MNRE Allows ZAM Alloy in Rooftop Solar Mounting Structures Under PM Surya Ghar Scheme
The Ministry of New and Renewable Energy (MNRE) has expanded the list of approved materials for rooftop solar module mounting structures under the PM Surya Ghar scheme by permitting the use of Zinc Aluminium Magnesium (ZAM) alloy.
May 25, 2026. By Mrinmoy Dey
The ministry stated that the decision was taken after receiving requests from industry stakeholders and based on inputs from the National Institute of Solar Energy (NISE). “Based on the inputs received from NISE, it has been decided to also allow use of ZAM for MMS, and accordingly, Annexure 3 of the Guidelines covering Technical Specifications for Rooftop Solar Plants Installed under the Component of ‘CFA to Residential Consumers’ of PMSG: MBY is amended,” stated the MNRE notification.
With the amendment, module mounting structures for rooftop solar systems can now be fabricated using four materials — Hot Dip Galvanised Iron, Aluminium, Hot Dip Galvanised Mild Steel (MS), and ZAM alloy. Earlier, only three materials were permitted: Hot Dip Galvanised Iron, Aluminium, and Hot Dip Galvanised Mild Steel. The ministry has retained its earlier preference for MS in raised structures.
The revised specifications also introduce standards for the newly approved material. According to the amended provisions, ZAM alloy used in MMS must conform to the latest IS 18513:2023 standard. Existing requirements for steel and aluminium structures remain unchanged. Steel MMS must continue to comply with IS 2062:2011 and galvanisation norms under IS 4759, while aluminium structures must conform to AA6063 T6 standards with appropriate corrosion protection through coating or anodization.
MNRE clarified that all other technical conditions related to MMS under Annexure-3 of the rooftop solar guidelines will remain unchanged.
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