Founded in 1976, The SEFA Group is a Lexington, South Carolina-based company that specializes in recycling fly ash for the construction industry. With over 40 years of experience, the company has recycled more than 20 million tons of fly ash, preventing its disposal in landfills or ponds. SEFA's proprietary thermal beneficiation process, STAR Technology, is the first of its kind and has enabled the commercial-scale processing of coal ash from ponds. The company offers fly ash, industrial solutions, and other services to utility, construction, and transportation industries. In April 2023, The SEFA Group was acquired by Heidelberg Materials, although the terms of the transaction were not disclosed.