The power output of high level radioactive waste is of the order some watt per kg, comparable to animal metabolism. This is so little that the energy that could

The power output of high level radioactive waste is of the order some watt per kg, comparable to animal metabolism. This is so little that the energy that could be extracted would be worth far less than the running costs for maintenance and security. However, there is the possibility of using breeder reactors to recycle fuel.