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Compared with conventional power plants, coal gasification has several environmentalbenefits such as: 11.7 per cent less CO 2; 86.6 per cent less NOx; 93.4 per cent lessSOx; almost no particulate emissions; and 38.5 per cent less water utilization. Acomparison of emissions and resource utilization for different electricity generationtechnologies is given in Table 3-7. Converting coal to a liquid fuel (CTL) allows coal tobe utilized as an alternative to petroleum oil.Table 3-7: A comparison of different electricity generation technologiesEmission Pulverized coal Gasification Combined natural gascombustioncombustionCO 2(kg/kWh) 0.77 0.680 0.36SO 2(kg/MWh) 0.68 0.045 0.00NOx (kg/MWh) 0.61 0.082 0.09Water use (L/kWh) 4.62 2.840 2.16India needs a paradigm shift in technology intervention that involves poly-generationand multi-level utilization of gasification technology. Gasification facilities use a rangeof carbon-based feedstocks, such as natural gas, coal, petroleum, petcoke, biomassand industrial wastes. Currently, coal dominates as the feedstock with 36,315 MW thor51 per cent of the global syngas capacity (Figure 3-12). Petroleum fuels are the secondleading feedstock, with 17,938 MW thor 25 per cent of the total gasification capacity.80,000Figure 3-12: Global syngas capacity by feedstockSyngas (MWth)70,00060,00050,00040,00030,00020,00010,000In operationUnder constructionIn planning0Coal Petroleum Gas Petcoke Biomass/wasteAt present, Thermax is executing the following three projects in collaboration withvarious partner institutions:98