Liberty-Coolidge 230-kV Transmission System Upgrade - Final Environmental Impact Statement

Aug 26, 2026

Western Area Power Administration proposes to upgrade electrical transmission capability between the Liberty and Coolidge Substations by constructing a new 230-kV, double-circuit transmission line and upgrading the existing Phoenix–Coolidge 115-kV line to 230-kV. The project is prepared in compliance with NEPA and CEQ regulations and is intended to increase capacity, support forecasted power demand, and enhance system reliability and safety. Key impact areas include aesthetic, cultural, land-use, and agricultural resources, with alternatives evaluated including no action and routing variations.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages79

Reading Time3 h 19 min

AccessFree to download

Summary

Introduction

Purpose and Need

Scoping and Project-Related Studies

DOE/EIS-0100-F LIBERTY-COOLIDGE 230-kV TRANSMISSION LINE ARIZONA Final Environmental Impact Statement U.S. Department of Energy 1983 I I I I I I I I I I I I I I I I I I I 1983 Responsible Official: WILLIAM A. VAUGHAN Assistant Secretary Environmental Protection, Safety, and Emergency Preparedness DOE/EIS-0100-F LIBERTY-COOLIDGE 230-kV TRANSMISSION LINE ARIZONA Final Environmental Impact Statement U.S. Department of Energy I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I FINAL ENVIRONMENTAL IMPACT STATEMENT (EIS) LIBERTY-COOLIDGE 230-kV TRANSMISSION SYSTEM UPGRADE DOE/EIS-0 l 00-F Western Area Power Administration For Further Information Contact: Charles Saylor-G lOlO Western Area Power Administration Post Office Box 200 Boulder City, Nevada 89005 (702) 293-884-4- ABSTRACT: Western Area Power Administration (Western) proposes to upgrade electrical transmission capability between the Liberty and Coolidge Substations. The facility will provide additional capacity to help meet forecasted power needs and to enhance system reliability. Alternatives considered were no action, alternative transmission systems, energy conservation, and the proposed action with routing alternatives. Major impacts of the proposed action would be the impacts on aesthetic resources , cultural resources, land use, and agricultural resources. I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I P R E F A C E The Environmental Impact Statement (EIS) prepared for the Liberty-Coolidge Transmission System Upgrade comprises the Draft Environmental Impact Statement (DEIS) (DOE 1983) and this document, Final Environmental Impact Statement (FEIS) . The two volumes are intended to be reviewed together. The DEIS, issued in June 1983, contains a statement of purpose and need, a discussion of the scoping process and project-related studies, a discussion of alternative actions, and an environmental analysis of the affected environment and environmental consequences of the proposed action. The DEIS underwent extensive public review by governmental agencies, organizations, and individuals during an official comment period that included public hearings. This document, the FEIS, contains: o A comprehensive summary of the DEIS and FEIS. 0 A description of the public review process, comments from letters and hearings on the DEIS and Western Area Power Admionistration's responses to comments. 0 Corrections and revisions of data in the DEIS . Copies of the FEIS have been sent to all agencies, organizations, and individuals listed in Chapter 7 of the DEIS, and to all agencies, organizations, and individuals who have since requested copies. I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I SUMMARY INTRODUCTION The Western Area Power Administration (Western ) is proposing to upgrade electrical transmission capability between the Liberty and Coolidge Substations. The project plan is to construct a new 230-kV transmission line (double circuit with the existing Parker-Phoenix 16 1-kV line) from the Liberty station to the Phoenix station, and to upgrade the existing Phoenix-Coolidge 1 1 5-kV transmission line to 230-kV from Phoenix to Coolidge. This Environmental Impact Statement (EIS) was prepared in compliance with the National Environmental Policy Act (NEPA) and the President's Council on Environmental Quality (CEQ) regulations for implementing NEPA . PURPOSE AND NEED The existing Phoenix-Coolidge 1 1 5-kV transmission line is an integral part of the Western system serving southern Arizona. As reported in the 1980 Arizona Loadsand Resource Report, Western has the need to

FAQs

What project does the Final Environmental Impact Statement describe?

The statement covers a transmission system upgrade between the Liberty and Coolidge Substations, including building a new 230-kV double-circuit line and upgrading the Phoenix–Coolidge line to 230-kV.

Why is the upgrade needed?

The existing Phoenix–Coolidge 115-kV line has limited capacity for southern Arizona demand from the Central Arizona Project and customer load growth, so additional transmission capacity is required.

What alternatives and impact areas are considered?

Alternatives include no action, alternative transmission systems, energy conservation, and the proposed action with routing alternatives; major potential impacts involve aesthetic, cultural, land use, and agricultural resources.

Aug 26, 2026

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