I don't understand how this would kill billions? Would people in cities go feral without power for a period of 2-3 months? Yes. Would rural people live off the land a bit, roughly approximating the lifestyle of the great depression for a quarter? Yes. Would those with valuable skills become priceless resources while do-nothing jobs become immediately worthless and long-term strongly depreciated. Yes.
All critical broken technology would be repaired in 6 months and all non-essential technology would be repaired or replaced in 3-5 years. Shortages would feel similar to Covid, but we'd have immediate deregulation to move goods and services to the point of need with zero bureaucracy.
Exception of people in hospitals that may perish due to lack of lifesaving resources, and the inability to pump water to arrest fires, I don't see so much downside in a global values correction?
Everything the global population presently values will become worthless. Neighbors, Family, Faith, and Self-Reliance will become a cornerstone of all societies all at once. I suspect gender pro-nouns and only-fans will quickly go out of fashion!