Explosion at Biomass Plant Causes Massive Power Outage in Tuolumne and Calaveras Counties (2026)

New Details Unveiled: Power Outage Mystery in Tuolumne and Calaveras Counties

The recent power outage affecting nearly 30,000 PG&E customers in Tuolumne and Calaveras Counties has sparked new revelations. Initially, the Tuolumne County Fire Department (TCFD) reported a lithium-ion battery explosion at the Pacific Ultrapower biomass energy plant in Chinese Camp. However, a surprising twist 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, leading to the widespread outage. Engie's mission to expedite the transition to a carbon-neutral economy took an unexpected turn.

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

This incident highlights the complex interplay between energy infrastructure and power distribution. As the investigation continues, residents and businesses in the affected areas await the restoration of power and a clearer understanding of what transpired.

Explosion at Biomass Plant Causes Massive Power Outage in Tuolumne and Calaveras Counties (2026)

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