SCH Number 2025070053

Project Info

Title

Adelanto-Rinaldi Line 1 Upgrade Project

Description

The Los Angeles Department of Water and Power (LADWP) is proposing the Adelanto-Rinaldi Line 1 Upgrade Project (proposed project), which involves ampacity upgrades of the Adelanto – Rinaldi Line 1 (ADL-RIN L1) transmission line to increase its capacity from its current rating of 500 kV at 1593A/1593A (continuous/emergency) to approximately 500 kV at 1680A/1965A. The ampacity upgrade requires ground clearance grading and tower raises in order to be compliant with transmission line safety and reliability standards. The location of the proposed project is along one existing 500 kilovolt (kV) overhead transmission line (ADL-RIN L1) located in the northern portion of Los Angeles County. The proposed project would be required to comply with the California Public Utilities Commission’s (CPUC) General Order 95 (GO 95) Clearance Code Requirements as mandated by the North American Electric Reliability Corporation (NERC). The specific clearance requirements set by General Order 95 (GO 95) are included in Appendix A. Achieving this height consistency is necessary to ensure the distance between the transmission line conductors and the ground or road surface below is sufficient to meet code requirements guiding the safe and reliable operation of transmission lines. LADWP proposes to comply with the code clearances by grading the ground surface of the area underneath the transmission lines at nine work areas to achieve height consistency per NERC requirements. Additionally, LADWP has identified eight locations where towers would be raised by approximately 10 to 20 feet in order to achieve height consistency. The total acreage of grading would be approximately 3.74 acres, and the total acreage of tower raising activities would be an additional 1.44 acres. The project, as proposed, would also involve improvements to portions of existing access roads to be used for site access, equipment staging and storage, and distribution of excavated soils. Construction would occur sequentially along the transmission line corridor and is anticipated to take up to 2.5 years. Once construction is complete, operation activities would be minimal and limited to routine operations and maintenance inspections as are currently carried out on the existing line.

2 documents in project