A NECA associate member since 1987. OneSource Distributors serves the commercial, residential, utility, contractor, and industrial markets in Southern California, Baja Mexico, Yuma-Arizona and Hawaii. OneSource Distributors joined Sonepar USA in 2011. Sonepar USA is made up of 16 of the finest locally managed electrical and industrial distributors, with coverage in all 50 states. Sonepar USA is member of the Sonepar Group, an independent family-owned company with global market leadership in B-to-B distribution of electrical products and related services.