A meteorologist used a computer program to calculate that a butterfly flapping its wings in Brazil will lead to a tornado in Texas one month later. Practically, there are a lot of things that happened during the long route and they group together to enlarge the effect.
Australia requested China to disclose the original data of Covid-19. China refused and started sanctions on Australian goods. Coal is one the major items and thus coal prices started to soar up which made the cost of electricity soar up also. Indonesia can also supply part of the coals, but their quality is lower and needs to have more coal for electricity generation. China at the same time banned a lot of dangerous coal mines and thus aroused shortage. Moreover, the electricity demand is higher because of the Covid-19 explosion in India and Vietnam that factory orders shifted back to China. In summer, a nuclear plant in Taishan of South China stopped running for maintenance is also one of the reasons.