The 220MW Public Service of Oklahoma Comanche Station PACE (Power at Combined Efficiency) combined cycle power plant located in Lawton, Oklahoma underwent a major upgrade and life extension during 1985–1986. Prior to committing the project, an extensive study was performed to quantify and evaluate the effects of the project on the PSO system and its impact on PSO’s long-term goal of providing quality, economical service to its customers. This paper presents techniques used to assess these effects (generically) on a utility system and determine the benefits to both consumers and investors. This information is presented in such a form that it may be used as a guide to perform similar studies of plant upgrades and modernizations.

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