The originally planned units for heat and electricity co-generation system based on fuel coal in one place of Guangdong Province may obtain better economic benefits

but its atmosphric pollutant emission is comparatively high.Under condition of higher electricity price for connecting units onto the power grid

the units planned originally for heat and electricity co-generation based on natural gas

the economic benefits of them can compete with that of units in co-generation system based on fuel coal

but the heat/electricity ratio in this case is smaller

the integral environmental benefits being still not ideal.For this

it is recommended to adopt units for cool

heat

and electricity triple co-generation system

although the generated electricity is smaller in this case

the utilization coefficient of energy

however

being enhanced

and the environmental benefits being also better.