How can I learn more?

Call or write:

John Holt, Environment Manager
Desert Southwest Region
Western Area Power Administration
P.O. Box 6457
Phoenix, AZ 85005
phone: 602-605-2592
fax: 602-605-2414

Mark Wieringa, NEPA Document Manager
Western Area Power Administration
P.O. Box 281213
Lakewood, CO 80228-8213
phone: 720-962-7448
fax: 720-962-7263

For project information in Spanish, call or write:

Ms. Enoe Marcum, Environmental Specialist
Desert Southwest Customer Service Region
Western Area Power Administration
P.O. Box 6457
Phoenix, AZ85005
phone: 602-605-2422
fax: 602-605-2414

For information on the Presidential permit process, call or write:

Mrs. Ellen Russell
Office of Electricity Delivery and Energy Reliability (OE-20)
U.S. Department of Energy
1000 Independence Avenue, SW
Washington, D.C. 20585-0350
phone: 202-586-9624
fax: 202-586-5860


​What is the San Luis Rio Colorado Project?

Generadora del Desierto S.A. de C.V. is proposing to build a new 550-Megawatt nominal (605-MW peaking) natural gas-fired, combined cycle power generating facility to be located approximately 3 miles east of San Luis Rio Colorado, Sonora, Mexico, and about one mile south of the international border.

The applicant wants to sell electricity in both Mexico and the United States and has applied to DOE for a Presidential permit to construct two 500,000-volt electric transmission lines across the United States border from Mexico. North Branch Resources, LLC, a partner in the proposed project, has applied to interconnect with WAPA’s transmission system in the Yuma area.

The applicants are each wholly owned subsidiaries of North Branch Holding, LLC. GDD proposes to construct, own, operate and maintain the power plant in Mexico and the short section of transmission line located in Mexico. The applicants propose that WAPA construct, own, operate and maintain the double-circuited 500-kV transmission components in the United States, at the applicants’ expense. WAPA is favorably considering this proposal.

In response to the interconnection request to WAPA, the transmission line would interconnect with WAPA’s transmission system through a 500/161-kV expansion at Gila Substation, located east of Yuma. Under the proposal, WAPA would construct, own, operate and maintain the 500-kV transmission line between a Point of Change of Ownership near the international border and the Gila Substation, the 500/161- kV expansion at Gila Substation, and the 500-kV transmission line between Gila Substation and Arizona Public Service Company’s North Gila Substation. In that case, WAPA would become a co-applicant on the Presidential permit application.

Although the applicants have proposed a 500-kV project, WAPA is also evaluating a 230-kV double circuit option in the EIS.

Why are DOE and WAPA involved in this project?

Interconnection request

Federal Energy Regulatory Commission Orders No. 888 and 888-A require all public utilities owning or controlling interstate transmission facilities to offer non-discriminatory open access transmission services. Through these Orders, FERC addressed the need to encourage lower electricity rates by facilitating the development of competitive wholesale electric power markets through the prevention of unduly discriminatory practices in providing transmission services.

To be consistent with these orders, WAPA published a Final Open Access Transmission Service Tariff in the Federal Register on Jan. 6, 1998. WAPA filed an amendment to the Tariff with FERC on Jan. 25, 2005, to adopt Large Generator Interconnection rules that substantially conform with those published by FERC. WAPA’s amended Tariff requires WAPA to respond to an application as presented by an applicant. Section 211 of the Federal Power Act requires that transmission services be provided upon application if transmission capacity is available.

In compliance with FERC’s rules, WAPA committed to accommodating new transmission capacity constructed by an applicant. NBR requested an interconnection to the Federal transmission system under WAPA’s Tariff. WAPA must determine whether to grant or deny the interconnection while considering effects of the proposed project on existing customers, the environment, system reliability, and any system modifications needed to accommodate the interconnection. If the interconnection request is granted and the proposed project proceeds, one option is for WAPA to construct, own, operate and maintain any required modifications to its own transmission system within the United States at the expense of NBR. Decisions on WAPA’s role in this project will be made after the environmental impact statement is completed.

