100A in 230V AC single phase is not the same power requirements as 100A for 400V. 

The vicinity transformer will be in medium voltage in 6.6kv, 11kv or even 33kv...so the amperage you are talking above is  peanuts. Obviously grid is designed with certain contingency and future expansion.  

In France, at least the power supply is ok. The only concern is other countries around which produce electricity from very primitive industry. 


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