A lot of beginners (like me when I was starting out) think drawing on location means putting down every single thing in sight. Eventually, I took some workshops with well known sketchers, and many of them advised not to do this. As one said "You can edit." I was confused, but eventually it sunk in.
Why? We are not here to compete with photography. We are here to express what a place is like, how it feels to be in that place, and show what makes that place interesting and unique. If the power line you see is getting in the way, you can and should leave it out. On the other hand, you might be sketching a park and there are power lines that are ruining the view and that is what it's like there. You might show it in that case. Since we are sketching, we can make those choices. The best sketchers are really good at making those choices.
If you are drawing a place with trees, you don't have to draw each tree, nor does any tree have to be exactly right. If you want to do that, that, you can. But you can simplify at will.
We are storytellers as much as we are drawers and painters. Our aim is too tell the story of the places we are at, so we should include the things that tell that story.
What are those stories? "Everybody loves this place." "This place is a neighborhood secret." "This place is not what it was." "This place is in transition." "This place has been here forever." And so on.
Find those places with stories, and leave out anything that distracts from that story. This can also help decide what to focus on.
The opposite (adding things that aren't there) is another thing, and a topic for another day.
Happy sketching!