Fuzzy sets theory is proposed as an alternative to the probabilistic approach for assessing portfolios of power plants, in order to capture the complex reality of decision-making processes. This paper presents different fuzzy portfolio selection models, where the rate of returns as well as the...

The promotion of electricity from renewable energies in Germany causes difficulties in the profitable operation of many modern conventional power plants. Nevertheless, fluctuating availability of power from renewable energy sources requires flexible conventional plants, i.e. power plants which...

The liberalization of the energy markets and the merit order effect lead to difficulties in the operation even of modern, highly energy-effcient conventional power plants ('missing money problem'). Their operation often becomes unprofitable, so that sometimes the only remaining option is to...

In this paper we apply fuzzy set theory to the portfolio optimization of power generation assets, using a semi-mean absolute deviation (SMAD) model as a benchmark and a fuzzy semi-mean absolute deviation (FSMAD) model for comparison. The two models are applied to five onshore wind power plants...