Question about the energy achievements

I know the achievements for suppying power with Green , Coal/Oil and Nuclear energy need x amount of RZs to be supplied with said type of power. But how does the game count buildings with more power consumption, like Paris or Omega zones, or the regional RZs? Does every RZ count as 1 for the achievements, or do higher demand houses count more (the amount of ⚡ power the RZ consumes)?