Astoria Station Simple-Cycle

Detailed Engineering and Design at Greenfield Site


Astoria Station Simple-Cycle
Deuel County, South Dakota
Otter Tail Power Company


Project Highlights:

  • Combustion Turbine: MHPSA M501GAC
  • Fuel: Natural Gas
  • Size: 250 MW
  • Project-Unique Features: Fast-start capability, first modular 501G, and construction schedule optimized for winter conditions

Project Description:

Otter Tail Power Company’s (OTP) Astoria Station is a new simple-cycle combustion turbine (CT) generating facility to be constructed on a greenfield site north of Astoria, South Dakota. In April, 2018, OTP awarded  Sargent & Lundy the contract to assist in complete detailed design, to provide procurement and project controls services, and to provide overall project technical support. The Astoria unit will consist of an MHPSA M501GAC CT and associated balance-of-plant (BOP) equipment.


Project Scope:

  • Procurement—Advise and make recommendations to OTP on division of scope of supply and contracting strategies for entire project; develop technical specifications for technical services, engineered equipment, and installation contracts; set performance guarantees, delivery milestones, and submittal requirements; serve as single point of contact to support OTP in resolving commercial inquires; and evaluate bids and issue letters of recommendation.
  • Project Controls—Develop and maintain master project schedule through detailed design phase; provide input to project financial forecast; and issue monthly engineering reports with performance indices and schedule updates.
  • Detailed Design—Develop design criteria for major engineering disciplines; establish standards for drawings, files, and naming conventions to be used for unit’s future operations and maintenance (O&M); develop detailed design in 3D model environment; perform necessary design calculations and analysis for technical decisions and equipment selection; verify proper integration of vendor-designed systems; develop issued-for-construction drawings (general arrangements, piping and instrumentation diagrams, piping isometrics, single-lines, master schematics, notes and details, site grading, foundations, and structural steel); develop and maintain lists for valves, pipelines, mechanical equipment, electrical equipment, input/output (I/O), and cables.
  • Technical Support—Attend meetings as necessary at supplier’s offices or factories; respond to requests for information during the commissioning and construction phase; conduct site visits during construction during critical activities; and review performance test results.

Schedule Milestones:

  • Project Award: April 2018
  • Issue Request for Proposal: June 2018
  • Receive Proposals: August 2018
  • Award Equipment Supply: December 2018
  • Commercial Operation: End of Q1 2021

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