India can now assemble more solar modules in a year than almost any country outside China. What it can’t yet do, at meaningful scale, is make the raw materials that go into those modules. Understanding exactly where the gaps sit in the five-stage solar value chain — and why they matter for procurement risk — is essential context for anyone sourcing solar equipment in India today.

Quick Answer

Solar manufacturing runs through five sequential stages: polysilicon refining, ingot growth, wafer slicing, cell manufacturing, and module assembly. India has built substantial capacity at the downstream module stage (~200 GW) but remains heavily import-dependent at every upstream stage — nearly all of India’s polysilicon requirements continue to be imported, and wafer imports also remain overwhelmingly dependent on China. This “inverted pyramid” — strong downstream capacity, weak upstream capacity — is the structural reason behind ALMM List-II, the coming ALMM List-III for wafers, and the cell supply constraints EPCs are navigating through 2026.

The Five Stages of Solar Manufacturing

Why the Chain Is So Lopsided

Despite reaching a nominal module capacity of 172 GW by Q1 2026, India’s local supply chain exhibits an asymmetrical, “inverted pyramid” structure, with upstream and midstream capacities lagging severely behind downstream assembly. The reasons compound at each stage moving upstream:

Capital intensity increases sharply. Module assembly is comparatively capital-light and can be commissioned relatively quickly. Cell manufacturing requires significantly more specialised equipment and process expertise. Wafer and ingot production, and especially polysilicon refining, require enormous capital investment, longer commissioning timelines, and highly specialised technical know-how that India has historically had limited domestic experience with.

China’s structural dominance compounds the gap. China accounts for over 80 percent of global manufacturing capacity across the solar value chain, while controlling more than 95 percent of global wafer production, and Chinese manufacturers continue to dictate global supply and pricing in polysilicon specifically. Globally, the solar PV manufacturing supply chain is dominated by China, with over 90 percent share in polysilicon and wafer manufacturing capacity, over 85 percent share in cells, and around 80 percent share in modules. New entrants at any upstream stage are competing against an incumbent with two decades of accumulated scale economics.

Policy incentives arrived downstream-first. India’s manufacturing-linked incentive schemes and the original ALMM List-I framework targeted module manufacturing years before equivalent structural support existed for cells, wafers, or polysilicon — which is a large part of why capacity built up in that order.

The Momentum Building Upstream

The picture is not static. FY25 marked an important structural milestone with the commissioning of India’s first ingot and wafer manufacturing facility, with an initial capacity of 2 GW, and the country is at the cusp of commencing domestic polysilicon production, with major fully integrated manufacturing facilities expected to come online between FY26 and FY28. Several large players — including Tata Power, Adani Solar, and Waaree — have announced plans to set up ingot and wafer manufacturing capacities in phases.

Policy is following the same upstream trajectory. Beyond ALMM List-II for cells, MNRE expanded the ALMM framework in March 2026 to include solar ingots and wafers under a new ALMM List-III, effective from June 1, 2028  — with the explicit intent of pulling backward integration investment upstream the same way List-I and List-II did for modules and cells.

Some manufacturers are moving proactively rather than waiting for the mandate. Websol Energy System, for instance, has outlined its own backward-integration roadmap toward ingot and wafer production — details of which are covered in our dedicated piece on Websol’s backward integration strategy.

What the Gap Means for EPCs and Developers Right Now

Cell-stage risk is the most immediate and practical concern. Domestic cell manufacturing currently meets only about 25–30 percent of demand, resulting in a sizeable gap in the upstream value chain  — this is the layer most likely to directly affect your project timelines today. We’ve covered this specific risk, and how to plan around it, in India’s solar cell supply crunch.

Wafer-stage exposure is a medium-term consideration. With ALMM List-III not mandatory until June 2028, wafer sourcing isn’t yet a compliance issue — but manufacturers who are building supplier relationships now, ahead of the mandate, will be better positioned when it activates. MNRE has indicated it will only publish ALMM List-III once at least three independent wafer manufacturers are operational in India with combined capacity of 15 GW per annum — a threshold that itself signals how early-stage this segment of the supply chain remains.

Polysilicon-stage exposure is largely indirect but still relevant to pricing. As the input furthest upstream, polysilicon supply and pricing dynamics (heavily influenced by Chinese production economics) flow through the entire chain and eventually affect wafer, cell, and module pricing even for buyers who never interact with polysilicon suppliers directly.

Why Vertical Integration Is Becoming a Genuine Differentiator

In a supply chain this lopsided, a manufacturer’s position on the value chain map is a legitimate procurement consideration, not just a corporate narrative point. A company manufacturing its own cells — rather than depending on third-party cell supply in a capacity-constrained market — removes an entire layer of upstream risk exposure that pure module assemblers currently carry.

Websol Energy System Limited operates at the cell and module manufacturing stages, producing its own M10 Bifacial Mono-PERC cells rather than depending on external cell supply, with additional backward-integration plans extending toward ingot and wafer manufacturing. Current product specifications are available on the Websol solar cell page and solar module page.