Because of power shortages, Shanghai is ordering some heavy industry to work nights, according to The Guardian newspaper. Shanghai will shut down the most intensive energy users – small metal, steel-alloy, and calcium carbide workshops – and make its power-intensive industries switch production to a nightshift from midnight to 8am. Located just south of the Yangtze, Shanghai is considered too temperate to justify communal heating schemes for apartment blocks or houses, but with temperatures falling to as low as zero during the winter, many homes and businesses can now afford to buy their own electric heaters. China was a net exporter of energy for three decades, but its economic growth has far outstripped domestic production of oil and gas.