Trees can cause power outages when branches rub against power lines, break and fall on lines or when trees are blown over on to power lines during storms. When trees are identified for trimming, crews are instructed to prune branches and vegetation back to a minimum of 12 feet from the high voltage power lines to ensure adequate clearance is maintained over the maintenance cycle period. Liberty crews will additionally identify any trees for removal that are dead, diseased or structurally unsound, despite being within the acceptable clearance zone, if they have the potential to fall on power lines.
Customers should never attempt to trim trees in the vicinity of power lines, due to the danger and risk of coming in contact with power lines.
If you wish to request that a tree be trimmed, or you have questions not answered in our FAQs linked below, please complete the on-line form below to submit a Tree Trimming Request.
Liberty Utilities is a California-based utility, regulated by the California Public Utilities Commission (CPUC). Liberty Utilities will obtain a reasonable amount of clearance beyond the minimum requirements to allow for a several years’ worth of growth, potential wind sway and other environmental factors. Distance obtained from the line after a pruning cycle may be more than 20 feet for fast growing species such as poplars or elms along distribution lines.
There are rules and regulations designed to ensure public safety and electric service reliability. Major regulations covering vegetation management include:
Utilities are required to maintain firebreaks around poles located in wild land areas during fire season that have certain equipment with the potential to emit sparks when operating properly.
Utilities are required to maintain clearance between vegetation and high voltage power lines during fire season in wild land areas to prevent wild fires. Also requires removal of dead, diseased or dying trees that could fall into power lines.
Utilities are required to maintain clearance between vegetation and high voltage power lines at all times in all areas for public safety and electric system reliability.