JEE_V3_N4_A1 G. Srinivasulu B. Subramanyam Journal on Electrical Engineering 2230 – 7176 3 4 1 7 Transmission Expansion Planning, Indian Power System, Deregulated Environment, PLEXOS and SDDP Model Transmission expansion planning in India has moved from earlier generation evacuation system planning to integrate system planning. With massive capacity addition coupled with deregulation of power sector has thrown huge challenges for transporting the power. With power exchanges in India in their infancy and thrust towards renewable energy resources India provides a challenging opportunity for transmission expansion planning. In this paper we have reviewed two of most commonly used models plexos and SDDP and their suitability of application for Indian power system. April - June 2010 Copyright © 2010 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1165