India's solar manufacturing ecosystem remains vulnerable due to import dependence on polysilicon. Discuss the rationale for a dedicated subsidy scheme for polysilicon manufacturing and its likely impact on energy security.

Polysilicon is the purified silicon feedstock at the head of the solar value chain — polysilicon → ingot/wafer → cell → module. India has built large downstream capacity but still imports the bulk of its polysilicon, largely from China, leaving a "deep-end" vulnerability that a dedicated upstream subsidy seeks to close.

Polysilicon → Ingot/Wafer → Cell → Module
   IMPORTED     thin (~2 GW)   growing   surplus
   ↑ policy gap the new scheme targets

Rationale for a dedicated scheme

• Coverage gap in existing PLI: the ₹24,000 crore National Programme on High Efficiency Solar PV Modules incentivises integrated module and cell capacity [1], with Tranche-II awards alone for 39,600 MW [2] — but polysilicon capacity emerging under it is limited, prompting a separate support mechanism [3].
• Prohibitive capital intensity: roughly ₹850 crore per GW for a polysilicon plant with metallurgical-grade silicon, alongside a target of at least 30 GW by 2030 [3]; SPECS offered only 25% capex support, and just one 2 GW ingot-wafer facility has begun operations [5].
• Mandate–supply mismatch: ALMM List-III extends domestic-sourcing mandates to ingots and wafers from 1 June 2028 [4]. Demand-side mandates without upstream supply risk cost escalation — hence a matching supply-side incentive.

Likely impact on energy security

• Import substitution and forex savings, reducing exposure to a single-country supply chain and export-control shocks — the stated import-dependence rationale of solar PLI itself [1].
• Insulates the 500 GW non-fossil target for 2030 from external supply disruption, protecting India's third-largest global renewable capacity position [6].
• Realism needed: polysilicon is energy-intensive with long gestation; benefits accrue only if power tariffs and offtake agreements keep downstream demand firm [3].

A subsidy for polysilicon completes the chain that PLI and ALMM began, converting installed-capacity leadership into genuine manufacturing sovereignty. Sequencing the incentive to mature before the 2028 ALMM deadline, with cheap green power and assured offtake, would let self-reliance in solar reinforce — rather than raise the cost of — India's clean energy transition.