McMullen Valley Transmission Line Project, DOE/EA-2292

Project Description

WAPA must consider and respond to EAGL, LLC’s (EAGL) applications to interconnect its proposed facility to the existing Harcuvar Substation. Harcuvar Substation is part of the Central Arizona Power System and is owned by Bureau of Reclamation and operated and maintained by WAPA. The interconnection agreement’s purpose is to ensure that the request will not degrade existing transmission reliability and service. WAPA must respond to EAGL’s interconnection request pursuant to its obligations under its Open Access Transmission Tariff and applicable provisions of the Federal Power Act. BLM is the lead federal agency, WAPA and Bureau of Reclamation are cooperating agencies.

To accommodate the interconnection, WAPA would do the following:

  • Expand the existing Harcuvar Substation to accommodate the Project interconnection and convert the existing configuration from a tap arrangement to a three-breaker ring configuration. The final configuration and location of facilities within the substation expansion area would be determined during final design;
  • Install minor upgrades within the existing footprint of the Parker Substation including metering current transformer (CT) and jumpers;
  • Install minor upgrades within the existing footprint of the Davis Substation including protection system equipment; and
  • Install minor upgrades within the existing footprint of the and Blythe Substation including breaker bushing CTs

EAGL plans to build, operate, and maintain a new double-circuit, 230-kilovolt (kV) transmission line approximately 5.1 miles in length within a 150-foot-wide corridor. The transmission line would extend from a planned substation on state land to the existing Harcuvar Substation predominantly within BLM-designated utility corridors, including Section 368 Corridor 46-269, the Parker-Liberty, and EPNG corridors; limited segments and facilities are located outside the designated corridors. EAGL submitted an application and Plan of Development to the BLM to acquire a Long-Term and Short-Term right-of-way for the McMullen Valley Transmission Line Project (Project; AZAZ106761623).

Project Location

The project is proposed on land administered by the BLM’s Colorado River District Lake Havasu Field Office and situated approximately 3 miles north of the unincorporated community of Wenden and 100 miles west of Phoenix in La Paz County, Arizona. The point of interconnection to WAPA’s transmission system is the existing Harcuvar Substation, located on lands administered by the BLM. Bureau of Reclamation owns the right-of-way for the existing substation, which is operated and maintained by WAPA.

Current Status

BLM is the lead federal agency in the National Environmental Policy Act (NEPA) process and prepared an Environmental Assessment. WAPA and Bureau of Reclamation were Cooperating Agencies. BLM and WAPA each issued their own NEPA decision documents which can be accessed under Project Documents below.

Project Documents

Contact Information:

For questions on the environmental review process please contact:
Abigail Wilmington, Environmental Project Manager
Civil Design & Engineering Inc. (CD&E) on contract to
Western Area Power Administration, Desert Southwest Region
Phone: (480) 790-3282
Email:  Wilmington@wapa.gov

Last modified on November 9th, 2026