Massive Power Outage in Tuolumne and Calaveras Counties: What You Need to Know (2026)

Explosion at Pacific Ultrapower Plant Causes Massive Power Outage in Tuolumne and Calaveras Counties

An unexpected incident unfolded in Tuolumne County, California, leaving nearly 30,000 PG&E customers without power. The initial reports of a lithium-ion battery explosion at the Pacific Ultrapower biomass energy plant in Chinese Camp proved to be a misunderstanding. CAL Fire Battalion Chief Jeff Cox clarified the situation, revealing that the real culprit was a transformer belonging to Engie, an energy transition firm, located outside the plant.

The transformer, situated near the plant, experienced a surge in power, which impacted PG&E equipment, leading to the widespread outage. Despite the initial concern, Cox assured the public that there was no fire at the plant and no injuries to workers. The plant's shutdown was a precautionary measure, and PG&E confirmed that their equipment suffered no substantial damage.

The cause of the transformer's explosion remains under investigation, and the plant's reopening timeline is yet to be determined. This incident highlights the complexities of energy infrastructure and the potential for unexpected disruptions in power supply. As the investigation continues, residents and businesses in the affected areas are advised to remain vigilant and follow updates from local authorities and PG&E.

Massive Power Outage in Tuolumne and Calaveras Counties: What You Need to Know (2026)
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