Abstract: The power system is facing a paradox of simultaneous requirements on the security, low carbon and efficiency. Conventional modes of ensuring the security with redundancy cause a large amount of inefficient investment and operations, which cannot meet the requirements of high-quality development of power systems. Accommodating curtailed renewable generation by suppressing the output of thermal units will result in higher external costs, which goes against the expectation of economic efficiency. To crack the paradox of security, low carbon and efficiency, the high-elastic power grid enabled by the energy internet provides a solution. This paper explained the concept, characteristics and physical form of the multi-factor integrated high-elastic power grid in the energy internet, and analyzed the significance of the high-elastic power grid, and hinted new theory, method and technology that support the development of the high-elastic power grid. The performance evaluation indices and illustrative pilots of the high-elastic power grid are also introduced.