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The purpose of this paper is to investigate the effect of increasing electricity price on compensated variation (CV) and deadweight loss (DWL) of different income groups in Iran over the 1967-2004 period. An autoregressive distributed lag (ARDL) model is employed and five electricity demand functions are estimated for different income groups and based the estimates, CV and DWL are calculated. The effects of electricity price increase on CV and DWL are examined and the following results are obtained: • Comparing CV in different income groups shows that CV increases from the poor to the rich. • Comparing DWL in different income groups shows that DWL increases from the poor to the rich. • By increasing electricity price and using direct subsidy, the welfare of low and middle income groups increase while the welfare of high income groups decrease.

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The purpose of this study is thermo-economic analysis of a combined fuel cell and micro gas turbine power plant cycle for using in small scale CHP systems. Since the fuel cell is the main source of power generation in hybrid systems, in this study, complete electrochemical, thermal and thermodynamic calculations are performed to obtain more accurate results; and unlike most studies, the cell temperature is not assumed constant. The performance analysis of the hybrid system shows that increasing the pressure and air to fuel ratio, causes to loss of electrical efficiency and increase in the electricity price because of reduction in cell and turbine inlet gas temperatures. The other results of this study show that considering the economic life of the system, making use of this type of hybrid systems is economical and generates less electricity price in comparison with micro gas turbine.