International Scientific Journal

Authors of this Paper

External Links


The proper characterization of energy suppliers is one of the most important components in the modelling of the supply/demand relations of the electricity market. Power generation capacity i. e. power plants constitute the supply side of the relation in the electricity market. The supply of power stations develops as the power stations attempt to achieve the greatest profit possible with the given prices and other limitations. The cost of operation and the cost of load increment are thus the most important characteristics of their behaviour on the market. In most electricity market models, however, it is not taken into account that the efficiency of a power station also depends on the level of the load, on the type and age of the power plant, and on environmental considerations. The trade in electricity on the free market cannot rely on models where these essential parameters are omitted. Such an incomplete model could lead to a situation where a particular power station would be run either only at its full capacity or else be entirely deactivated depending on the prices prevailing on the free market. The reality is rather that the marginal cost of power generation might also be described by a function using the efficiency function. The derived marginal cost function gives the supply curve of the power station. The load level dependent efficiency function can be used not only for market modelling, but also for determining the pollutant and CO2 emissions of the power station, as well as shedding light on the conditions for successfully entering the market. Based on the measurement data our paper presents mathematical models that might be used for the determination of the load dependent efficiency functions of coal, oil, or gas fuelled power stations (steam turbine, gas turbine, combined cycle) and IC engine based combined heat and power stations. These efficiency functions could also contribute to modelling market conditions and determining the environmental impact of power stations.
PAPER REVISED: 2010-04-01
PAPER ACCEPTED: 2010-05-07
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2010, VOLUME 14, ISSUE Issue 3, PAGES [821 - 834]
  1. Bihari, P., et all., Power Plant Efficiency Data for an Electrical Energy Market Model, Technical Report, BUTE Department of Energy Engineering, Budapest, 2008
  2. Kim, T. S., Comparative Analysis on the Part Load Performance of Combined Cycle Plants Considering Design Performance and Power Control Strategy, Energy, 29 (2004), 1, pp. 71-85
  3. Zhang, N., Cai, R., Analytical Solutions and Typical Characteristics of Part-Load Performances of Single Shaft Gas Turbine and Its Cogeneration, Energy Conversion and Management, 43 (2002), 9-12, pp. 1323-1337
  4. Lévai, A., Thermal Power Plants I (in Hungarian), Nehézipari Könyv és Folyóiratkiadó Vállalat, Budapest, Hungary, 1953
  5. Stróbl, A., Efficiency Functions of Power Plants (in Hungarian) Technical Report. ETV-ERÕTERV Ltd., Budapest, Hungary, 2007
  6. Arrieta, F. R. P., Lora, E. E. S., Influence of Ambient Temperature on Combined-Cycle Power-Plant Performance, Applied Energy, 80 (2005), 3, pp. 261-272
  7. Harvey, S., Carcasci, C., Berntsson, T., Gas Turbines in District Heating Combined Heat and Power Systems: Influence of Performance on Heating Costs and Emissions, Applied Thermal Engineering, 20 (2000), 12, pp. 1075-1103
  8. Kaewboonsong, W., Kuprianov, V. I., Chovichien, N., Minimizing Fuel and Environmental Costs for a Variable-Load Power Plant (co-)Firing Fuel Oil and Natural Gas, Part 1: Modeling of Gaseous Emissions from Boiler Units, Fuel Processing Technology, 87 (2006), 12, pp. 1085-1094
  9. Poulin, A., et al., Load Duration Curve: A Tool for Technico-Economic Analysis of Energy Solutions, Energy and Buildings, 40 (2008), 1, pp. 29-35
  10. Afgan, N. H., Carvalho, M. G., Hovanov, N. V., Modeling of Energy System Sustainability Index, Thermal Science, 9 (2005), 2, pp. 3-16

© 2023 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence