Gas turbine cogeneration has probably experienced the most rapid development in recent
years due to the greater availability of natural gas, rapid progress in the technology,
significant reduction in installation costs, and better environmental performance.
Furthermore, the gestation period for developing a project is shorter and the equipment can
be delivered in a modular manner. Gas turbines have a short start-up time and provide the
flexibility of intermittent operation. Though they have a low heat to power conversion
efficiency, more heat can be recovered at higher temperatures. If the heat output is less than
that required by the user, it is possible to have supplementary natural gas firing by mixing
additional fuel to the oxygen-rich exhaust gas to boost the thermal output more efficiently.