Tree Line USA is an Arbor Day Foundation program that recognizes best practices in public and private utility arboriculture, demonstrating how trees and utilities can co-exist for the benefit of communities and citizens. Participating utilities adhere to five core standards: quality tree care, annual worker training, tree planting and public education, tree-based energy conservation program, and Arbor Day celebration. Read more about the program here.

Five utilities in Texas are recognized by the program:
- Austin Energy
- Brownsville Public Utilities Board
- CenterPoint Energy
- Garland Power & Light
- Oncor Electric Delivery
The map shows the combined service areas of these five utilities, using service territories from the Department of Homeland Security.