10

Figure 23-6 depicts the operation of an electric cogener-ation system with a full-load capacity that can meet 75% of the facility's peak electric demand. The system operates at full capacity for 10 hours per day on weekdays and tracks the facility's demand for 6 hours per day. The system is shut down overnight due to the combination of low electricity cost in the off-peak period and low thermal requirements. This strategy of dynamic operation depending upon hourly economic considerations is often referred to as economic dispatch.

Fig. 23-4 On-Site Power Production vs. Purchased Power for Electrically Baseloaded Plant.

Internal-Use Generation vs. Power Exportation

Internal-use electric generation is the simplest and most economical generation strategy. Systems designed for

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