This paper presents the outline of an optimization program of renewal plans for aged thermal power stations. The program includes technological development of new facilities represented by diminishing construction cost and increasing thermal efficiency as linear functions. It also can include large concentrated repair work maintenance expenditures as well as linear function type ones. It evaluatesthe economic and electro-technical differences of acquiring new sites remote from demand centers against utilizing existing sites with valuable infrastructures.
Examples of application for aged 175, 350, 600MW plants are shown. The study results show that smaller size existing units which can be replaced with advanced combined cycle units with comparatively large output can produce favorable results for promotion of renewal when the ratio of the output after and before renewal is about twice or more.
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