Line-crawling robots build durable insulation on the existing conductor while the line stays energized.
A line crew lifts the robots onto the energized conductor.
The robots crawl the span, building weatherproof insulation on the conductor as they go.
The robots are moved to the next span.
It stays in service: nothing is cut, pulled or replaced.
Built directly on the wire in place: thin and light, weatherproof and durable.
A much thicker, heavier factory jacket that comes on new wire, so installing it means replacing the wire.
“We are mindful that our customers rely on us to steward our resources efficiently. Witching Hour's technology could allow us to harden the grid faster and cheaper, and we consider that a win for the entire community.”
Paul Marconi
President, Bear Valley Electric Service
Lab

Testing at Florida State University's Center for Advanced Power Systems
National lab

Research agreement with Oak Ridge National Laboratory, funded by the U.S. Department of Energy
Live line

Live-line contact testing at Knoxville Utilities Board
In the field

Multiple wire-miles deployed on live customer circuits with Bear Valley Electric Service