Just weeks after a York County Circuit Court dismissed a zoning challenge against its facility, Silfab Solar’s $150 million Fort Mill manufacturing plant has been ordered to cease all manufacturing operations.
The South Carolina Department of Environmental Services (SCDES), in coordination with the U.S. Environmental Protection Agency (EPA), has launched a comprehensive investigation following two chemical releases reported within a single week.
The first incident occurred on March 3, involving a release of approximately 300 gallons of potassium hydroxide. According to SCDES, the solution reached an onsite stormwater retention pond before being contained. This was followed on March 5 by a reported “drip” of hydrofluoric acid, a highly corrosive agent used in the etching of solar cells.
While Silfab officials characterized the second leak as minor, the proximity of the plant to Flint Hill Elementary School prompted a two-day closure of the campus out of an “abundance of caution.”
The regulatory response has been swift. SCDES has issued a “total stop” directive, mandating that Silfab remain offline until a root-cause analysis is completed and a third-party engineer certifies the safety of all chemical systems.
S.C. Attorney General Alan Wilson also weighed in, issuing a public safety advisory and demanding a full accounting of safety protocols by the end of the week.
The incidents have reignited local political friction that has followed the project since its inception. State Senator Michael Johnson (R-York) has called for the York County Council to rescind the facility’s operating licenses, citing concerns over the handling of hazardous materials in a “Light Industrial” zone.
Silfab, which has expanded its U.S. footprint to leverage Inflation Reduction Act incentives, maintains that its redundant safety systems performed as designed.
Director of Operations Greg Basden labeled the school closures an “overreaction” and expressed confidence that the plant will resume assembly shortly. For now, however, the 1 GW facility remains dormant as federal and state investigators audit its Risk Management Plan.
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