The sources provide an extensive examination of the critical need for GPS-independent time synchronisation within the modern electrical grid, detailing the vulnerabilities inherent in relying solely on weak satellite signals that are easily susceptible to jamming and spoofing. To enhance resilience and national security, the text thoroughly compares multiple alternative timing solutions, including leveraging Multi-GNSS (like Galileo), deploying earth-based radio systems such as eLoran, and implementing Precision Time Protocol (PTP) over fibre optic networks. The document advocates for a multi-layered strategy—a “triade” of independent sources—citing China’s successful integration of satellites, eLoran, and fibre optics as a practical model for achieving robust infrastructure independence. Ultimately, the sources conclude that transitioning to a fully independent synchronisation system is both technically feasible and socioeconomically prudent, although full national implementation is projected to take several years.