Calculator in hand, he explained that if you shake three and a half ounces of tempered ice for 12 seconds, you'll generate about 2,000 watts of power on average.

wow that's crazy. a whole 6 watt hours. Come on, this is the energy of two old USB mice plugged in for an hour. Yes, your twelve dollar cocktail requires $0.0004 of energy. Christ the bartender is probably putting out 70 watts to shake it. Do you know how much fucking energy your alcohol needs to manufacture? If the issue is that ice is thrown away, or that freezers are inefficient, then focus on that.

I suspect that eco-friendly bar isn't saving energy by having somebody else make blocks of ice and then ship them. Rather, they are buying clear ice and breaking it up to put fancy ice in their drinks. Using every piece because it is expensive.

Article would be much funnier if it sneered at Americans for drinking drinks that are 70% ice 30% drink. Euros don't need everything to be served at 33°F.