Wildfire evidence study · California, United States · 2019
An archived “under investigation” label is not necessarily the latest finding. Kincade’s incident page retains that label, but later regulatory documentation records CAL FIRE’s determination that electrical transmission lines caused the fire. The dates of the sources resolve this apparent contradiction.
Documentary review · Sources checked 30 October 2026 · Historical case, not live incident information.
The published event record
| Field | Recorded value |
|---|---|
| Start | 23 October 2019 |
| Later milestone | 6 November 2019 |
| Reported acres | 77,758 |
CAL FIRE’s incident page records 77,758 acres in Sonoma County, 374 structures destroyed and 60 damaged. Its last-updated field is March 2020. The later CPUC materials describe CAL FIRE’s July 2020 cause finding and a failed jumper on the Geysers line. The regulatory document attributes the mechanical explanation to CAL FIRE; this article does not present an independent examination of the equipment. See primary records below.
A cause timeline needs more than the incident start date
The fire date, the investigation publication date and the webpage’s update date answer different questions. A database that stores only one date can accidentally treat an earlier operational status as a later technical conclusion. Kincade needs both the October 2019 event and the July 2020 finding in its evidence timeline.
The analytical distinction is between ignition and subsequent spread. Evidence identifying electrical equipment as the ignition source does not quantify how much of the final footprint resulted from each weather, terrain or fuel condition. A complete reconstruction would need time-resolved fire progression and weather observations in addition to the equipment investigation.
Regulatory settlement materials also have a defined scope. They document allegations, stipulated facts and negotiated terms; they should not be relabeled as a universal judicial determination of every issue. Here they are used narrowly to establish that a later cause finding exists and to describe how it is attributed.
For a researcher updating an older case table, the defensible change is to replace the stale cause summary while preserving the earlier status in the chronology. Erasing the old record loses the history of what was known when; treating both statuses as simultaneous findings creates false uncertainty.
What this study does and does not establish
No failure probabilities, equipment-life estimates or legal conclusions are calculated here. The incident page and regulatory document are retained as distinct source types.
This is a documentary evidence review, not fieldwork or an independent forensic investigation. Published numbers retain their source definitions. Differences are identified rather than silently reconciled. The analysis above is Tecnobosque’s interpretation of the cited record.
Primary records and source notes
- Kincade Fire: official incident or annual record — chronology, scope and reported figures discussed above.
- CPUC administrative consent-order and settlement materials — used only for the findings explicitly attributed in this study.
Continue the investigation
Tubbs Fire: cause findings and the evidence timeline · Read our evidence-review method · Browse United States cases · Browse the full fire archive
Cite this record
Tecnobosque. “Kincade Fire 2019: Transmission-Line Evidence and an Outdated Cause Field.” Documentary evidence review, 30 October 2026. https://tecnobosque.com/kincade-fire-2019/. Cite the underlying primary source when reusing its figures.