The Advanced Metering Infrastructure (AMI) represents the cyber backbone of the smart grid, making it highly susceptible to various cyber threats.This research addresses key challenges in AMI transmission networks, including low detection accuracy, model over fitting, and scalability limitations.To mitigate these vulnerabilities, in the proposed model analyses the information to detect and classify instances of resource stealing or anomalous behaviour.The proposed model Ensemble 1D-MN3 employs an integrated 1D CNN and MobileNetV3 architecture with hyper parameter tuning for classification task, which is particularly effective at extracting meaningful one-dimensional features and capturing complex temporal relationships in time-series data.This results in more accurate and reliable detection outcomes.Overall, the implementation of the proposed framework provides a robust and scalable solution for anomaly detection in smart metre data, making it highly suitable for real-world deployment within AMI networks.