“Three of Duke’s power plants — Dan River, Mayo and Roxboro — had to cut its operations in half because instrumentation lines froze, causing Duke to lose 1,300 megawatts of power.”
I thought this only happened in Texas?
“because instrumentation lines froze”
That might be true but if they’re electrical lines, how do they freeze?
Could there be instrumentation lines that contain a freezable liquid? Do they mean an overhead line that collected ice and broke?