Founded by Alphonse Constant Reyrolle in 1886. In 1901 he moved the business from London to Hebburn on Tyneside from where the company manufactured switchgear for power stations. In 1968 the company merged with C. A. Parsons to form Reyrolle Parsons after further acquisitions and mergers it is now part of Siemens and part of the original site at Hebburn is still used by the company.