Among the professions listed, the one least likely to be self-employed is a power dispatcher.
Power dispatchers typically work for utility companies or energy management organizations, where they are responsible for managing the distribution of electrical power and ensuring the stability of the grid. This role generally requires specific training, certification, and compliance with regulatory standards, making it less conducive to self-employment compared to the other professions listed.
In contrast, pipe layers, solar panel installers, and wind turbine mechanics may have more opportunities for self-employment or contract work, as these roles can involve independent contracting for construction or installation projects.