A couple of years ago I read about a sustainable dance club in the Netherlands that had installed pressure tiles on the dancefloor to generate electricity from the kinetic energy all the clubbers generated. This in turn greatly reduced the otherwise massive amount of electrical consumption that most dance clubs are notoriously known for. After some stumbling I found the website for the company that develops these dance floors (Sustainable Dance Club).
While dance clubs and their patrons will probably never escape the negative connotations of hedonism that they are unfortunately associated with, it is refreshing to see some thought and innovation go into something other than the art and music. Cities with lots of clubs would be wise to subsidize endeavours like this.