Top 5 Countries Leading Green Patent Filings

Green patent filings are surging as countries push for cleaner technologies to combat climate change. In 2025, global green patent filings grew by 20%, making up 12% of all patent applications. This growth is driven by falling costs in renewable energy tech, government incentives, and fast-track patent programs.

Here are the top 5 countries driving this momentum:

• China: Leads in total filings with 73,718 international applications in 2025. Dominates energy storage, solar, and hydrogen patents, utilizing AI-enabled patent analysis to track these landscapes.

• United States: Focuses on high-value patents, with strong growth in AI-driven sustainability and battery tech.

• Japan: Excels in international patent families and secondary batteries, with a focus on energy-saving and solar technologies.

• Germany: A leader in clean transport and renewable energy, with strong contributions from its automotive and industrial sectors.

• European Union (France & Denmark): France leads in volume, while Denmark excels in wind energy patents per capita.

These nations are shaping the future of green innovation, each with unique strengths in renewable energy, clean transportation, and energy-efficient technologies.

Top 5 Countries Leading Green Patent Filings: Key Statistics and Technology Focus

1. China

Volume of Green Patent Filings

China is setting the pace in green patent filings on a global scale. In 2024, the country secured 53,000 invention patents in the green and low-carbon sector - an impressive doubling of its 2020 numbers. Between 2021 and 2025, the annual growth rate for patent filings reached 19.2%, and published applications saw a 20% increase in 2023.

This rapid growth places China well ahead of its global competitors. In 2023 alone, the country published 101,000 green and low-carbon patent applications - nearly five times more than Japan, which ranked second. Additionally, Chinese residents filed 4,977 patents per $100 billion of GDP in 2024, the highest ratio worldwide. Liang Xinxin, an official at the China National Intellectual Property Administration (CNIPA), highlighted this achievement:

"China's innovation in green and low-carbon technologies has emerged as a major driving force in advancing global development in the field".

Key Technology Sectors Driving Green Patents

Energy storage has become the fastest-growing green tech sector in China, with 37,000 patent applications in 2023, accounting for 48% of the global volume. This sector grew at an average annual rate of 19.3% and surpassed energy-saving and recycling technologies to become the leading field for new applications in 2023. Clean energy technologies also remain a strong focus, with China leading the world in solar energy (8,000 invention patent applications) and hydrogen energy (5,000 applications) in 2023.

Among the key players driving this innovation are Contemporary Amperex Technology Co. (CATL), which filed 5,738 patents, State Grid Corporation with 5,569 filings, and China Southern Power Grid contributing 2,285 filings in 2023.

Global and Regional Impact on Sustainable Innovation

China’s dominance in green patents significantly influences sustainable innovation worldwide. Between 2016 and 2023, the country published 555,000 green patent applications globally, which is nearly three times Japan's total (200,000) and far surpasses the U.S. (157,000). Moreover, Chinese enterprises have shared 12,000 green technology solutions through the WIPO GREEN platform to further climate action. In 2024, China filed 6,356 PCT applications in green and low-carbon technologies, marking a 130% increase from 2020.

These numbers highlight China's critical role in driving sustainable innovation on a global scale.

2. United States

Volume of Green Patent Filings

The United States ranks second globally in total patent filings, just behind China. In 2024, the United States Patent and Trademark Office (USPTO) processed 603,194 patent applications, reflecting a modest 0.8% increase from the prior year. However, this upward trend reversed in 2025, with total applications dropping by 9%, marking the lowest level since 2019. Despite this, U.S. applicants maintained a strong global presence, filing 231,536 applications abroad in 2024, highlighting a clear focus on international markets.

Even with the domestic decline, U.S. companies achieved 136,131 patent grants in 2025, the highest for any single country. Between 2020 and 2021, the U.S. was responsible for 20.6% of the world's foreign-oriented patent families, underscoring its commitment to safeguarding major innovations on a global scale. These numbers reflect the country’s emphasis on developing patents with significant commercial and strategic impact.

Quality and Innovation Focus of Patents

Patents originating in the U.S. are often regarded for their high citation rates and commercial relevance. This is partly due to the considerable costs and strategic planning involved in international filings. In 2024, the USPTO received approximately 333,000 applications from non-residents, more than double the number received by China.

American companies also accounted for 47.1% of global R&D spending among the top 2,000 investors worldwide in 2024. This substantial investment directly fuels cutting-edge advancements, especially in areas like AI-driven sustainability solutions. For instance, AI-related patent grants rose to 54,022 in 2024, reflecting a 56% increase since 2020.

Key Technology Sectors Driving Green Patents

Sustainability has emerged as a key focus for U.S. research and development efforts. Among the fastest-growing technology areas in 2025, five out of the top ten were tied to batteries or processes for green hydrogen production. Battery technology grew 16% in 2024, while green hydrogen processes saw an impressive 23% growth between 2021 and 2025.

