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This paper investigates the problem of electricity theft attacks in the generation domain. In this attack, the adversaries aim to manipulate readings to claim higher energy injected into the grid for overcharging utility companies by hacking smart meters monitoring renewable-based distributed generation. In prior research, deep learning (DL) based detectors were developed to detect such behavior, though they relied on different data sources and overlooked the critical impact of small perturbations which an attacker could integrate into its reported energy. This paper takes advantage of addressing this gap by proposing an efficient DL-based detector that can offer much higher accuracy and detection rate using only a single source of data by adding two features to enhance the performance. Subsequently, the proposed detector is further extended to cope with the small perturbations that attackers can add. We carry out …