Comparative Assessment of Thermal Power Systems Performance Under Uncertainty


  •   Anthony Kpegele Le-ol

  •   Sidum Adumene

  •   Kenneth Israel


This work presents a comparative analysis of the thermo-economic performance of a simple, retrofitted and built-in combined cycle power plants within the Delta. The data were obtained from a 25MW gas turbine plant-based engine, retrofitted and MATLAB software was used to model the thermodynamic performance of the plants. The economic prediction of the plants was done using a developed net present value(NPV), internal rate of return (IRR), cost of investment (COR) and payback period (PBP).  The economic concept for plants performance was analysed under uncertainty constraints of energy need, operating conditions, energy cost and energy supply variability. Three plants configuration; simple gas turbine (SGT), retrofitted combined cycle (RCC) and Built-in combined cycle (BCC) was analysed based on these economic performance indicators. The three configurations show a positive NPV, PBP and IRR, with the BCC showing the optimum return on investment. Although the RCC show minimum initial cost on investment compare to BCC, the BCC demonstrates greater overall return with an NPV of $30,755,454.18, IRR of 17.1% and PBP of 6.3years for the period of 20years. The analysis shows cash flow of 34.1% and 52.6% for the RCC and BCC respectively. The result also showed that the plant performs better at a lower ambient temperature and higher relative humidity with a higher return on investment. This research provides great insight into the thermo-economic analysis, and benefits of combined cycle power plant and will aid energy system investors on the choice of the power plant for power generation in the Niger Delta.

Keywords: Net-Present-Value, Internal Rate of Return, Payback Period, Simple-Gas-Turbine, Combined-Cycle


Ameri, M., Ahmad, P., & Khanmonhamed, S, “Energy Analysis of Supplementary”, International Conference on Mechanical Eng, No. 2053, 2007 Tehran, Iran.

Korakianitis, T., Grantstrom, J., Wassingho, P. & Massardo, A. F, “Parametric Performance of Combined- Cogeneration Power Plants with Various Power and Efficiency Enhancement”, Journal of Engineering for Gas Turbine and Power, vol 127, pp 65-72, 2005.

Briesch, M.S, Bannister R.L., Diakunchak, I.S, & Huber, D, “A Combined Cycle Design to Achieve Greater than 60 Percent Efficiency”, Journal of Engineering for Gas Turbine and Power, vol 117, pp734-741, 1995.

Adumene, S, “Load-Based Exergetic Assessment of an Offshore Thermal Power Plant in an Equatorial Environment”. Studies in Engineering and Technology, vol 3, pp19-27, 2015.

Kaushika, S.C., Reddya, V.S., & Tyagi, S.K, “Energy and Exergy Analyses of Thermal Power Plants,” A Review- Renewable and Sustainable Energy Reviews, vol. 15, pp. 1857–1872, 2011.

Sheikhbeigi, B., & Ghofrani, M.B., “Thermodynamic and Environmental Consideration of Advanced Gas Turbine Cycles with Reheat and Recuperator,” International Journal Environment, Science, Technology, vol. 4, No. 2, Pp. 253-262, 2007

Moran, M.J. “Thermal System Design and Optimization”, John Wiley and Sons. (1996)

Yadav, R., “Steam & Gas Turbine and Power Plant Engineering” Central Publishing House, Allahabab, 2009.

Adumene, S. and Lebele-Alawa, B.T, Performance Optimization of Dual Pressure Heat Recovery Steam Generator (HRSG) in the Tropical Rainforest. Engineering, vol.7,pp347-364,2015

Murad, A.R., Amirabedin, E., Yilmazoglu, M.Z., & Durmaz, A. “Analysis of Heat Recovery Steam Generators in Combined Cycle Power Plants,” The Second International Conference on Nuclear and Renewable Energy Resources, Ankara, Turkey. 2010.

Nag, P.K. “Power Plant Engineering”. 3rd ed. Tata McGraw-Hill Education Private Limited, New Delhi, India, 2011.

Ragland, A., Vogt-NEM, Stenzel, W. –EPRIsolutions, “Combined Cycle Heat Recovery Optimization” Proceedings of 2000 International Joint Power Generation Conference, Miami Beach, Florida, July 23-26. (IJPGC 2000-15031). Pp.1781-1787, 2000.

