Corrections & clarifications | South China Morning Post
  • Sun
  • Feb 1, 2015
  • Updated: 4:58pm

Corrections & clarifications

PUBLISHED : Wednesday, 16 September, 2009, 12:00am
UPDATED : Wednesday, 16 September, 2009, 12:00am

Due to a miscalculation in Wednesday's report 'Dirty reality behind solar power' on page A1, the amount of coal needed to produce a one-square-metre solar panel was misstated as 40kg; the correct amount is 260kg. Other calculations should have been made clearer. A solar panel in Guiyang can be charged at peak rates for only an average of 2.8 hours a day; in addition, much of the energy generated will be lost during the process of conversion and storage. Hence two one-square-metre panels, with a combined capacity of 260 watts and requiring 520kg of coal to manufacture, would be needed to power a 22-watt LED street lamp for 12 hours a day in Guiyang. The coal-electricity conversion rate of a mid-sized power plant in China is 374g/kwh in 2005, according to the Chinese Academy of Social Sciences. So 520kg of coal would be able to generate enough power to run a 22-watt LED street lamp for 12 hours a day for 14 years, not 30 years as stated in the article. The article also incorrectly stated that a solar panel with a capacity of one kilowatt would generate enough energy to keep a fridge cool for a day; it should be able to run the fridge continuously in a city like Guiyang.


For unlimited access to: SCMP Tablet Edition SCMP Mobile Edition 10-year news archive



Login Account