The smart grid is a modern power grid infrastructure. As the power information integrates into Internet, it raises a challenge on security which threats the power system. To ensure the security of sensitive clouding data of electric power system, the straightforward approach is to encrypt such sensitive data. However, traditional cryptographic methods will cause the cipher-text difficult to be efficiently queried. Particularly, it becomes more difficult to deploy such scheme for mobile devices in smart grid, considering that they are usually computation-limited and storage-limited. In this paper, based on the existing schemes for searchable encryption on clouding database, we proposed an efficient, secure, and scalable scheme to address this challenge issue. The performance evaluation and security analysis demonstrate the validity and practicality of the proposed scheme.