The Communications, Electrical and Plumbing Union of Australia (CEPU) is a trade union in Australia. Its full name is the Communications, Electrical, Electronic, Energy, Information, Postal, Plumbing and Allied Services Union of Australia as it represents workers in all of these industries. CEPU is an almagation of three separate unions, namely the: Whilst the CEPU is technically one federally registered union, each of the above unions that merged act largely autonomously sharing resources when needed. At a state level many of the unions exist completely separately. CEPU is affiliated with the Australian Council of Trade Unions.