- Docket Number
- 200 MW
- Alameda County
- Simple Cycle
- Project Status
- Operational (Natural Gas-Fired)
- Project Type
- Application for Certification
The Mariposa Energy Project (MEP) is located in northeastern Alameda County, approximately 7 miles northwest of Tracy, 7 miles east of Livermore, 6 miles south of Byron, and approximately 2.5 miles west of the community of Mountain House. The facility is southeast of the intersection of Bruns Road and Kelso Road on a 10-acre portion of a 158-acre parcel (known as the Lee Property) immediately south of the Pacific Gas and Electric Company Bethany Compressor Station and 230 kilovolt Kelso Substation.
MEP is a 200-megawatt (MW) natural gas-fired, simple-cycle generating facility consisting of four General Electric (GE) LM6000 PC-SPRINT combustion turbine generators and associated equipment. Linear facilities include a 580-foot natural gas pipeline and a 1.8-mile water connection with the Byron Bethany Irrigation District.
On July 30, 2015, the California Energy Commission approved a Post-Certification Amendment (TN 205635) for the installation of supplemental, temporary water storage tanks for use during a possible water curtailment. The backup temporary water supply tanks were necessary to ensure an adequate water supply to MEP if water delivery was curtailed.
- Notice of Determination for Approval of Proposed Changes in the General Plant Arrangement, Not in Docket, 9/15/2011, Staff approval to move the water tanks, and relocate several buildings and ancillary equipment, there are no proposed changes to the location of the combustion turbine exhaust or the firewater pump exhaust stacks identified in the Final Decision.
- Approval of Verification Language Change for BIO-16, Not in Docket, 05/21/2012, Staff approval of verification change for BIO-16.
- Order Approving a Petition to Increase the Maximum Allowable Hourly and Daily Fuel/Heat throughput Rates for the combustion turbines, TN 71276, 06/14/2013, Order No. 13-0612-06, Commission approval to increase the maximum allowable hourly fuel/heat throughput rates for combustion turbines from 481 MMBtu/hour/turbine to 500 MMBtu/hour/turbine, and the maximum allowable daily fuel/heat throughput from 11,544 MMBtu/day/turbine to 12,000 MMBtu/day/turbine.
- Notice of Determination for Approval to Install Supplemental, Temporary Water Supply Tanks for Use During a Possible Water Curtailment, TN 204912, 06/05/2015, Staff approval to install supplemental, temporary water supply tanks for use during a possible water curtailment.
- Order Approving A Petition to Amend to Install Supplemental, Temporary Water Storage Tanks, TN 205635, 08/04/2015, Order No. 15-0730-04, Commission approval to install one of two options for short-term water storage. Option 1 is the installation of a temporary, approximately 1.70 million-gallon (MG) tank and a smaller, approximately 0.68 MG tank for 2.38 MG total capacity. Option 2 is the installation of one, approximately 1.03 MG tank and one, approximately 0.68 MG tank with 1.71 MG total capacity.
Attention: Non-hypertext items above will need to be requested from the Compliance Project Manager, along with the document TN number, if provided above.
Power Plant Certification and Exemption Processes
The CEC has the exclusive authority to certify all thermal power plants 50 megawatts (MW) and larger and related facilities proposed for construction in California. The Application for Certification (AFC) process is a certified regulatory program under the California Environmental Quality Act (CEQA). As a certified regulatory program, the CEC does not prepare environmental impact reports (EIRs) in an AFC proceeding, but instead prepares environmental assessment documents that are functionally equivalent to EIRs. A certificate issued by the CEC is in lieu of any permit, certificate, or similar document otherwise required by any state, local or regional agency, or federal agency to the extent permitted by federal law, and supersedes any applicable statute, ordinance, or regulation of any state, local, or regional agency, or federal agency to the extent permitted by federal law.