Abstract. I consider a mechanism of extraction of rotational energy of a black hole in which strong electric field generated by the black hole rotation leads to production of large amount of high-energy particles in the vicinity of the horizon. Maximal energies of particles are limited by the synchrotron/curvature energy loss. In this synchrotron loss dominated regime the acceleration process is accompanied by strong gamma-ray emission from the acceleration volume. I argue that operation of the high energy particle accelerators in the vicinity of the black hole horizon can power the activity of low-luminosity AGNs, microquasars and gamma-ray bursts.

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