Dynamic Line Ratings based on thermal limit increases utilization of existing transmission line network. The excess capacity can be used to alleviate congestion, which has positive ramification on system. The computational complexity of dispatch problem increases as temperature and current are related through set of differential equations. Hence, a temporal decomposition based multi-interval ACOPF incorporating dynamic line ratings is proposed to manage strict computational requirements in real time dispatch. The method is tested on 4 bus system and application based on congestion management during real time dispatch and improvement in utilization of wind power based system is proposed. © 2020 IEEE