The answer used to be &quot;aluminum smelters&quot; (aluminum, aka &quot;frozen electricity&quot;).<p>Interestingly, the aluminum smelters in the mountains behind Portland closed down when the datacenters moved in and bought all the cheap hydro electricity they used to use.<p>My guess is that a tax increase on electricity will hit the Google&#x2F;Facebook&#x2F;Amazon&#x2F;Apple&#x2F;Microsoft and other &quot;cloud businesses&quot; pretty hard...