According to a previous report published in Shephard Media, the ATLA railgun utilizes five megajoules (MJ), or five million joules (J), of charge energy. It can fire bullets at a speed of around 2,230m/s (Mach 6.5). 20 MJ of charge energy is what ATLA
wants it to run on eventually.
This is the unbelievable part:
Additionally, interceptors can be fired by railguns at varying speeds. Operators can change the rate at which an interceptor moves by manipulating the amount of electrical power used. These choices would be based on how quickly incoming missiles approach.
https://www.eurasiantimes.com/historic-japan-becomes-1st-country-ever-to-fire-electromagnetic/
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