The Bureau of Indian Standards (BIS) has published new regulations on all-glass evacuated solar collector tubes and related storage tanks of non-concentrating solar collector systems. Indian Standard (IS) 16542 : 2016 describes the storage tank’s specifications, IS 16543 : 2016 names the ones for tubes, and IS 16544 : 2016 covers the ones for complete systems. To obtain the three new standards, a company or individual will have to purchase them at BIS. Once the government notification has been published, all three will become mandatory and require that each tube or storage tank should carry the standard’s mark in addition to the manufacturer’s trademark and the batch number or date of manufacture. A transition period is to be set by the Ministry of New and Renewable Energy (MNRE). The photo shows vacuum tube systems on the roof of a block of flats in Kolkata city in eastern India.