From June 1, 2026, India is enforcing a major new domestic-sourcing rule under which "net-metering" and "Open Access" solar projects must use solar PV cells made by manufacturers listed on the ALMM List-II, not just domestically assembled modules. Aimed at cutting import dependence and deepening Atmanirbhar Bharat in clean energy, the mandate has triggered concern that smaller, non-integrated module makers could be squeezed because India's cell capacity (~30 GW) lags far behind its module capacity (~200 GW). This article explains the ALMM framework, List-I vs List-II, the Domestic Content Requirement, net-metering and Open Access, PM Surya Ghar Yojana, the PLI scheme, BCD walls, the overcapacity problem, and the federalism and trade dimensions — everything a UPSC aspirant needs on India's solar manufacturing push.