Guangzhou may not be so bright in future if a plan to turn off decorative lighting due to electricity shortages goes ahead. Local power authorities had proposed cutting electricity supply to the energy-hungry 'bright-light scheme' to ease the growing gap between consumption and supply, the Information Times reported. An official at the Guangzhou Power Supply Company said the lighting scheme used 18,000kWh of power a day, accounting for 70 per cent of the main city area's electricity. The scheme, common in many mainland cities, has illuminated many of Guangzhou's tall buildings since the Lunar New Year. According to the supply company, the daily gap between electricity consumption and supply in Guangzhou is between 500,000 and 600,000kWh. The official was quoted as saying that the lighting scheme was important for the city's image, but officials were running out of options amid the growing power shortage. 'People usually take the luminous 'bright-light scheme' as an indication of the electricity supply situation of a city,' the official said. 'For a cosmopolitan city like Guangzhou, turning off lights would have a significant impact. But if the scheme is not to be limited, what else can be done to ration electricity?' Setting an example, the Guangzhou power company has had all decorative lights at its headquarters turned off since March 12. Guangzhou authorities started rationing electricity in January, six months earlier than the previous year, the report said. Electricity shortages have been an acute problem, with widespread cuts in big cities since last year. Xinhua has reported the mainland will continue to face serious energy shortages in the next 20 years. Fast-growing Guangdong has been one of the areas hit hardest by the energy shortage.