If you are interested in further information on the topic economics of power plants, the following publication provide more insights:
Zweifel P., Praktiknjo A., Erdmann G. (2017). Energy Economics – Theory and Applications, Springer, ISBN: 9783662530221
If you are interested in further literature on the topic portfolio theory, the following publications provide more insights:
Elton E.J., Gruber M.J., Brown S.J., Goetzmann W.N. (2007). Modern Portfolio Theory and Investment Analysis, John Wiley and Sons, Inc.ISBN-13: 978-0470050828
Brigham E., Ehrhardt M. (2016). Financial Management: Theory and Practice, South-Western CENGAGE Learning, Mason, USA, ISBN-13: 978-1305632295
If you are interested in further literature on the topic portfolio optimization of power generation assets, the following publication provide more insights:
Bazilian M., Roques F. (2008). Analytical Methods for Energy Diversity & Security: A tribute to Shimon Awerbuch. Elsevier Science, ISBN: 9780080568874
In the list, you will find selected scientific papers on the topic portfolio optimization of power generation assets:
Awerbuch S., Berger, M. (2003). Applying Portfolio Theory to EU Electricity Planning and Policy-Making, IEA/EET Working Paper No.EET/2003/03, IEA/OECD, Paris, TRN: SE0307242
Bar-Lev D., Katz S. (1976). Portfolio Approach to Fossil Fuel Procurement in the Electric Utility Industry. The Journal of Finance, XXXI, No. 3: 933-947, https://doi.org/10.1111/j.1540-6261.1976.tb01935.x
Roques F., Newbery D., Nuttall W. (2008). Fuel mix diversification in liberalized electricity markets: A mean-variance portfolio theory approach. Energy Economics, 30(4): 1831–1849, https://doi.org/10.1016/j.eneco.2007.11.008
Westner G., Madlener R. (2010). The benefit of regional diversification of cogeneration investments in Europe: A mean-variance portfolio analysis. Energy Policy, 38(12): 7911–7920, https://doi.org/10.1016/j.enpol.2010.09.011
Westner G., Madlener R. (2011). Development of cogeneration in Germany: A mean-variance portfolio analysis of individual technology’s prospects in view of the new regulatory framework. Energy, 36: 5301–5313, https://doi.org/10.1016/j.energy.2011.06.038