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A key part of implementing Volt-VAR control and optimization is to identify the benefits that can be attributed to VVO. The major challenge is to separate the impacts of VVO (i.e. the VVO benefits) from the impacts of factors not related to VVO, such as changing weather conditions, random customer behavior and routine operational changes (planned switching). Utilities on the panel have performed VVO measurement and verification using different methods. Each presenter will describe how the method works, data requirements, strengths and weaknesses of the approach and results. The session also will summarize work by the IEEE Volt-VAR task force to develop IEEE Guideline P1885 M&V of VVO projects for electric distribution utilities.