How many grid companies or power companies are there in China?

Power groups (companies) mainly include: \ x0d \ State Grid Corporation \ x0d \ China Southern Power Grid Co., Ltd. \ x0d \ China Huaneng Group Corporation \ x0d \ China Datang Corporation \ x0d \ china huadian corporation \ x0d \ China State Grid Corporation \ x0d \ China Power Investment Corporation. X0d \ China Hydropower Engineering Consulting Group Company X0d \ China Water Conservancy and Hydropower Construction Group Company X0d \ China Gezhouba Group Company