Nkoi, B., Pilidis, P. and Nikolaidis, T. “Performance Assessment of Simple and Modified Cycle Turboshaft Gas Turbine”, Propulsion and Power Research vol 3: Issue 2 pp 96-106, 2013.

Bruckner, H., & Emsperger W, “Retrofitting Fossil Fired Power Plant with Gas Turbines as a Means of Increasing Output and Efficiency”, International Forum on Mathematical Modeling of Process in Energy Systems, Sarajevo, Yugoslavia, 1989.

Lebele-Alawa, B.T and Le-ol, A.K, “Improved Design of a 25 MW Gas Turbine Plant using Combined Cycle Application”, Journal of Power and Energy Engineering, vol 3, pp1-14, 2015.

Nkoi, B., Israel, K. and Adumene, S, “Performance Analysis of an Energy System in the Tropical Rainforest: A Thermo-Economic Approach”. Journal of Power and Energy Engineering, vol 6, pp 8-20, 2018.

Bejan A., Tsatsaronis, G., & Moran, M, “Thermal Design and Optimization”. John Wiley and Sons, Hoboken, New Jersey USA, 1996.

Klapp, J., Cervantes-Cota, J., Federico, J., & Alcala, C, “Towards a Clearer Plant: Energy for the Future”, Springer Berlin Heidelberg New York, 2007.

Hoffmann, S., Bartlett, M., Finkenrath, M., Evulet, A., & Ursin, T. P, “Performance and Cost Analysis of Advanced Gas Turbine Cycles with precombustion CO2 Capture”. ASME GT 2008-51027, ASME Turbo Expo 2008; Power for Land, Sea, and Air, 2008.

Frangopouos, C., “Introduction to Environomics. Symposium on Thermodynamics and Energy Systems”. ASME Winter Annual Meeting, Atlanta, Ga. New York. Vol 191, pp 49-56, 1991.

Pelster, S., Favrat, D., & von Spakovsky, M. R. “The Thermoeconomic and Environomic Modeling and Optimization of the Synthesis, Design and Operation of Combined Cycles with Advanced Option”. Journal of Engineering for Gas Turbine and Power. vol123, pp 717-726, 2001.

Silveira, J. L. & Tuna, C. E., “Thermoeconomic Analysis Method for Optimization of Combined Heat and Power Systems” - Part I, Progress in Energy and Combustion Science, vol 29, Issue 6, pp 479–485, 2003.

Erdem, H. H., Sevilgen, S. H., Çetin, B. & Akkaya, A. V.), “The Analysis of Specific Product Cost of Cogeneration System”, In Proceedings of the 1st International Mechanical Engineering Symposium (CMES1 '04), Cappadocia, Turkey, pp 121–127, 2004.

Erdem, H. H., Dagdas, A., Sevilgen, S. H., “Thermodynamic Analysis of an Existing Coal-fired Power Plant for District Heating and Cooling Application”, Applied Thermal Engineering, vol 30, Issue 2-3, pp 181–187, 2010.

Nkoi, B., Pilidis, P. & Nikolaidis, T., “Techno-economic Assessment of Large Scale Aero-Derivative Industrial Gas Turbines Combined-Heat-and-Power”, International Journal of Engineering and Technology, vol 5, issue4, pp225-240, 2015.

Brealey, R. A., & Myers, S. C, “Principles of Corporate Finance.” The Ed. McGraw-Hill Irwin, New York, NY. 2003.

National Renewable Energy Laboratory (NREL)), Cost and Performance Data for Power Generation Technologies, Black and Veatch Corporation. pp. 9-35, 2012.

DECC. Industrial Energy Prices Statistics. (2013) Available from Date accessed: 25 June 2016

Western Electric Co-ordinating Council (WECC) Capital Cost Review of Generation Technology, Energy and Environment Economics (2014), Inc. Available from Date Accessed: 12 July 2016.

National Electricity Regulatory Commission (NERC), Multi Year Tariff Order (MYTO) - 2015 for Port Harcourt Electricity Distribution Company, January 2015 – December 2024. pp 10


Download data is not yet available.


How to Cite
Kpegele Le-ol, A., Adumene, S. and Israel, K. 2018. Comparative Assessment of Thermal Power Systems Performance Under Uncertainty. European Journal of Engineering and Technology Research. 3, 7 (Jul. 2018), 50–57. DOI: