Explosive Outage: What Happened in Tuolumne and Calaveras Counties? (2026)

Unraveling the Mystery: What Really Caused the Massive Power Outage in Tuolumne and Calaveras Counties

The recent power outage affecting nearly 30,000 PG&E customers in Tuolumne and Calaveras Counties has sparked curiosity and raised questions. While initial reports suggested a lithium-ion battery explosion at the Pacific Ultrapower biomass energy plant in Chinese Camp, new details paint a different picture.

The Real Culprit: A Transformer Surge

According to CAL Fire Battalion Chief Jeff Cox, the real cause of the outage was a power surge originating from a transformer outside the plant, owned by Engie, an energy transition firm. This transformer, located nearby, belonged to Engie, whose mission is to expedite the transition to a carbon-neutral economy. Cox clarifies, "There was no fire at the plant, and no injuries to workers."

Impact and Uncertainty

The surge impacted PG&E equipment, leading to the outage. PG&E confirmed that their equipment suffered no substantial damage. The plant shut down, and the exact reopening time remains uncertain. Cox explains, "What triggered the transformer’s explosion has yet to be determined."

A Lesson in Complexity

This incident highlights the complexity of energy infrastructure. While the immediate cause was a transformer surge, the underlying factors contributing to the surge require further investigation. This event serves as a reminder of the intricate relationship between different energy systems and the potential ripple effects of disruptions in one area.

What do you think caused the transformer to explode? Share your insights in the comments below!

Explosive Outage: What Happened in Tuolumne and Calaveras Counties? (2026)

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