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In a SYNDEM smart grid, all non‐synchronous active participants, both generators and loads, are equipped with the intrinsic synchronization mechanism of synchronous machines. The generators are all turned into frequency‐responsive synchronous participants and can provide (virtual) kinetic balancing inertia to improve frequency stability, in the same way as conventional synchronous machines. This stops the trend of decreasing inertia due to the penetration of DERs. The loads interfaced through power electronic converters also become frequency‐responsive and can automatically respond to the change of frequency, quickly regulating power consumption without impacting user experience. This frequency‐responsive characteristic makes these customer‐side loads play a similar role to PFR on the generator side. It stops the trend of decreasing load damping because of the increasing adoption of loads controlled independently of frequency. See Chapters 5 and 19 for more detail about PFR provided by loads.