I wish I had access to the statistics, but an electrician ran the numbers for how much energy the average gaming PC uses. Even with heavy use, it was negligible both for the amount we pay for electricity over a year, as well as on the power grid. Things like air conditioning, central heating, municipal lighting, and industrial uses have a far greater impact on energy consumption.Gamers use a tiny, tiny percentage of that. Going after gamers for "using too much energy" is like trying to address a tsunami with a bunch of buckets by hand. It's not practical and it's not the kind of solution that would make any real difference in the end.
So, we don't need to fret about how much energy our computers use concerning the electric grid, climate issues, or yearly costs. The biggest impact is from heat output. I just replaced my Mac mini with a Mac Pro, and it heats up my office like a space heater when working hard.