The North American Electric Reliability Corporation (NERC) discussed a proposed experiment that would relax frequency regulation requirements. https://www.nerc.com/pa/Stand/Project%2020101422%20Phase%202...
Was that made permanent, or reverted? I thought I've noticed the accuracy of my older line clock being worse... trending fast.
From https://en.wikipedia.org/wiki/Utility_frequency#US_regulatio...