Economic assessment of gas-steam systems taking account of variable loads

  • Sebastian Lepszy Politechnika Śląska Instytut Maszyn i Urządzeń Energetycznych Zakład Maszyn Przepływowych i Technologii Energetycznych
  • Tadeusz Tadeusz Chmielniak Politechnika Śląska Instytut Maszyn i Urządzeń Energetycznych
  • Daniel Czaja Politechnika Śląska Instytut Maszyn i Urządzeń Energetycznych


Increasing competition from high-power gas technologies on the energy market depends on many factors. Apart from the requirement to meet ecological criteria, the most important of them are: an improvement in thermal flexibility, favourable characteristics of performance under variable loads and the economic efficiency related thereto. The adaptability of gas technologies to changes in loads in the 24-hour cycle is now gaining special importance. This paper is focused on issues related to adapting the methodology of economic calculations to changing functions of gas technologies in the electricity generation sub-sector. In the new market environment, the economic model comprising a certain number of parameters (which usually characterize the base load) and taking account of revenues coming from this type of operation does not provide a full picture. First and foremost, it does not indicate additional revenues that could potentially be earned from new market possibilities related to rendering system services and lessening the environmental impact. Generally speaking, a more accurate approach to the assessment of gas-steam systems has to take account of basic parameters that determine thermal flexibility (start-up and shutdown times), issues related to maintaining availability, changes in efficiency under variable loads and emissions characteristics.


[1] ISO 11086: 1996 (E/F), Gas Turbines – Vocabulary

[2] Kaliski M. et al.: Natural Gas in Poland and the European Union. Archiwum Energetyki, Vol. XLII, No 1, 2012, pp. 93-107

[3] Janusz P.: Aktualna sytuacja na rynku gazu ziemnego-perspektywy rozwoju [Current situation on the natural gas market – prospects of development]. Polityka Energetyczna , Vol. 16, Book .2, 2013

[4] Kotowicz J.: Elektrownie parowo-gazowe [Steam-gas power plants]. Kaprint , Lublin, 2008

[5] Skorek J., Kalina J. : Gazowe układy kogeneracyjne [Gas turbine cogeneration systems].WNT, Warszawa 2005

[6] Sierpińska M., Jachna T.: Ocena przedsiębiorstwa według standardów światowych [An enterprise assessment according to the world standards]. PWN, Warszawa, 1999

[7] Skrzypek J.: Biznesplan Model Najlepszych Praktyk [Business plan – A model of best practices]. Poltex MT Biznes, December 2010

[8] Gulen S. Can, Mazumder I.: An Expanded Cost of Electricity Model for Highly Flexible Power Plants. ASME Paper GT2012-68299, 2012

[9] Tsukagoshi K., Muyama A., Masada J., Iwasaki Y., Ito E. : Operating Status of Uprating. Gas Turbines and Future Trend of Gas Turbine Development. Mitsubishi Heavy Industries Technical Review Vol. 44 No.4, 2007

[10] Maekawa A. : Evolution and Future Trend of Large Frame Gas Turbine for Power Generation. J. of Power and Systems, Vol. 5, No 2, 2011

[11] Siemens Combined Cycle Power Plants.

[12] J-series Gas Turbine.

[13] Balling L.: Fast Cycling and Rapid Start-up: New Generation of Plants Achieves Impressive Results. Modern Power Systems, January 2011

[14] Picard A. Meinecke G. : The Future Role of Fossil Power Generation.

[15] Technical Performance Gas Power Plants.


[17] Balling L.: Flexible Future for Combined Cycle. Modern Power Systems, December 2010
How to Cite
LEPSZY, Sebastian; TADEUSZ CHMIELNIAK, Tadeusz; CZAJA, Daniel. Economic assessment of gas-steam systems taking account of variable loads. Journal of Power Technologies, [S.l.], v. 95, n. 5, p. 54--62, june 2015. ISSN 2083-4195. Available at: <>. Date accessed: 17 sep. 2021.
Polish Energy Mix 2014

Most read articles by the same author(s)

Obs.: This plugin requires at least one statistics/report plugin to be enabled. If your statistics plugins provide more than one metric then please also select a main metric on the admin's site settings page and/or on the journal manager's settings pages.