Ameren Illinois uses several private contractors to perform its line clearance tree trimming. Our contractors are nationally recognized as professional arboricultural companies who meet American National Standards Institute (ANSI) pruning standards and pruning methods endorsed by the International Society of Arborists (ISA). All crew foremen are certified line clearance tree trimmers, and all general foremen are arborists certified by the International Society of Arboriculture. All tree-trimming contractors working for Ameren Illinois have a valid company identification badge.
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