As system hardening focuses on updating overhead lines and equipment, PG&E has to consider over 30,000 line-miles of transmission and distribution assets in High Fire-Threat Districts in its operation. Industry-wide adoption of lighter, stronger, and/or more heat-resistant infrastructure has been limited by cost, availability and longevity.
Wildfire Ignition Prevention Innovation Challenges
As vegetation contact can be a major driver of wildfire ignitions, the California Public Utilities Commission (CPUC) requires specific clearances around power lines. By making current advanced practices of onsite vegetation management more efficient, utilities can reduce risk on the many thousands of line-miles in High Fire-Threat Districts.
PG&E operates over 30,000 line-miles of Transmission & Distribution (T&D) assets in High Fire-Threat Districts (HFTD). Current state-of-the-art technologies to detect faults in real-time and prevent ignition from these faults can reduce risk, but remain expensive, slow to install, and require tuning and maintenance to be effective.
Undergrounding distribution power lines eliminates almost all risk of infrastructure-caused wildfire ignitions; however, the process can be costly, slow, and bounded by physical limitations and irregular terrain. While these constraints have limited the extent of undergrounding in the utility sector, efforts to bring conduit at or below grade could be accelerated if the process could be faster and less costly.