{
  "generated_at": "2026-07-29T19:58:38.439776+00:00",
  "generator": "Project Helios",
  "disclaimer": "Helios infers development activity from public records. Confidence scores are model output, not fact. Helios does not assert the identity of any facility operator unless a direct filing establishes it. Estimates are labelled as such and must not be cited as measurements.",
  "site": {
    "project_code": "AZ-GILBERT-001",
    "jurisdiction": "Gilbert",
    "county": "Maricopa",
    "site_kind": "enterprise_data_center",
    "site_kind_assertion": "reported",
    "current_stage": 7,
    "current_stage_label": "Operational",
    "current_confidence": 35.32,
    "total_acres": 2.8053,
    "first_signal_date": "2026-07-25",
    "latest_signal_date": "2026-07-28",
    "operator_status": "not_established",
    "summary": "1 parcel(s) totalling 2.8 acres near 1040 W MERRILL AVE, Gilbert. Title of record is held by FOX CORPORATION. Helios has not established which organization, if any, operates or will operate a facility here.",
    "boundary": {
      "type": "MultiPolygon",
      "coordinates": [
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  "evidence": [
    {
      "id": "df79f87c-a884-4b99-a3f2-3c91b781dede",
      "evidence_kind": "dedicated_substation_proximity",
      "summary": "Finley Substation tagged 69 kV lies 189 m from the site boundary, close enough for a dedicated connection to be practical. Proximity is a locational precondition, not evidence that this substation serves the site.",
      "snippet": "name = Finley Substation; operator = Salt River Project; max_voltage_kv = 69.0",
      "snippet_locator": "https://www.openstreetmap.org/way/515484742",
      "observed_at": "2026-07-25",
      "assertion_class": "calculated",
      "extraction_method": "geometry_operation",
      "polarity": "supporting",
      "confidence": 0.8932,
      "human_review_status": "not_reviewed",
      "is_standing_condition": true,
      "normalized_values": {
        "match_method": "substation_proximity",
        "operator_name": "Salt River Project",
        "max_voltage_kv": 69.0,
        "distance_meters": 189.49,
        "is_standing_condition": true
      },
      "source": {
        "document_id": "b8abfb58-b6bf-43d9-a88d-3b29d8a9db78",
        "document_version_id": "ad75ee7e-5363-44ab-a65c-26f4f7b68b2f",
        "source_slug": "osm-power-infrastructure",
        "source_name": "OpenStreetMap Power Infrastructure (Overpass API)",
        "agency": "OpenStreetMap contributors",
        "source_url": "https://example.invalid/recorded",
        "retrieved_at": "2026-07-25T21:30:00Z",
        "content_sha256": "b780b9bfc5c677683c8cde030c3a6581404f52cfeebcce02ca795d5d2d86e7b4",
        "parser_version": "0.1.0",
        "attribution_text": "Power infrastructure data (c) OpenStreetMap contributors, ODbL."
      }
    },
    {
      "id": "752ebb88-2a77-4f92-8611-3076948b2f3a",
      "evidence_kind": "assessor_data_center_classification",
      "summary": "Maricopa County Assessor currently classifies this parcel's property use as DATA CENTERS (use code 1507).",
      "snippet": "PropertyUseDescription = DATA CENTERS",
      "snippet_locator": "$.features[9].attributes.PropertyUseDescription",
      "observed_at": "2026-07-28",
      "assertion_class": "reported",
      "extraction_method": "structured_feed",
      "polarity": "supporting",
      "confidence": 0.95,
      "human_review_status": "not_reviewed",
      "is_standing_condition": true,
      "normalized_values": {
        "fields": [
          {
            "name": "land_use_description",
            "value": "DATA CENTERS",
            "locator": "$.features[9].attributes.PropertyUseDescription",
            "raw_text": "DATA CENTERS",
            "raw_unit": null,
            "confidence": 0.95,
            "assertion_class": "reported",
            "normalized_unit": null,
            "extraction_method": "structured_feed"
          }
        ],
        "is_standing_condition": true
      },
      "source": {
        "document_id": "2f6efd07-7c10-4f43-94f2-5b714de87e97",
        "document_version_id": "4f91c5f4-4b77-4df5-b8c8-7edca03375aa",
        "source_slug": "maricopa-assessor-parcels",
        "source_name": "Maricopa County Assessor Parcel Layer",
        "agency": "Maricopa County Assessor / Maricopa County GIS",
        "source_url": "https://example.invalid/recorded",
        "retrieved_at": "2026-07-25T21:30:00Z",
        "content_sha256": "77af6d6d43febde9b56073b5a2200e2713b9331b31345f146047d2723a8a5008",
        "parser_version": "0.1.0",
        "attribution_text": "Parcel data courtesy of Maricopa County Assessor / Maricopa County GIS."
