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CPV Sentinel Energy Project - Docket # 07-AFC-03

Project Title:

CPV Sentinel Energy Project (Sentinel)


The Applicant: CPV Sentinel, LLC

Mark O. Turner, Director
Competitive Power Ventures, Inc.
55 2nd Street, Suite 525
San Francisco, CA 94105


The proposed project site is approximately 1.3 miles east of State Route(SR) 62 (also referred to as Twentynine Palms Highway), 1.7 miles north of Interstate 10 (I -10), and 1.3 miles west of Indian Avenue. Powerline Roads North and South run along the south side of the property. Access to the site will be available from Dillon Road north onto the proposed access road to the project site. Access to Dillon Road is from the Dillon Road exit off SR 62 and from the Indian Avenue exit off the I -10.

The main project features will consist of a 37 acre power plant site, 14 acre construction laydown area, 3,250 feet of transmission lines, and 2.6 miles of natural gas pipeline. The power plant, transmission lines, and portions of the gas line and construction laydown area will be located within unincorporated Riverside County. Portions of the construction laydown area and portions of the proposed gas line route will be located within the city of Palm Springs. The site is situated approximately 8 miles northwest of the center of Palm Springs and 4.5 miles west of the center of Desert Hot Springs.


Construction is expected to cost approximately $440 million.


The proposed project will be constructed, commissioned, owned, and operated by CPV Sentinel, LLC (CPV Sentinel). CPV Sentinel anticipates selling the capacity, energy, and ancillary services under several longterm contracts to one or more load serving entities. The Application for Certification is being reviewed by the California Energy Commission under a 12-month review process.


Construction of the power plant would occur over an 18 month period (from December 2008 to May 2010).

Commercial Operation:

Operation of the first five turbine units is planned to begin by March 2010, and the final three units are planned to begin operation in May 2010.

Transmission Facilities:

Electricity generated by the proposed project will be delivered to the existing SCE Devers substation via a generation tie connecting the project station switchyard to the Devers substation at the 220 kilovolt (kV) bus. It is currently anticipated that SCE will execute contracts with CPV Sentinel under which SCE will be responsible for final design, engineering, construction, operation, and maintenance of the generator tie to the Devers substation. SCE will seek a Certificate of Public Convenience and Necessity (CPCN) from the California Public Utilities Commission (CPUC) for the generation tie. The environmental impacts associated with constructing and operating the transmission line are being analyzed in this CEC proceeding.


Fuel will be supplied by an extension of a 24 inch-diameter natural gas line extending from the existing Indigo Energy Facility, located 2.6 miles from the proposed Sentinel project site.

Water Supply:

The proposed project will also include installing a potable water line extension from a current municipal water line existing along Dillon Road. The proposed project will use a cooling tower for LMS intercooling and oil cooling. Water for power plant operations will be provided by the Mission Springs Water District (MSWD). Reclaimed water will be supplied by the Mission Springs Water DistrictÕs Horton Wastewater Treatment Plant (WWTP), located approximately 5 miles from the project site. Wastewater from the Horton WWTP will be treated to tertiary levels by a newly constructed tertiary treatment system funded by the MSWD. The expansion of the wastewater treatment plant is an independent project formerly planned by the MSWD, and it will conduct its own environmental review of the expansion. The reclaimed water will be sent to existing percolation ponds located adjacent to the Horton WWTP, where it will percolate into the underlying Coachella Valley Groundwater Basin (Basin) and be banked for later use by the proposed Sentinel project. The Horton WWTP will supply, on average, 1,500 acre-feet per year (afy) of reclaimed water. Of this, the proposed project operations will use a maximum of 1,100 afy. The proposed project will access its banked water supply via onsite or nearby wells that overlie the same Basin.

Air Quality


Emission Controls:

The South Coast Air Quality Management District (SCAQMD) is the local district with authority to implement and enforce air quality regulations. The SCAQMD prepares an Air Quality Plan to define its strategies for attaining the state and federal ambient air quality standards, and its relevant control measures for implementing those strategies. The proposed project is required to secure a preconstruction Determination of Compliance from the SCAQMD, and to demonstrate continued compliance with regulatory limits. Permitting requirements will include Best Available Control Technology (BACT) and offsetting of emissions.


The proposed project will use a zero liquid discharge (ZLD) system, comprised of membrane-based wastewater treatment processes (microfiltration and reverse osmosis) coupled with a crystallizer system. This process will result in zero liquid wastewater discharge from the site.

Land Use

The 37 acre proposed power plant site is currently vacant, with the exception of an unoccupied dwelling unit at the southeastern corner of the site. The surrounding area is primarily characterized by industrial use with extensive development of wind energy and transmission infrastructure. The Devers substation is approximately 700 feet to the west of the proposed project site and the Indigo Energy Facility is approximately 1.8 miles to the southeast. The nearest occupied residence to the power plant site is approximately 330 feet to the east. CPV Sentinel has an option to acquire this property. The project site was selected to optimize nearby access to a natural gas fuel supply line and tie-in location to the SCE transmission system at the Devers substation, as well as to minimize environmental impacts. The proposed power plant site is zoned W 2 (Controlled Development Area) and designated as PF (Public Facilities) in the Riverside County General Plan. Electrical power-generating facilities are permitted uses within this zoning district and General Plan designation.

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