The Society of Professional Engineers and Associates (SPEA) is an independent union representing over 820 engineers, scientists, technicians and technologists who work for Candu Energy Inc. (formerly Atomic Energy of Canada Limited (AECL) Candu division) in Mississauga, Ontario and abroad (excluding AECL Chalk River Laboratories). Formed in 1974, SPEA is one of the oldest professional unions in Canada (certified in 1974).