      }
    }
  ],
  "stage_history": [
    {
      "id": "01f22832-49c2-47af-8284-d0ae85c50e3e",
      "from_stage": 0,
      "from_stage_label": null,
      "to_stage": 7,
      "to_stage_label": "Operational",
      "effective_date": "2026-07-28",
      "detected_at": "2026-07-28T17:30:32.236965Z",
      "is_downgrade": false,
      "confidence": 27.14,
      "rationale": "Stage advanced from 0 (No known development) to 7 (Operational) at 27% confidence. Principal evidence: Assessor classifies property use as data centre.",
      "triggering_evidence_ids": [
        "752ebb88-2a77-4f92-8611-3076948b2f3a"
      ],
      "detection_lag_days": 0
    }
  ],
  "predictions": [
    {
      "id": "ba03d412-61ef-4987-bca1-9fa19cb6a113",
      "calculated_at": "2026-07-28T17:30:32.234259Z",
      "as_of_date": "2026-07-28",
      "predicted_stage": 7,
      "predicted_stage_label": "Operational",
      "raw_score": 26.1456,
      "confidence": 35.32,
      "confidence_band": "low",
      "positive_contribution": 26.1456,
      "negative_contribution": 0.0,
      "evidence_considered": 2,
      "distinct_evidence_kinds": 2,
      "is_backtest": false,
      "summary": "35% confidence from 2 evidence records across 2 distinct kinds; stage 7 (Operational).",
      "model_name": "helios-rule-based",
      "model_version": "0.1.0",
      "explanations": [
        {
          "rule_id": "assessor-data-center-classification",
          "evidence_kind": "assessor_data_center_classification",
          "label": "Assessor classifies property use as data centre",
          "detail": "Maricopa County Assessor currently classifies this parcel's property use as DATA CENTERS (use code 1507).",
          "base_weight": 20.0,
          "applied_weight": 19.0,
          "confidence_multiplier": 0.95,
          "recency_multiplier": 1.0,
          "polarity": "supporting",
          "evidence_record_id": "752ebb88-2a77-4f92-8611-3076948b2f3a"
        },
        {
          "rule_id": "dedicated-substation-proximity",
          "evidence_kind": "dedicated_substation_proximity",
          "label": "High-voltage substation in close proximity",
          "detail": "Finley Substation tagged 69 kV lies 189 m from the site boundary, close enough for a dedicated connection to be practical. Proximity is a locational precondition, not evidence that this substation serves the site.",
          "base_weight": 8.0,
          "applied_weight": 7.1456,
          "confidence_multiplier": 0.8932,
          "recency_multiplier": 1.0,
          "polarity": "supporting",
          "evidence_record_id": "df79f87c-a884-4b99-a3f2-3c91b781dede"
        }
      ]
    },
    {
      "id": "b46d7023-b16f-4401-8274-26e1c8bf8d67",
      "calculated_at": "2026-07-28T17:30:32.234325Z",
      "as_of_date": "2026-07-28",
      "predicted_stage": 7,
      "predicted_stage_label": "Operational",
      "raw_score": 19.0,
      "confidence": 27.14,
      "confidence_band": "low",
      "positive_contribution": 19.0,
      "negative_contribution": 0.0,
      "evidence_considered": 2,
      "distinct_evidence_kinds": 1,
      "is_backtest": false,
      "summary": "27% confidence from 2 evidence records across 1 distinct kinds; stage 7 (Operational).",
      "model_name": "helios-rule-based",
      "model_version": "0.1.0",
      "explanations": [
        {
          "rule_id": "assessor-data-center-classification",
          "evidence_kind": "assessor_data_center_classification",
          "label": "Assessor classifies property use as data centre",
          "detail": "Maricopa County Assessor currently classifies this parcel's property use as DATA CENTERS (use code 1507).",
          "base_weight": 20.0,
          "applied_weight": 19.0,
          "confidence_multiplier": 0.95,
          "recency_multiplier": 1.0,
          "polarity": "supporting",
          "evidence_record_id": "752ebb88-2a77-4f92-8611-3076948b2f3a"
        },
        {
          "rule_id": "dedicated-substation-proximity",
          "evidence_kind": "dedicated_substation_proximity",
          "label": "High-voltage substation in close proximity",
          "detail": "Finley Substation tagged 69 kV lies 189 m from the site boundary, close enough for a dedicated connection to be practical. Proximity is a locational precondition, not evidence that this substation serves the site.",
          "base_weight": 0.0,
          "applied_weight": 0.0,
          "confidence_multiplier": 0.8932,
          "recency_multiplier": 1.0,
          "polarity": "supporting",
          "evidence_record_id": "df79f87c-a884-4b99-a3f2-3c91b781dede"
        }
      ]
    }
  ],
  "scoring_model": {
    "name": "helios-rule-based",
    "version": "0.1.0",
    "parameters_hash": "46888dc8be8c1d3ffb00092482a839e09fbddfae9688db732ffd6cf982064079",
    "parameters": {
      "rules": [
        {
          "rule_id": "transmission-or-substation-filing",
          "evidence_kind": "substation_application",
          "identity_weight": 25.0,
          "stage_weight": 25.0,
          "implies_stage": 3,
          "max_occurrences": 3,
          "occurrence_decay": 0.5
        },
        {
          "rule_id": "transmission-filing",
          "evidence_kind": "transmission_filing",
          "identity_weight": 25.0,
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          "max_occurrences": 3,
          "occurrence_decay": 0.5
        },
        {
          "rule_id": "planning-application-data-center",
          "evidence_kind": "planning_application_data_center",
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        {
          "rule_id": "large-industrial-parcel-acquisition",
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        {
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      "staleness_threshold_days": 900,
      "recency_half_life_days": 730,
      "diversity_caps": {
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        "2": 70.0,
        "3": 88.0
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      "saturation_scale": 60.0
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  },
  "attributions": [
    "Parcel data courtesy of Maricopa County Assessor / Maricopa County GIS.",
    "Power infrastructure data (c) OpenStreetMap contributors, ODbL."
  ]
}