FREMONT, NE – The U.S. Department of Labor’s Occupational Safety and Health Administration has cited Horizon Biofuels Inc. for willful and serious safety violations after a deadly explosion at the company’s Fremont facility in July 2025.An investigation was initiated on July 29, 2025, following the explosion that caused fatal injuries to a worker. OSHA cited Horizon Biofuels for violations including combustible dust buildup, failure to ensure equipment within the facility was protected from creating an ignition source and lack of fall protection for employees working at heights greater than four feet. The citations carry $147,542 in proposed penalties.The company has 15 business days from receipt of their citations and penalties to comply, request an informal conference with OSHA, or contest the findings before the independent Occupational Safety and Health Review Commission. Penalties and citations may be adjusted throughout the course of the case. Please check the OSHA establishment search page periodically for any changes in the inspection or penalty status.Learn more about OSHA and combustible dust safety standards. Employers can also contact the agency for information about OSHA’s compliance assistance resources and for free help on complying with OSHA standards.