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prime power systems, engine generators are run in response to
connected load. If load increases to a predetermined level,
additional generators are automatically started, synchronized to the
generator bus, and share load with the running generators. If
load decreases to a predetermined level, excess generators are
automatically removed from the bus and shut down, returning them to
automatic standby status. In
cogeneration applications, the generator sets are run to serve the
connected load, and heat is also recovered for other uses. Cogeneration power
control switchgear may have additional controls to optimize heat
recovery.
Cogeneration systems often operate in parallel with the utility to
achieve optimum power and heat generation. 
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