BEIJING – China has published a significantly stricter mandatory energy consumption standard for polysilicon production, lowering the maximum allowable energy use for existing rod-silicon plants and tightening accounting rules in a move that could reshape the country's solar manufacturing landscape. The revised standard, effective January 1, 2027, represents Beijing's latest and most aggressive policy intervention to curb overcapacity in the photovoltaic sector-an industry that has been plagued by chronic oversupply, collapsing prices, and mounting financial losses among producers.
Three Standards, One Unified Framework
The State Administration for Market Regulation and the Standardization Administration of China collaborated to issue three mandatory national standards which govern energy consumption and efficiency in photovoltaic production along the entire manufacturing chain on June 27, 2026. The documents became available for the public on July 22. The enforcement of the rules in effect will start on January 1, 2027. The following areas of production are covered by the standards: polysilicon and germanium production (GB 29447-2026), monocrystalline silicon production (GB 47835-2026), and crystalline silicon modules and inverters' efficiency (GB 47834-2026).
In contrast to earlier non-binding recommendations used in the industry, the standards are binding according to the Standardization Law of China. Products and services not meeting the Grade 3 standard requirements cannot be produced, sold, imported, or provided in China.
A Significant Tightening from the Draft
The most significant changes appear in GB 29447-2026, which replaces the existing GB 29447-2022 standard. For polysilicon produced through the trichlorosilane (Siemens) process-the dominant technology for rod silicon-the three energy consumption grades are set at 5.0, 5.5, and 6.3 kilograms of standard coal equivalent (kgce) per kilogram of product. The Grade 3 limit, which represents the maximum allowable energy consumption for existing production, has been tightened from 6.4 kgce/kg in the September 2025 consultation draft.
For silane fluidized-bed production, used primarily to manufacture granular silicon, the Grade 1, Grade 2, and Grade 3 limits are 3.6, 4.0, and 4.6 kgce/kg, respectively-a substantial reduction from the proposed 5.0 kgce/kg threshold in the draft. These revisions exceeded earlier market expectations.
The tightening is even more dramatic when compared with the current standard (GB 29447-2022, effective since January 2024), which classified polysilicon energy consumption at ≤7.5 kgce/kg for Grade 1, ≤8.5 kgce/kg for Grade 2, and ≤10.5 kgce/kg for Grade 3. The Grade 3 threshold has been slashed by nearly 40%.
The standard also tightens accounting rules for externally sourced silicon cores and hydrogen, reducing the scope for producers to lower reported energy consumption through differences in calculation boundaries.
Capacity Implications: From 3.5 Million Tonnes to Under 2 Million
The revisions could have profound implications for China's polysilicon supply base. An industry estimate cited after a standards implementation meeting suggested that around 84% of existing rod-silicon capacity could meet the draft 6.4 kgce/kg threshold, but only about 45% could comply with the final 6.3 kgce/kg limit. Put differently: without retrofitting, more than half of China's polysilicon capacity would fail to meet the new mandatory standard.
Brokerage estimates suggest that the standard could reduce China's compliant polysilicon capacity from around 3.5 million tonnes to less than 2 million tonnes. That would remove more than 1.5 million tonnes from the compliant capacity pool, compared with estimated demand of about 1.5 million tonnes in 2027. According to the Silicon Branch of the China Nonferrous Metals Industry Association, preliminary estimates indicate that following the adjustment of energy standards, China's effective polysilicon output could decline by 31.4% from current total capacity.
However, the immediate impact on supply may be more limited. Much of the higher-energy production capacity is already idle, while operating polysilicon capacity stood at around 1.3 million tonnes during the first half of 2026. As of mid-2026, the industry's capacity utilization rate remained below 40%. Non-compliant facilities will also have a grace period to improve performance through measures such as heat recovery, process optimization, and other technical upgrades. Industry observers suggest that final permanent capacity shutdowns may ultimately account for 20% to 25% of total capacity, with more than 60% of that being long-idle capacity.
Industry Response and Market Implications
Industry responses have varied. Some in the market raise doubts about the real use of the development, stating that it would be sufficient to implement process optimization to achieve the necessary energy savings. Nevertheless, one of the manufacturers warned that although such methods may help to decrease energy use, product quality could suffer, which could have a negative effect on its acceptance by the market as well as its competitiveness.
A polysilicon industry source told OPIS that if the standards are strictly enforced, only production facilities commissioned after around 2018 would generally be capable of meeting the new energy consumption requirements. However, because China's rapid polysilicon capacity expansion largely occurred after 2020, much of the newer capacity is already relatively efficient.
The standards may also reshape procurement practices. State-owned utilities, government-backed renewable energy projects, and centralized tenders are expected to adopt the new limits as entry requirements or scoring criteria. This could shift demand toward higher-efficiency, lower-energy products, reducing the space for low-price, low-performance offerings in the market.
A Structural Shift, Not a Quick Fix
While the new standards will undoubtedly accelerate the phase-out of inefficient capacity, several sources caution that the standards alone are unlikely to materially rebalance market fundamentals in the near term. The industry still faces significant challenges: operating capacity remains far below installed capacity, and any supply-side reduction could be partially offset by producers who successfully retrofit their facilities.
The standards signify a change in the way China's solar manufacturing market is run, moving from a system driven by expanding operations to one focused on efficiency, quality, and energy performance. The fact that this industry is responsible for over 80% of global polysilicon output means these developments will have far-reaching effects and bring about changes in prices, supply chains, and speed of global energy transition.
