Commodity Production Costs Report

Conventional Natural Gas Combined Cycle Power Plant

Electricity Operating Costs & Plant Construction Costs

5200 GWh/y United States-based plant | 107 Pages | Issue C | Q3 2024

This report examines the costs associated to Electricity generation from natural gas in the USA via conventional natural gas combined cycle. In this process F-class combustion turbines (CT) supplemented with heat recovery steam generators (HRSG) and steam turbines (ST) are employed to Electricity generation.

The report provides a comprehensive study of Electricity production and related Electricity production cost, covering three key aspects: a complete description of the Electricity production process examined; an in-depth analysis of the related Electricity plant capital cost (Capex); and an evaluation of the respective Electricity plant operating costs (Opex).

The Electricity production process description includes a block flow diagram (BFD), an overview of the industrial site installations, detailing both the process unit and the necessary infrastructure, process consumption figures and comprehensive process flow diagrams (PFD). The Electricity plant capital cost analysis breaks down the Capex by plant cost (i.e., ISBL, OSBL and Contingency); owner's cost; working capital; and costs incurred during industrial plant commissioning and start-up. The Electricity plant operating costs analysis covers operating expenses, including variable costs like raw materials and utilities, and fixed costs such as maintenance, labor, and depreciation.

Key reference(s): ?

Electricity Production Cost Report Process Schematic

The process under analysis comprises two thermodynamic cycles: (1) Brayton Cycle; and (2) Rankine Cycle.

Braxton Cycle. In the first cycle, occurred in a combustion turbine, compressed air then runs through a mixing chamber where natural gas is added. The pressurized air and natural gas mixture is then ignited in an expansion cylinder and energy is released. High pressure hot gas from combustion expands through the turbine, spinning rotating blades. The rotating blades then spin a shaft. This cycle is known as Brayton cycle. In the case of the process approached in this report, the shaft is, in fact, a generator that produces electricity.

Rankine Cycle. The waste heat from the gas turbine exhaust is used in a boiler to evaporate high pressure water, forming high pressure dry saturated steam, which expands through a steam turbine, generating electricity. The steam expansion decreases its temperature and pressure, which may cause some condensation. The wet low pressure steam is then condensed at a constant pressure to become saturated water that will be reused in the cycle. This thermodynamic cycle is called Rankine Cycle.

The use of the heat released in the Brayton Cycle as energy to generate the high pressure steam in the Rankine Cycle increases the total energy extracted from the natural gas. This entire process is also called Brayton-Rankine combined cycle.

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  • Production Process Information
  • Process Consumptions
  • Labor Requirements
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 80 Pages | 22 Tables | 9 Images

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Table of Contents


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  • Production Process Information
  • Process Consumptions
  • Labor Requirements
  • Plant Capital Cost Summary
  • Operating Cost Summary
  • Production Costs Datasheet
  • Plant Capital Cost Details
  • Operating Cost Details
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 90 Pages | 28 Tables | 13 Images

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Table of Contents


Features
  • Production Process Information
  • Process Consumptions
  • Labor Requirements
  • Plant Capital Cost Summary
  • Operating Cost Summary
  • Production Costs Datasheet
  • Plant Capital Cost Details
  • Operating Cost Details
  • Plant Cost Breakdowns
  • Plant Capacity Assessment
  • Process Flow Diagrams
  • Costs in Different Countries Add-on
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  • 107 Pages | 34 Tables | 22 Images
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Content Highlights

Plant Capital Cost Summary

Summary outlining the capital cost required for building the Electricity production plant examined.

Plant Capital Cost Details

Detailing of fixed capital (ISBL, OSBL & Owner’s Cost), working capital and additional capital requirements.

Plant Cost Breakdowns

Breakdown of Electricity process unit (ISBL) costs and infrastructure (OSBL) costs; plant cost breakdown per discipline.

Operating Costs Summary

Summary presenting the operating variable costs and the total operating cost of the Electricity production plant studied.

Operating Cost Details

Detailing of utilities costs, operating fixed costs and depreciation.

Plant Capacity Assessment

Comparative analysis of capital investment and operating costs for different Electricity plant capacities.

Production Process Information

Block Flow Diagram, descriptions of process unit (ISBL) and site infrastructure (OSBL).

Process Consumptions

Raw materials and utilities consumption figures, by-products credits, labor requirements

Process Diagrams

Process flow diagrams (PFD), equipment list and industrial site configuration

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