(原始内容存档于2017-06-01) (中文). M.S. Clark, C.R. Huang and S.B. Liu:Development of National Wastewater Tariff Guidelines for China, CDM, 2006, p. 1-2 (页面存档备份,存于互联网档案馆)
August 2019]. Solar power tariff dips to all-time low of Rs 4 per unit. 2016-11-08 [2016-11-10]. SECI lowers the solar tariff to INR 4.43 per unit fixed