And that's a big problem with today's distribution systems.The 50KW number comes from 200 Amp service. 220v x 200 A = ? around 50KW
It was in an article I read about charging the new electric vehicles - Their fast charge mode (available at dedicated multiple car charging stations) exceeds a modern house's 50KW service.
A decade ago, service drops and transformers were sized using a "diversity factor".
In a nutshell, things(secondary conductors and transformers) were designed at an overload factor of 1.25. If the transformer fed more than one meter.
Theory was, 4 houses on one transformer, all 4 air conditioners would never come on at once.
Problem with new "digital" thermostats. If the power has been off, every transformer on the circuit will energize at once. Every air conditioner will try to start at once.
That is an impossible cold load pickup to endure.
Old school mercury thermostats or apportioned delays on the digital thermostats is the only answer.