In this work, we briefly describe the accelerator breeder reactors (ABR) and their possible uses both for production of energy and isotopes. This study indicates that ABRs can produce fuel, which would generate 2-15 times the electrical energy, ABRs consume. The energy gain depends on the type of ABR used. ABRs should also have several important advantages in safety over the modern breeder reactors. First, they have criticality less then 1 which makes an accident less likely. Second, they can be turned off any moment when their accelerator is turned off.