Part 107 UAS pilot reported the UAS hit a power line during a pre-programmed flight.

Narrative

At about XA:00 on Day 0; I had controlled flight into a guide-wire at an electrical substation at Location A. This controlled flight was performed through a way-point on the DJI flight application. There was no personal injuries to anyone involved and there was no damage caused to the substation or anything on the ground as a result of the crash. The drone fell straight down after impact to the guide-wire and landed in the stone parking area. There were several workers at the substation. I honked my car horn to get their attention. The substation is surrounded by a tall fence. One worker approached the gate. I explained the situation; indicated where the drone had crashed; asked if he could retrieve the drone for me since I was unauthorized to physically enter the substation. He easily located the drone and returned it to me. Another gentleman took a picture of my car license plate. I presented them with my UAS License and the contract paperwork with contact information from the company that hired me. This company advised me that they have the property authority from the critical infrastructure owner or representative for this inspection. I was hired by Company A to perform a substation inspection consisting of pictures and video. Company A were hired by the operator or otherwise authorized individual to perform this inspection over critical infrastructure. I obtained LAANC authorization for this due to the proximity to ZZZ.What caused this controlled flight into the guide-wire was a miscalculation in altitude in my way-point program. I flew over the guide-wire; recorded the needed altitude to clear the obstruction and programmed this altitude into the way-point program. I initiated the way-point program the drone was flying to the starting point when it collided into the guide-wire. Had I hand flown the drone this accident would not have occurred. This was a way-point altitude miscalculation.I was well rested/ the sky was sunny / the wind was calm. The drone was inspected before the flight for any obvious issues. The drone was flying and performing properly. This was simply a way-point altitude issue.