Because the proposed project would integrate a major new source of generation into WAPA’s transmission system, WAPA determined that an EIS is required under DOE’s NEPA Implementing Procedures, 10 CFR part 1021, Subpart D, Appendix D, class of action D6.

Presidential Permit request

GDD has applied to DOE for a Presidential permit to construct two 500-kV electric transmission lines across the United States border from Mexico. Executive Order 10485, as amended by Executive Order 12038, requires that a Presidential permit be issued before electric transmission facilities may be constructed, operated, maintained, or connected at the U.S. international border. The Executive Order provides that a Presidential permit may be issued after a finding that the proposed project is consistent with the public interest and after concurrence by the U.S. Departments of State and Defense.

In determining consistency with the public interest, DOE considers the environmental impacts of the proposed project under NEPA, determines the project’s impact on electric reliability (including whether the proposed project would adversely affect the operation of the United States electric power supply system under normal and contingency conditions), and any other factors that DOE may also consider relevant to the public interest. Issuance of a Presidential permit indicates that there is no Federal objection to the project, but does not mandate that the project be completed.

Can I still comment now that the scoping period has ended?

You may provide comments on the proposed project throughout the EIS process. Send your comments to: Mr. John Holt, Environment Manager, Desert Southwest Region, Western Area Power Administration, P.O. Box 6457, Phoenix, AZ 85005, fax: 602-605-2414, e-mail:

What will the EIS address?

In the EIS, DOE will examine public health and safety effects and environmental impacts within the United States from the proposed transmission facilities and from the associated Mexico generating facility. The EIS will be prepared under the requirements of the Council on Environmental Quality’s National Environmental Policy Act Implementing Regulations (40 CFR parts 1500?1508) and DOE’s NEPA Implementing Procedures (10 CFR part 1021).

Because the project involves action in a floodplain, the EIS will include a floodplain assessment and floodplain statement of findings following DOE regulations for compliance with floodplain and wetlands environmental review (10 CFR part 1022). Tribal governments and Federal, state, and local agencies with special expertise or jurisdiction over the proposed project are being invited to become cooperating agencies on the EIS.

Since the EIS would be prepared in compliance with U.S. law, it will only address impacts that would occur in the United States.

NEPA does not require an analysis of environmental impacts that occur within another sovereign nation that result from approved actions by that sovereign nation. Executive Order 12114 (January 4, 1979) requires Federal agencies to prepare an analysis of significant impacts from a Federal action in certain defined circumstances and exempts agencies from preparing analyses in others. The Order does not require Federal agencies to evaluate impacts outside the United States when the foreign nation is participating with the United States or is otherwise involved in the action.

Here, the Mexican Government has been involved in evaluating the environmental impacts associated with the generating facility in Mexico and has issued permits authorizing the construction and operation of the generating facility and ancillary facilities, including water use. An overview of the permitting of the generating facility and associated environmental impacts analysis that was performed by the Mexican government will be included in the Draft EIS.

What project activities are planned outside the United States?

Inside Mexico, GDD plans to construct and operate a new 550-Megawatt (MW) nominal (605-MW peaking) natural gas-fired, combined cycle power generating facility located approximately 3 miles east of San Luis Rio Colorado, Sonora, Mexico, and about one mile south of the international border.

While this facility is not subject to the United States’ regulatory requirements, DOE will evaluate impacts within the United States from its operation as part of its impact analysis. GDD plans to construct the power generating facility to comply with applicable United States environmental standards in addition to those of Mexico’s lnstituto Nacional de Ecolog?a.

The planned generating facility would be equipped with advanced air emissions control technology, including low-NOx combustion technology and a selective catalytic reduction system for oxides of nitrogen, and catalytic oxidizers for carbon monoxide emissions control. The powerplant would also use wet/dry parallel cooling to reduce water consumption.

The generating facility’s primary source of water would be treated effluent from the San Luis Rio Colorado water treatment plant, and GDD would construct a pipeline system connecting the two facilities. A natural gas pipeline approximately 24 miles long would be constructed from the generating facility to an existing main gas line.

GDD plans to sell off-peak power inside Mexico to the association of maquiladoras (fabrication or assembly plants in the North American Free Trade Agreement zone) of San Luis Rio Colorado and also to the Comisi?n Federal de Electricidad, Mexico’s national electric utility. GDD would construct, own, operate and maintain a section of transmission line in Mexico to a point near the international border (Point of Change of Ownership).

