50

Coal

Natural Gas

Fig. 3-14 Specific CO2 emissions from different applied power plant technologies as a function of net station efficiency. Source: Siemens Power Corp.

plant and the ability to employ cogeneration cycles often swings life-cycle costs in the favor of on-site prime mover applications. Although centralized systems can employ combined-cycles and other advanced cycles for electric power production, the FCP thermal efficiency comparison always favors cogeneration.

When a facility can use recovered heat for thermal processes, the cogeneration cycle efficiency benefits may shift the life-cycle cost advantage away from the purchased electricity option. When cogeneration cycles can be used for on-site mechanical drive service, the additional benefits of load tracking and avoided electric motor efficiency losses may further improve life-cycle costs relative to purchased electricity options.

cOMPARISON OF oN-SITE eLECTRIC

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