LED lights run up each of the three legs of the tower. When they are green, the city is running at better than it’s daily goal for energy consumption, when the lights are red the city has exceeded it’s limits by some amount.
If the tower turns red on a particular day will people scramble to turn down their a/c or lighting? What if there were some kind of collective consequence? Once the city is more populated, the answers will start to become clearer, but for now, the grand experiment awaits