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o J II J Iiie Integral Project scheduling issues must be considered. These models either will be directly incorporated into the DSS as resident models or will exchange data/results with the DSSas non-resident models. The INTEGRAL system will be generalized for use by a variety of electric utilities and water resource agencies. The decision support and modeling systems should improve the coordination between reservoir and power operations, facilitate the consideration of environmental concerns in power scheduling and planning, and enhance decision making. INTEGRAL is currently planned as a four-year project. The project commenced in 1992, and the INTEGRAL system should be operational for the TV A system by the end of 1995. Decision Support System A Decision Support System is an integrated suite of hardware and software organized around a common data architecture (see Figure I). DSS software can consist of models, data, analysis tools, and visualization aids which help the user identify a problem, evaluate options, arrive at a solution, and communicate results to other locations. The DSS provides a consistent set of displays and graphical controls to facilitate the decision making process. TV A is working with the University of Colorado Center for Advanced Decision Support for Water and Environmental Systems (CADSWES) to plan, design, and implement the DSS (CADSWES, 1993). The DSS, as tailored to the TV A system, is referred to as the TV A Environment and River Resource Aid (TERRA). TERRA will run on individual workstations networked over a corporate-wide area network. These workstations will be located at primary decision making centers to facilitate communication and data sharing between TVA's power control center, power supply staff, reservoir operations center, water quality staff, and technical support staff. The overall database architecture, communication framework, access to models, generic analysis tools, and user interface of TERRA will be designed to allow tailoring of the general DSS framework to the specific needs of other utilities. TV A and CADSWES will work with a second utility to demonstrate the applicability of the DSS framework to an alternative power and reservoir system. Integrated Modeling System The Integrated Modeling System described in this report is an important constituent of the DSS. The purpose of the modeling system is to support the scheduling, forecasting, and planning functions of the DSS. The development of the modeling system, however, is being treated as a separate project component because there are a number of issues that must be addressed regarding which models to incorporate into the system, model development needs, 2-2