The world is installing solar panels faster than it can secure the materials to make them. At the center of that tension is polysilicon — the ultra-pure silicon that sits at the heart of every solar cell — and a single country controls roughly 95% of its global supply.
Now, a government-backed study is pointing to an unlikely candidate to help fill the gap: Australia. With billions of dollars in potential investment and hundreds of jobs on the line, the question is whether a country better known for mining than manufacturing can become a serious force in the solar supply chain.
The material the solar boom depends on
Polysilicon is the foundational material of the modern solar industry. Produced by refining metallurgical silicon into an ultra-pure form, it’s the essential input for every solar cell manufactured today. The process is extraordinarily energy-intensive — requiring approximately 55 kilowatt-hours of electricity per kilogram — which makes it expensive and hard to scale outside regions with cheap, abundant power.
China has mastered that equation. The country accounts for roughly 95% of global polysilicon production, outputting approximately 1.15 million tonnes annually. That concentration represents a structural vulnerability for every country trying to build a domestic solar manufacturing base.
The alternatives are thin. Non-Chinese solar-grade polysilicon comes primarily from Malaysia (around 27,000 tonnes per year), Germany (21,000 tonnes), and the United States (18,000 tonnes). Together, those countries supply just 5% of what China produces. The gap isn’t marginal — it’s foundational.
A supply gap that is growing faster than anyone planned
The problem isn’t static. As solar deployment accelerates and downstream manufacturing expands outside China, the upstream supply of non-Chinese polysilicon is failing to keep pace.
The AusSi Study quantifies that gap directly: a shortage of non-Chinese polysilicon reaching 240,000 tonnes by 2035, then expanding to 350,000 tonnes by 2040. These figures reflect current and announced capacity expansions falling short of projected demand — not worst-case scenarios.
Markets are already pricing in the scarcity. Non-Chinese polysilicon currently commands prices three to five times higher than Chinese material. That premium reflects genuine supply constraints against the traceability, labor, and emissions standards increasingly required by buyers in Europe, North America, and elsewhere.
Policy pressure is redrawing the map
Governments aren’t waiting for markets to self-correct. A wave of trade and regulatory measures is actively reshaping who can sell polysilicon — and at what price — in the world’s largest solar markets.
The United States has moved most aggressively. Section 301 tariffs of 50–60% now apply to Chinese solar imports, supplemented by anti-dumping and countervailing duties. The Uyghur Forced Labour Prevention Act effectively bans polysilicon originating from Xinjiang, a region that has historically supplied a significant share of China’s production inputs.
Europe is arriving at a similar destination by a different route. The EU’s Carbon Border Adjustment Mechanism penalizes embedded carbon in coal-fired polysilicon production, while the Net Zero Industry Act channels subsidies toward suppliers with verified low-emission, traceable supply chains. India has imposed a 20% border duty on modules and cells. Taken together, these measures are creating a distinct premium tier for polysilicon that’s traceable, low-emission, and produced outside China.
Australia’s case: the Hunter Energy Hub
The Australian Silicon Study — backed by the Australian Renewable Energy Agency under its Solar Sunshot Program — examined whether Australia could realistically enter that premium market. According to the study, the answer is yes, under specific conditions.
The proposed facility would sit at the Hunter Energy Hub in New South Wales, already equipped with grid connections, water access, and transport infrastructure. The site falls within a Renewable Energy Zone transitioning away from coal-fired power, aligning the project’s energy needs with the region’s broader industrial shift. That alignment matters more than it might appear: power accounts for over 40% of polysilicon production costs.
The financial picture is substantial. Total capital expenditure is estimated at AU$2.5–3.5 billion, requiring an upfront government grant of AU$1–1.5 billion and production credits of approximately AU$200 million per year over a decade. With that support, the study projects more than AU$1.1 billion in annual economic benefits and 900 high-skilled full-time jobs. At 50,000 tonnes per year, the facility would support roughly 27 gigawatts of annual solar module production, with 90–95% destined for export.
Challenges, competition, and what comes next
None of this is straightforward. Capital costs for building a polysilicon facility in Australia are estimated at two to three times higher than equivalent plants in China, driven by local design standards, construction labor rates, and first-of-a-kind project contingencies. The study’s financial case depends heavily on sustained government support across a long horizon.
Australia isn’t the only country eyeing this opportunity. Quinbrook Infrastructure Partners is separately developing a polysilicon manufacturing facility near Townsville, Queensland, as part of its Northern Quartz Campus project — declared a prescribed project by the Queensland government in 2024 and targeting commercial operations by 2030.
The AusSi Study’s central recommendation is unambiguous: move immediately to the next development phase. Planning, engineering, and funding processes need to begin now if any facility is to be operational in the early 2030s — precisely when the supply gap is projected to start biting hardest. What happens over the next two to three years will likely determine whether Australia becomes a meaningful node in a diversified global solar supply chain, or watches from the sidelines as other nations capture the premium market that policy pressure is creating.
Carlos is an engineer with strong expertise in technical and industrial topics. He previously worked at international companies such as Siemens and speaks Spanish, German, English, and Italian.
