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This paper presents an application of an online self-organizing fuzzy-logic controller to a boiler-turbine system of a fossil power plant. The control rules and the membership functions of the proposed fuzzy logic controller are generated automatically without using plant model. A boiler-turbine system is described as a multi-input multi-output (MIMO) nonlinear system in this paper. Three single-loop fuzzy-logic controllers are designed independently. Simulation shows robust results for various kinds of electric load demand changes and parameter variations of boiler-turbine system.