Comment by 149765

There is also perf:

  perf stat -e 'power/energy-pkg/' -I 1000 --interval-count 3 
  #           time             counts   unit events
       1.001064377              11.00 Joules power/energy-pkg/                                                     
       2.002605466              10.98 Joules power/energy-pkg/                                                     
       3.003726824              11.01 Joules power/energy-pkg/