  The UV continuum spectrum of quasars and AGN is assumed to originate from an
accreting disk surrounding a massive rotating black hole. We discuss the
structure and emission spectra of a disk which drives a powerful jet. Due to
the large efficiency of extracting energy from the accreting matter in the
inner part of the disk close to the massive object, all the energetic
conditions for the formation of jets are fulfilled. The total energy going up
into the jet depends strongly on the Kerr black hole parameters, on the disk
features and on the mass flow and thickness of the jet. The shape of UV spectra
of the AGN can be explained by a sub-Eddington accretion disk which drives a
jet in the innermost parts.
