High Humidity Sparks December Blackout in San Francisco
• An independent investigation has revealed that high humidity levels inside PG&E's Mission substation were a key factor in a December blackout that left 120,000 San Francisco residents without power.
• The probe, conducted by engineering firm Exponent, found that condensation buildup caused by elevated humidity led to a fire in the substation's switchgear room.
• The substation, built in the 1940s, lacked proper drainage and ventilation systems, exacerbating the issue.
Why It's Important?
The blackout caused widespread disruption, highlighting vulnerabilities in aging infrastructure. Businesses faced financial losses due to spoiled inventory, while residents endured days without electricity during a critical holiday period. The incident underscores the risks posed by inadequate maintenance and extreme weather conditions, particularly in urban areas reliant on aging utility systems.
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