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Reciprocating engines are normally the least costly
cogeneration alternative in small power generating systems (less than 1 MW).
While relatively simple to operate, they are normally more costly to
maintain than any other cogeneration system alternative; averaging
$0.012-$0.020 per kWh of power generation per hour of operation. However,
wherever intermittent operation is desirable (such as in peak-shaving
applications), they are the most desirable alternative (since gas turbines
have such high operating and maintenance costs in these applications).
Reciprocating engines emit the most nitrogen oxides (NOx) of the
cogeneration designs and this alone can limit use in some areas of the
country. Always check with local environmental agencies for specific
guidance
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