Massive Power Outage in Tuolumne & Calaveras Counties: What Really Caused the Explosion? (2026)

Unraveling the Mystery: New Insights into the Tuolumne and Calaveras Counties Power Outage

The recent power outage affecting nearly 30,000 PG&E customers in Tuolumne and Calaveras Counties has sparked curiosity and raised questions. Initially, reports suggested a lithium-ion battery explosion at the Pacific Ultrapower biomass energy plant in Chinese Camp. However, a surprising revelation has emerged.

According to CAL Fire Battalion Chief Jeff Cox, the real culprit was not the plant itself but a transformer belonging to Engie, an energy transition firm. This transformer, located outside the plant, experienced a surge that impacted PG&E equipment, ultimately causing the widespread outage. Engie's mission to expedite the transition to a carbon-neutral economy adds an interesting layer to the story.

Chief Cox clarified that there was no fire at the plant and no injuries to workers, who were all accounted for. PG&E confirmed the explosion's role in the outage and assured that their equipment suffered no substantial damage. The plant remains shut down, and the reopening timeline is uncertain, as the cause of the transformer's explosion is still under investigation.

This incident highlights the intricate relationship between different energy infrastructure components and the potential ripple effects of a single event. As the investigation continues, residents and businesses in the affected areas await updates and hope for a swift resolution to the power outage.

Massive Power Outage in Tuolumne & Calaveras Counties: What Really Caused the Explosion? (2026)

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