As data centers' energy problems become more serious, it is time to promote independent use of renewable energy. Last October, Google finally announced in a technical session at the OCP Global Summit that AI/ML servers should be operated at ±400V. We have already solved the issues of arc prevention and grounding, which are considered to be challenges, and have a track record of 12 years of actual operation. In this lecture, evangelist Lee Raewon (now 13 years old), who started his own company at the age of 12, will explain the necessity of these direct currents in an easy-to-understand manner, and will also explain these trends and necessity.