Would They Use Some of That Energy to Send Out a Signal From Outer Space?

Our use of energy makes us visible from other planets but not from very far away because those messages are not broadcast in like a tight beam they're sort of generally diffused. You'd have to be pretty close to earth or have very very sensitive antennas to even pick up our messages. And I guess you're also imagining or Kardashev was imagining the scenario where you're broadcasting blindly in all possible directions and your hope that somebody listens to it how much energy would you need for that? If you wanted more focus communication then you wouldn't need that right.