Chunghwa System Integration (CSI) is a professional high-tech system integration ICT service company, established by Chunghwa Telecom in Taipei. Professional areas include 5G private network integration solution, audio and video streaming solution, system modernization, professional & digitalize maintenance service, and green energy system integration service. It applies ICT expertise and experience in green energy, such as solar and energy storage system projects, in the hope to move toward ESG.