GREW Solar has signed a five-year commercialisation partnership with California-based Caelux Corporation to produce 4 gigawatts (GW) of hybrid-tandem solar modules, bringing perovskite technology closer to large-scale manufacturing in India from 2028.
The modules will combine Caelux’s perovskite-based energy-producing glass with GREW Solar’s n-type tunnel oxide passivated contact (TOPCon) technology. The companies said the design will use two energy-producing layers and achieve efficiencies of more than 29 per cent.
The agreement expands Caelux’s contracted volume with solar module manufacturers globally to 19 GW, according to the companies. GREW Solar plans to use the technology in its large-format G12R series as part of the partnership.
Perovskite is being developed as an additional power-generating layer for conventional silicon solar modules. Caelux’s proprietary system converts the top glass of a solar module into a second generation layer. The company said its technology can increase energy density by up to 30 per cent and improve the levelised cost of electricity by 20 per cent or more.
Commercial production is targeted for 2028. The planned modules are also intended to meet the eligibility requirements of India’s Approved List of Module Manufacturers, or ALMM. The list is a key requirement for modules used in several government-linked solar projects and schemes, making domestic manufacturing eligibility an important part of the companies’ commercial plans.
The partnership links an emerging module technology with GREW Solar’s expanding manufacturing footprint. The company operates a 6.5 GW solar photovoltaic module facility in Dudu, Rajasthan, and plans to increase its module manufacturing capacity to 11 GW.
GREW Solar is also establishing an 8 GW solar photovoltaic cell manufacturing facility in Narmadapuram, Madhya Pradesh. Its 8 GW wafer and ingot production lines are under construction, according to the company information cited in the announcement.
The manufacturing expansion reflects the growing effort to build a fuller solar equipment supply chain within India, extending beyond module assembly to cells, wafers and ingots. In this context, the partnership’s significance lies not only in the proposed efficiency gain but also in whether advanced module technology can be integrated into a domestic production network at commercial scale.
The companies have not disclosed the investment value, manufacturing location, production schedule beyond the 2028 target, or the expected capacity allocation between GREW Solar’s existing and planned facilities. They also have not provided details of the projects or customers that will use the modules.
For solar developers and electricity planners, higher energy density could affect the amount of electricity generated from a given project footprint. However, the commercial impact will depend on production costs, module durability, supply-chain readiness and successful compliance with ALMM requirements. The next stated milestone is commercial production of the perovskite-plus-silicon modules in 2028.
