Western Farmers Electric Cooperative (WFEC) is pursuing a construction permit from the Oklahoma Department of Environmental Quality for an addition to the gas-fired Mooreland Generating Station.
WFEC has submitted a Prevention of Significant Deterioration (PSD) construction permit application for the proposed addition of a combined-cycle combustion turbine and associated support equipment to the existing Mooreland plant, located 1.2 miles west of Mooreland, Okla. The DEQ began taking public comment on the draft permit on May 9.
The Mooreland Unit 4 Combined Cycle Project will be a single 360-MW (nominal) combustion turbine facility that will include one F-class combustion turbine (with two different vendor options for the combustion turbine as WFEC has not selected the manufacturer), one heat recovery steam generator (HRSG) with duct firing and one steam turbine. The Mooreland Unit 4 combustion turbine will be designed to burn pipeline-quality natural gas only.
In addition to the Mooreland Unit 4 combustion turbine, a cooling tower (which will be slightly different for each combustion turbine option), emergency diesel generator, and fuel oil storage tank will also be included as part of the project.
The combustion turbine (A-4) will be operated solely in combined-cycle mode and will be permitted for 8,760 hours per year. The combustion turbine will be one of the following:
- A General Electric 7FA.05 combustion turbine with a nominal output of 204 MW. The HRSG will be complete with duct firing (maximum heat input of 820.5 MMBtu/hr) and, with the steam turbine, the overall estimated output will be a nominal 300 MW (about 388 MW maximum, gross, at full capacity and fully fired).
- A Siemens SGT6-5000F5 combustion turbine with a nominal output of 232 MW. The HRSG will be complete with duct firing (maximum heat input of 820.3 MMBtu/hr) and, with the steam turbine, the overall estimated output will be a nominal 350 MW (approximately 410 MW maximum, gross, at full capacity and fully fired).
WFEC operates the Mooreland Generating Station, originally constructed in 1963, to generate wholesale electricity which is transmitted over WFEC’s system. Mooreland currently consists of three high-pressure boilers that burn locally-produced natural gas. The generators are peaking units which operate only when it is economically feasible.
Western Farmers Electric is a generation and transmission cooperative that is headquartered in Anadarko, Okla. It supplies the electrical needs of 18 member cooperatives in Oklahoma, along with Altus Air Force Base, plus four cooperatives in New Mexico, and other power users in Kansas and Texas.
Said WFEC’s 2012 annual report: “In 2012, WFEC executed a long-term [power purchase agreement] PPA with Calpine, Inc. (Calpine) that would satisfy the majority of WFEC’s needs, beginning in 2014. However, WFEC’s ability to obtain firm transmission delivery from [the Southwest Power Pool] SPP is proving to be a formidable obstacle. As a result of the uncertainty of obtaining the firm transmission necessary to implement the Calpine PPA, WFEC embarked upon a parallel path for self-build of a combined cycle resource located at an existing WFEC facility near Mooreland. In either case, the Calpine PPA option or the self-build option, WFEC will be prepared to meet its customers’ firm capacity needs when called upon.”