As you can see in the picture, the telescope is in use, but doesn't consume the expected 120W (even if it's just about the door opening and closing) - there is no other machinery currently in use in the circuit, so it's at 0W of 24880W.
P.S. The telescope has a reduced visibility of 91% at the moment, maybe it's related to that.
Steps to Reproduce
1. Build functioning telescope (Visibility in my game: 91%) 2. Let dupe work in telescope 3. Look at power consumption
This issue has not been confirmed by a developer yet.