The smart grid provides a flexible interactive platform for energy stakeholders by sharing energy usage data to enhance management efficiency and service accuracy. However, such data are often highly sensitive and vulnerable to eavesdropping and tampering during transmission. Ensuring data authenticity, integrity and users’ privacy is therefore critical. Redactable signatures have emerged as a promising cryptographic primitive to address these concerns. Nonetheless, most existing redactable signature schemes lack fine-grained control over the redaction process, making them susceptible to unauthorized or malicious modifications. To address this issue, we propose an identity-based Controlled Redactable Signature Scheme (CRSS), enabling users to selectively disclose information under controlled conditions without revealing private information. We define a formal security model and prove that the proposed scheme achieves unforgeability, redaction controllability, privacy, and transparency. Furthermore, theoretical analysis and experimental evaluation demonstrate that our scheme offers superior efficiency and practicality compared to existing approaches.