IDEAS home Printed from
   My bibliography  Save this article

Exploration of economical sizing of gas engine and thermal store for combined heat and power plants in the UK


  • Fragaki, Aikaterini
  • Andersen, Anders N.
  • Toke, David


There has been discussion about the extent to which combined heat and power (CHP) plants with thermal stores are suitable for sustainable energy production. At the moment, in the UK the development of this type of plant is limited. This paper analyses the economics and optimum size of CHP operating with gas engines and thermal stores in British market conditions. This is achieved using energyPRO software. It is shown that, due to the big differences in electricity prices between day and night, the use of thermal stores could be profitable in the UK. The economical size of CHP plant for a district or community heating load of 20,000MWh per year is found to be a 3MWe gas engine with a 7.8MWh thermal store. In this case the analysis reveals that the use of a thermal store more than doubles the return on investments (as measured in net present value) compared with the same size of a plant without a thermal store. It is concluded that thermal stores can improve the overall economics of CHP plants in present British circumstances.

Suggested Citation

  • Fragaki, Aikaterini & Andersen, Anders N. & Toke, David, 2008. "Exploration of economical sizing of gas engine and thermal store for combined heat and power plants in the UK," Energy, Elsevier, vol. 33(11), pages 1659-1670.
  • Handle: RePEc:eee:energy:v:33:y:2008:i:11:p:1659-1670
    DOI: 10.1016/

    Download full text from publisher

    File URL:
    Download Restriction: Full text for ScienceDirect subscribers only

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    1. Dotzauer, Erik, 2002. "Simple model for prediction of loads in district-heating systems," Applied Energy, Elsevier, vol. 73(3-4), pages 277-284, November.
    2. Lund, H & Münster, E, 2003. "Modelling of energy systems with a high percentage of CHP and wind power," Renewable Energy, Elsevier, vol. 28(14), pages 2179-2193.
    3. Lin, Fu & Yi, Jiang, 2000. "Optimal operation of a CHP plant for space heating as a peak load regulating plant," Energy, Elsevier, vol. 25(3), pages 283-298.
    4. Bogdan, Željko & Kopjar, Damir, 2006. "Improvement of the cogeneration plant economy by using heat accumulator," Energy, Elsevier, vol. 31(13), pages 2285-2292.
    5. Onovwiona, H.I. & Ugursal, V.I., 2006. "Residential cogeneration systems: review of the current technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(5), pages 389-431, October.
    6. Dave Toke, 2005. "Are Green Electricity Certificates the Way Forward for Renewable Energy? An Evaluation of the United Kingdom's Renewables Obligation in the Context of International Comparisons," Environment and Planning C, , vol. 23(3), pages 361-374, June.
    7. Lund, Henrik, 2007. "Renewable energy strategies for sustainable development," Energy, Elsevier, vol. 32(6), pages 912-919.
    8. Lund, Henrik & Østergaard, Poul Alberg, 2000. "Electric grid and heat planning scenarios with centralised and distributed sources of conventional, CHP and wind generation," Energy, Elsevier, vol. 25(4), pages 299-312.
    9. Lund, Henrik, 2005. "Large-scale integration of wind power into different energy systems," Energy, Elsevier, vol. 30(13), pages 2402-2412.
    10. Khan, K. H. & Rasul, M. G. & Khan, M. M. K., 2004. "Energy conservation in buildings: cogeneration and cogeneration coupled with thermal energy storage," Applied Energy, Elsevier, vol. 77(1), pages 15-34, January.
    11. Berta, Gian Luigi & Prato, Alessandro Pini & Garbarino, Luca, 2006. "Design criteria for distributed cogeneration plants," Energy, Elsevier, vol. 31(10), pages 1403-1416.
    12. Alanne, Kari & Saari, Arto, 2004. "Sustainable small-scale CHP technologies for buildings: the basis for multi-perspective decision-making," Renewable and Sustainable Energy Reviews, Elsevier, vol. 8(5), pages 401-431, October.
    13. Pavlas, Martin & Stehlík, Petr & Oral, Jaroslav & Šikula, Jiří, 2006. "Integrating renewable sources of energy into an existing combined heat and power system," Energy, Elsevier, vol. 31(13), pages 2499-2511.
    14. Haeseldonckx, Dries & Peeters, Leen & Helsen, Lieve & D'haeseleer, William, 2007. "The impact of thermal storage on the operational behaviour of residential CHP facilities and the overall CO2 emissions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 11(6), pages 1227-1243, August.
    Full references (including those not matched with items on IDEAS)

    More about this item


    CHP; Sustainable energy; Thermal store;


    Access and download statistics


    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:energy:v:33:y:2008:i:11:p:1659-1670. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Haili He). General contact details of provider: .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.