Coachella U2 Rotor Removal, Inspection, Repair Project (No. 10625323)


SCH Number
Public Agency
Imperial Irrigation District
Document Title
Coachella U2 Rotor Removal, Inspection, Repair Project (No. 10625323)
Document Type
NOE - Notice of Exemption
Document Description
Coachella Unit 2 gas turbine started operations in 1973 rated at 23.15MW. Records show that the generator and turbine have never been overhauled, except for a hot gas path turbine inspection once. Based on Coachella’s gas turbine plant operating profile, the OEM recommends performing a major overhaul every 15 years. Presently, the unit has a generator field ground fault. On August 8th 2023, on-site generator electrical testing was performed on the Unit 2 generator. Based on the field testing, the unit does not meet operational expectations from an electrical standpoint: A generator rotor ground problem was detected. To address the root cause of the generator rotor fault, the rotor was determined to need a full rewind. The Coachella gas turbines are IID’s peak season generators that are critical to the reliable operation of the IID Balancing Authority. The Coachella Generating Station gas turbines units 1 and 2 along with units 3 and 4 are critical for providing System Operations Center with voltage support, non-spin reserve capacity and reactive regulation. Repair of the rotor will result in reduced life cycle costs and increased reliability and availability of the turbine generator.

Contact Information

Donald Vargas
Agency Name
Imperial Irrigation District
Job Title
Environmental Compliance Administrator
Contact Types
Lead/Public Agency / Project Applicant


Other Location Info
Northeast of the Shady Lane and Bagdad Avenue intersection in Coachella, CA.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Sec.15302 (Class 2)
Reasons for Exemption
The project is exempt under Section 15302 (Class 2 exemption) for the reason that it entails the replacement or reconstruction of existing structures and facilities where the new structure will be located on the same site as the structure replaced and will have substantially the same purpose and capacity as the structure replaced, this exemption includes but is not limited to the replacement or reconstruction of existing utility systems and/or facilities involving negligible or no expansion of capacity.
County Clerk


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