Delayed coal shipments, the normal winter decline in hydropower capacity, and ice damage to transmission systems have all contributed to cuts in power output, just as the cold weather has driven up demand.

• 电煤的供应受阻，加上冬季的电力产能本来就少，电力传输网再遭冰雪破坏，随着冬季用电量的攀升，国家不得不采取临时限电和断电的措施。