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We discuss the impact of a hidden sector consisting of Minicharged Particles(MCPs) and massless hidden photons on the expansion history of our Universe. Wepresent parameter scans for the amount of extra relativistic particles (Neff)and the abundance of light nuclei for fermionic MCPs with masses between ~100keV and 10 GeV and minicharges in the range 10^(-11)-1. Current CMB and BBNdata significantly constrain the available parameter space of MCPs. The shownresults are a valuable indicator for future experimental searches and arepresented in a flexible way so that more accurate results on Neff can be easilyinterpreted.

Dark Radiation from a hidden U(1)