“…In another study, Athanassopoulos et al (1999) took fuel, controllable costs and capital expenditure as inputs; generated pollution and accidents incurred as bad outputs, and electricity produced and plant availability as good outputs while (Burnett and Hansen, 2008) deployed capital, fuel costs, and operating costs as inputs, SO2 emission as bad output and generated power as good output. In a very similar study to ours, Färe et al (2005) employed labor, installed capacity, and fuel as inputs and SO2 emission and generated power as undesirable and desirable outputs, respectively. More recently, Sueyoshi and Goto (2011) used generation capacity, number of employees, coal, oil, and LNG 9 as inputs, CO2 emission as bad output and generation as good output for their study.…”