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During the midday break, when the sun is at its peak, the photovoltaic panels on the factory rooftop continue to generate electricity at full capacity—power that was previously often wasted. At Zhejiang Guanzheng Valve Co., Ltd., a self-developed energy and carbon management platform has come up with a smart solution: storing the surplus solar power generated at noon for use during production peaks.

The company is one of Wenzhou's newly designated provincial-level green factories. The Zhejiang Provincial Department of Economy and Information Technology recently announced the 2026 list of provincial green factories and green industrial parks. The province newly cultivated 549 provincial-level green factories and 5 green industrial parks. Among them, 71 enterprises in Wenzhou were recognized as provincial green factories, and 1 industrial park was recognized as a provincial green industrial park. According to the relevant person in charge of the Industrial Transformation and Upgrading Division of the Wenzhou Municipal Bureau of Economy and Information Technology, Wenzhou enterprises achieved a 100% pass rate in this provincial green factory application—ranking first in the province—while the number of listed enterprises ranked third in the province, demonstrating simultaneous improvement in both quantity and quality.

Among the 71 enterprises, Zhejiang Guanzheng Valve is a typical small and medium-sized enterprise. The company, deeply engaged in valve manufacturing, primarily serves China's "three major oil companies"—CNOOC, Sinopec, and PetroChina. "In recent years, the three central state-owned enterprises have been advancing green and low-carbon transformation in response to national policies, and as a supplier, we have had no choice but to transform as well," admitted Miao Maole, the person in charge of the company's green factory project. To apply for green factory status, Guanzheng Valve spent five years preparing.

From 2023 to 2025, the company replaced S14-type transformers that were still serviceable with S22-type oil-immersed transformers, installed a cutting fluid reuse system, replaced all diesel forklifts with pure electric forklifts, and in May 2024 collaborated with a Shanghai software company to independently develop an energy and carbon management platform. After more than half a year of commissioning, the platform was officially launched at the end of the year.

"In the past, we only focused on how much the electricity bill was, without knowing which equipment consumed the most power. Now we rely on data," Miao Maole explained. The original intention behind designing the energy and carbon management platform was not simply to "save on electricity bills," but to turn production energy consumption and carbon emissions into data that is "calculable, verifiable, and auditable"—including the product carbon footprint required by downstream customers for green procurement, which is also verified and calculated based on platform data. Unlike the common shortcoming of data lag in peer digital management platforms, this system incorporates an artificial intelligence module that can monitor the power consumption and temperature of each piece of equipment in the factory in real time, automatically identify high-energy-consuming equipment, propose process optimization suggestions, and even recommend phasing out older equipment with low efficiency.

The so-called "green factory" integrates the concept of green manufacturing throughout the entire process of planning, construction, and production operations, achieving low-carbon energy, efficient resource utilization, clean production, green products, and intensive land use—ensuring that every kilowatt-hour of electricity, every drop of water, and every ton of material is "put to its best use." Miao Maole calculated a "green economy account": in 2025, comprehensive energy consumption per unit of output value dropped to 3.73 kgce per 10,000 RMB, a cumulative decrease of 49.4% compared with 2023; photovoltaic power generation accounted for approximately 20%; through the purchase of 1,000 MWh of green certificates, renewable energy electricity consumption reached 100%; after full deduction of green electricity environmental rights, carbon dioxide emissions per unit of output value were zero; the comprehensive utilization rate of general industrial solid waste remained at 100%, and the comprehensive recovery rate of scrapped metal products exceeded 98%. "Although the investment in technical upgrades and equipment is substantial, from the long-term perspective of building a smart factory, it is a deal that does not lose money."

In the view of the relevant person in charge of the Industrial Transformation and Upgrading Division of the Wenzhou Municipal Bureau of Economy and Information Technology, this SME's transformation case has general demonstration significance for the green transformation of Wenzhou's manufacturing industry. "When we first applied for provincial green factories in 2020, we still had to mobilize enterprises to apply. In recent years, more and more enterprises have realized that new quality productive forces are inherently green productive forces, and they are actively applying." To support enterprises, Wenzhou has launched a "combination punch" in the application process: organizing special training sessions on green and low-carbon topics for enterprises and third-party institutions, explaining clearly at the early stage of application "why to create, how to create, and what benefits creation brings," and establishing expert service teams to provide on-site service guidance.

For enterprises, especially those in the electrical and pump-valve industries, provincial green factory status serves as a "yardstick" for measuring compliance management, energy efficiency utilization, and pollution prevention and control capabilities, and can also earn bonus points in bidding and tendering, allowing green investment to translate into visible market returns. Currently, the city has cultivated a total of 167 provincial-level green factories. From "being asked to create" to "wanting to create," this "green account" is moving from policy-driven to enterprise self-motivated.