By what mechanism do they set power lines on fire in a way that it wouldn't set the lines in my house on fire? Is it the power lines themselves or is it just vi

By what mechanism do they set power lines on fire in a way that it wouldn't set the lines in my house on fire? Is it the power lines themselves or is it just vicious currents being induced in the lines that cause devices plugged on the other end of the power lines to go up in smoke? If the grid just shut off power for 24 hours until the CME passed would that solve the problem? I can easily go 24 hours without power, but not months.