With the COP26 global climate summit being seen as one of the last chances for the planet, SCMP China desk reporter Holly Chik looks at how China's ongoing power crisis has lead to a huge shake-up in its economy and opened the way for renewable energy to compete against coal. Norway-based energy analyst Qin Yan contrasts the operation of China's new national emissions trading market with that of Europe, how changes in China's energy market are a tectonic change for its economy. China energy…