The automotive sector is at the forefront of green innovation, with significant advancements in reducing greenhouse gas emissions, manufacturing secondary battery cells, fuel cell technology, and electric propulsion systems. Additionally, the circular economy is gaining traction, with patents focusing on waste recovery and reclaiming non-ferrous metals from scrap materials. Lily Iacurci, Marketing Manager at IFI CLAIMS Patent Services, commented:

"Today, the applications are signaling toward ways to increase energy diversification and decrease strain on the environment".

These developments highlight the U.S. as a leader in driving sustainability-focused innovation forward.

Global and Regional Impact on Sustainable Innovation

The U.S. produces over 1,500 TWh of renewable energy annually, making it the second-largest producer globally. Its influence in sustainable technology extends internationally, supported by robust patent protections. However, recent policy shifts could pose challenges. The termination of the USPTO Climate Change Mitigation Pilot program in 2025 and the cancellation of nearly $8 billion in climate-related funding from the 2026 budget may hinder future domestic progress.

Private sector initiatives and state-level policies continue to drive innovation. For example, Texas leads in wind energy production, while California dominates solar energy efforts. Universities also play a pivotal role, with the University of California system securing 1,441 patents in 2024, fostering early-stage sustainable technologies. Interestingly, some companies are opting to protect green innovations, particularly in AI-driven sectors, as trade secrets rather than patents. Ron Kratz, CEO of IFI Claims, explained:

"If it's hard to reverse-engineer AI technology, companies may keep it as a trade secret rather than patenting it. Patents only last 20 years, whereas a trade secret can potentially last indefinitely".

3. Japan

Volume of Green Patent Filings

Japan holds a prominent place in the world of green patents. In 2024, it ranked third globally in total patent applications, with 306,855 filings at the Japan Patent Office (JPO). However, its real strength lies in International Patent Families (IPFs) - patents filed in multiple countries that signal higher value and broader global reach. While China overtook Japan in total patent families back in 2013, most Chinese filings remain domestic. In contrast, Japan led the world in IPFs for green transformation technologies from 2010 to 2021 [25,27].

In 2024, Japanese applicants filed 181,963 patent applications abroad, outpacing China's 123,714. Japan also ranked second globally in resident patent applications per $100 billion GDP, with 4,150 filings. This international focus highlights Japan’s commitment to developing globally impactful green innovations, distinguishing it from countries with more domestically focused strategies.

Quality and Innovation Focus of Patents

Japanese green patents are widely recognized for their quality. The country ranks second in the number of "highly cited IPFs" (top 1% by citations) in solar technology, with 182, trailing only the United States, which has 359 [25,27]. Japanese companies are also dominant in solar photovoltaic power generation, with 10 of the top 20 global applicants by IPF volume.

Between 2018 and 2021, Mitsubishi Electric led the world in IPFs for energy-saving buildings (ZEB/ZEH). Panasonic, Toyota, and TDK stood out in the field of secondary batteries during the same period [26,30]. Kaneka also made significant strides, breaking into the global top 10 for solar photovoltaic IPFs [26,30].

Key Technology Sectors Driving Green Patents

Japan’s green patent efforts are concentrated in energy-saving technologies, batteries, and solar power. The country produces over 2,000 annual IPFs in secondary batteries - more than twice the output of the U.S., Europe, or South Korea [25,30]. Impressively, Japanese companies make up 12 of the top 20 global applicants in this category, driven by aggressive R&D in electric vehicle technologies, particularly all-solid-state batteries [26,30].

In energy-saving buildings, Japan files about 2,500 IPFs annually, outpacing Europe’s 1,500 [25,30]. The Japan Patent Office highlights Japan's strengths in several areas:

"Japan has strengths in creating inventions with higher value in such fields as photovoltaic power generation, energy saving in buildings... and secondary (rechargeable) batteries".

Japan’s leadership in solar photovoltaic technology from 2010 to 2018 underscores its ability to deploy advanced technologies effectively. The country is also advancing in emerging fields like perovskite solar cells and fuel cell technology [25,28].

Global and Regional Impact on Sustainable Innovation

Japan’s focus on international patenting aligns with the global push for sustainable innovation. By prioritizing patents with international reach, Japan ensures its green technologies have a broader impact. In 2022, the Japan Patent Office launched the Green Transformation Technologies Inventory (GXTI), a framework for analyzing green patent trends across five key areas: Energy Supply, Energy Saving, Batteries, CO₂ Reduction, and Capture/Storage. This tool helps companies showcase their climate-related technological advantages to investors [25,27,28].

Major corporations like Toyota, Panasonic, and Sony have been acknowledged for their contributions to the United Nations' Sustainable Development Goals through strategic patenting in sectors such as automobiles and electronics, as of August 2023. Takaaki Kimura from Kimura & Partners noted:

"Japan's leadership in international Green Energy patents is a significant marker. Both of Japan's technological inventions, but also their beneficial exploitation globally".

While Japan excels in energy saving and battery technologies, European companies lead in energy supply innovations, and U.S. firms dominate CO₂ reduction and greenhouse gas capture. This regional specialization creates a complementary ecosystem for advancing sustainable innovation worldwide [25,26].

