Transmission Wire

Connects generators to storage facilities. Might seem risky, but doesn't obstruct passage.
Overview
Transmission Wire is a building used in power-routing layouts. When planning around it, a one-tile break is not a problem for vertical movement if the gap is bridged with a 

This makes Transmission Wire convenient to run through areas where you want to preserve a climb path. A common layout is to leave a one-tile gap in the middle of the wire route and place a Ladder or Wooden Ladder there, allowing the wiring to continue around or through the opening without fully blocking access.
Official description
Connects generators to storage facilities. Might seem risky, but doesn't obstruct passage.