating that:\n> (1) applies to a time period of not greater than one hour;\n> (2) reflects an up-to-date forecast of ambient air temperature across the time period to which the rating applies;\n> (3) reflects the absence of solar heating during nighttime periods where the local sunrise/sunset times used to determine daytime and nighttime periods are updated at least monthly, if not more frequently; and\n> (4) is calculated at least each hour, if not more frequently.\n"
      }
    ]
  }
}