The 2018 manufacturing capacity of solar cells and solar modules in India was 1,590 MW and 5,620 MW, respectively. Except for crystalline silicon wafers or cadmium telluride photovoltaics or Float-zone silicon, nearly 80 percent of solar-panel weight is flat glass. 100-150 tons of flat glass is used to manufacture a MW of solar panels. Low-iron flat or float glass is manufactured from soda ash and iron-free silica. Soda-ash manufacturing from common salt is an energy-intensive process if it is not extracted from soda lakes or glasswort cultivation in alkali soil. To increase installation of photovoltaic solar-power plants, the production of flat glass and its raw materials must expand commensurately to eliminate supply constraints or future imports.