→ electricity grid transmission → end use. Here, you will
need to use outside references; see, for example, Dorf (1978,
2001) or other sources.
Who Owns Possible Environmental Credits from a Cogeneration System? In Example 1.6, we developed the cost
savings that may be possible if a cogeneration system is
used to replace an existing stand-alone boiler with electricity
purchase from a utility plant. Here we want to explore
the possibility of emission reduction, specifically carbon
dioxide reduction, if this cogeneration system is installed. An
interesting issue with a cogeneration system may be: Who
should receive environmental credit for any emission
reduction?
Assume the cogeneration system in Example 1.6 is
installed, thereby replacing the existing natural gas-fired standalone boiler and electricity purchase from a coal-fired utility
plant (as in Figure 1.5). Allow that the combustion of 1 MMBtu
(or 1 mSCF) of natural gas releases about 120 lb of carbon
dioxide. Burning 1000 lb of coal releases about 2400 lb of
carbon dioxide. Determine the total carbon dioxide emissions
at the processing site (within the fence line) and the utility
plant (within the fence line) both before and after cogeneration
installation.