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    "title": "Power Grid Proximity Screener - Transmission Lines Near Sites",
    "description": "Electric substation proximity API: for each site (lat/lon), get distance to the nearest substation, transmission line (kV, owner), and power plant, plus density counts and a HIGH/MEDIUM/LOW grid-access tier. Keyless HIFLD data. For data-center, renewable and BESS siting.",
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            "title": "Assets (sites to screen)",
            "type": "array",
            "description": "Sites to screen for grid access. Each entry is an object { \"lat\": number, \"lon\": number, \"label\": \"optional name\" }. Also accepts \"lat,lon\" strings or [lat, lon] arrays. One dataset row (one billed result) is produced per asset; a bad entry yields an ERROR row and the run continues."
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          "radiusMiles": {
            "title": "Search radius (miles)",
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            "maximum": 50,
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            "description": "Radius around each asset to search for transmission lines, substations and power plants, in miles (1-50). Features beyond this distance are ignored. Default 5.",
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          "minVoltageKv": {
            "title": "Minimum line voltage (kV)",
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            "description": "Optional. Only count/consider transmission lines with voltage at or above this many kV (e.g. 115 or 230). Lines with unknown voltage are excluded when set. Does not filter substations or power plants. Leave empty to include all lines."
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