What proposed action and alternatives are being considered?

WAPA is evaluating the environmental impacts of a proposed project to interconnect with its transmission system in the Yuma, Ariz., area. WAPA received a request from Generaldoro del Desiertro S.A. de C.V. and North Branch Resources, LLC, who plan to build a power plant just across the international border in Sonora, Mexico that would interconnect with WAPA’s Gila Substation and Arizona Public Service’s North Gila Substation.

WAPA considers the 500-kV transmission facilities south of Gila Substation, the Proposed Point of Interconnection, to be interconnection facilities for the sole use of the applicants, while the path between Gila Substation and North Gila Substation is a network upgrade benefiting the integrated transmission system.

GDD has received an authorization from Comisi?n Reguladora de Energia, Mexico’s energy regulatory commission, to export electric energy to the United States and GDD proposes to deliver on-peak electrical power into the United States, in the vicinity of Yuma.

The total length of the 500-kV transmission system within the United States would be approximately 25 miles; 20 miles from the international border to Gila Substation and five miles from Gila Substation to North Gila Substation. To reduce the height, the double-circuit 500-kV transmission line may be constructed as two separate single-circuit transmission lines for a short distance near the U.S. Marine Corps Auxiliary Airfield No. 2 landing pattern. The project may also be constructed as a double-circuit 230-kV transmission line.

The applicants proposed a route for the 500-kV transmission line that crosses the border immediately north of the proposed power generation facility and then turns northeast to the boundary of the Barry M. Goldwater Range. The route then proceeds north along the boundary of the Range and parallels the proposed Area Service Highway and WAPA’s existing Sonora 69-kV transmission line.

Near the northwest corner of the Range, the proposed route heads north to the Yuma Mesa Irrigation District canal and levee, then turns generally northeastward, paralleling the canal, levee, levee road and WAPA’s 69-kV line into Gila Substation. Leaving Gila Substation, the proposed route parallels the existing three transmission lines to the north, crossing the South Gila Valley, then turns northwest and into Arizona Public Service’s North Gila Substation, still paralleling the existing transmission lines. DOE will evaluate opportunities to consolidate existing transmission lines with the proposed new line.

What other alternatives will be considered in the EIS?

WAPA and DOE will consider any additional reasonable alternatives that result from comments received in response to the scoping process. To be considered reasonable, alternatives would need to meet the applicants’ and WAPA’s purpose and need, and be technically feasible and economically viable. WAPA and DOE will also consider reasonable alternatives that may be identified later in the EIS process.

Several alternative routes were identified in the scoping comments received and from a routing analysis and WAPA field investigations. In general, these routes can be characterized as refinements to the applicants? original proposed route. They address engineering constraints, take advantage of routing opportunities and reduce various identified environmental impacts.

The EIS will also consider the environmental impacts of the “No Action” alternative. Under the No Action alternative, the EIS will analyze the impacts associated with not approving an interconnection agreement and not issuing a Presidential permit.

Will there be other opportunities to provide comments?

DOE anticipates the EIS process will take about 14 to 16 months and will include the public information and scoping meetings; consultation and involvement with appropriate Federal, state, and local agencies, and tribal governments; public review and hearing(s) on the published Draft EIS; a published Final EIS; and publication of a Record of Decision.

After analyzing public concerns and possible impacts from the proposed project, WAPA in consultation with the cooperating agencies, will issue a Draft EIS. You will have 45 days to review this document and provide comments on it and the proposed project. WAPA expects the Draft EIS will be available for review in the fall of 2006.

WAPA will host a public hearing to receive comments on the Draft EIS during the review period. You may make oral comments on the proposed project at the hearing, submit written comments there or provide written or e-mail comments during the 45-day comment period.

WAPA will then review these comments before preparing a Final EIS. You will have another 30 days to review the final EIS. WAPA expects to issue the Final EIS in early 2007. WAPA and DOE will then make individual decisions on whether to move forward with their actions related to the proposed project. If approved, construction would follow the agencies’ decisions.

Last modified on June 29th, 2023