I haven't taken a sharp pencil to this but a digital console should consume less energy than an analog console (with similar functionality).
I don't know .... which burns more power, a 5+ Watt DSP or the 4 dozen op-amps it replaces? Besides, isn't the biggest power draw in a console (whether analog or digital) all the little LEDs? And then there's the flat panel displays.
We shouldn't waste electricity or oil, just like we shouldn't waste water ....
I can appreciate the idea of water conservation in other parts of the country, but here in Michigan it's just not an issue.