Table 3 compares the annual emissions of a co-generation plant producing 11 Mwe of electricity and 9 tons of steam per hour at a 70% capacity utilization with those of a conventional, separated system.

TABLE 3

Comparison of Emissions From

Cogeneration and Conventional Energy Technologies in Tons/Year
PLANT SYSTEM/ EMISSIONS Particulates SO2 NOX CO2
Conventional: oil-fired steam plus coal-fired electricity 90 1060 410 206,000
Coal-fired cogenerating steam turbine 100 1190 700 188,000
Gas-fired cogenerating steam turbine 10 70 70 107,000
Cogenerating gas turbine 3 15 140 111,000

Data from Natural Gas in Developing Countries,16.

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