  Recent advances in general relativistic magnetohydrodynamic modeling of jets
offer unprecedented insights into the inner workings of accreting black holes
that power the jets in active galactic nuclei (AGN) and other accretion
systems. I will present the results of recent studies that determine
spin-dependence of jet power and discuss the implications for the AGN radio
loud/quiet dichotomy and recent observations of high jet power in a number of
AGN.