4. Germany

Volume of Green Patent Filings

Germany holds the 5th spot globally for green patent activity. In 2024, the country filed an impressive 133,485 patent applications, with 68,378 of those filed internationally. Within the European Union, Germany leads in international green patent inventions.

Between 2015 and 2018, Germany averaged 84.48 green patents granted per million residents. Its resident patent-to-GDP ratio reached 1,241 patents per $100 billion of GDP in 2024. Together with France, Germany is a key driver of the EU's 21% global share of international green inventions.

Quality and Innovation Focus of Patents

German green patents are known for their high quality. The German Patent and Trade Mark Office (DPMA) reported a 52.9% grant rate, while over 25,000 applications were filed at the European Patent Office (EPO) in 2024, representing 12.6% of all EPO submissions.

Germany's innovation ecosystem thrives on a mix of industrial powerhouses and academic institutions. For the 17th year in a row, Robert Bosch GmbH was the top patent applicant, submitting 4,496 applications to the DPMA in 2024. Other notable contributors include Siemens, with 8,775 active SDG-related international patent families (ranked 12th globally), and Volkswagen Group, with 8,959 such patent families (ranked 11th globally). German universities also play a significant role, with TU Dresden filing 80 patents and the Karlsruhe Institute of Technology submitting 61 in 2024.

Key Technology Sectors Driving Green Patents

Germany's green patent innovations are concentrated in automotive and transport, renewable energy, and battery technology. The automotive sector is shifting gears - patents for electrically driven vehicles rose by 14.4%, while those for traditional engines fell by 5.4%. Solar energy patents also surged, with applications jumping 57.3% to make up 26.8% of international filings.

Battery technology stands out as the strongest category at the DPMA, with 2,627 applications in 2024, marking a 3.4% increase. Similarly, battery-related filings at the EPO saw a significant 24.0% rise.

Volkswagen's software arm, CARIAD, showcases Germany's startup capabilities. In 2024, it published 219 patents - a 47.97% increase from the previous year - focusing on autonomous driving and connectivity. These areas solidify Germany's role in advancing the EU's green innovation efforts.

Global and Regional Impact on Sustainable Innovation

Germany's extensive patent portfolio positions it as a leader in sustainable technology development, both regionally and globally. Robert Hermann, CEO of Germany Trade & Invest, highlighted this strength:

"This year's EPO Patent Index results are resounding proof of the innovative excellence to be found in Germany... Germany will continue to be a strong partner for international companies seeking to develop innovative technologies in areas as diverse as AI, green energy technologies and microelectronics".

Germany excels in energy-intensive industries, circular economy technologies, and clean transport solutions. Its adoption of the new Unitary Patent system, with a 36.5% uptake rate for transforming European patents, reflects its dedication to streamlined innovation across Europe.

Top 10: Countries That Filed the Most International Patent Applications in 2024

5. European Union (Key Players: France, Denmark)

Following Germany's strong performance, the European Union continues to solidify its position as a global leader in green innovation, with France and Denmark making major contributions.

Volume of Green Patent Filings

The European Union accounts for 21% of international green inventions filed between 2012 and 2021, standing as a global leader alongside Japan. Within the EU, France leads in the sheer number of green patent filings, while Denmark boasts the highest global per capita rate, with 93 green patents per million residents.

In 2024, France submitted nearly 11,000 patent applications to the European Patent Office (EPO), reflecting a slight 1.1% increase from the previous year. Denmark, despite filing only 551 green patents in 2021, outshines countries like Switzerland and Sweden in per capita filings. This impressive performance is largely fueled by Denmark’s wind energy sector. Three companies - Vestas, Siemens Gamesa, and LM Wind Power - make up 51% of Denmark's green patent applications.

Jan Hylleberg, Deputy CEO of Green Power Denmark, highlighted this strength:

"We are particularly strong in green energy, and many of the patents have arisen due to our global leadership in the development of highly efficient wind turbines".

Quality and Innovation Focus of Patents

France showcases a diverse and inclusive approach to innovation. In 2024, 31% of French patent applications included at least one woman inventor, placing France third among major filing nations. The scope of French green patents spans clean energy, e-mobility, biotechnology, and research tied to Sustainable Development Goals, much of which is driven by academic institutions.

Denmark’s innovation landscape benefits from generous fiscal policies. The country offers a permanent R&D tax deduction of 130%, along with cash reimbursements of 22% for R&D-related tax losses, capped at DKK 25 million. These incentives have helped Denmark achieve the highest proportion of green inventions relative to its total patent filings. This focus on high-quality innovation supports advancements in targeted technology sectors. This aligns with broader sustainable patent trends currently shaping the global intellectual property landscape.

Key Technology Sectors Driving Green Patents

The "Electrical machinery, apparatus, and energy" sector, which encompasses clean-energy technologies and batteries, is Europe’s fastest-growing area for patent filings, with an 8.9% rise in 2024. Battery innovation alone surged by 24% that year, driven by developments in transport and electric vehicles.

Denmark emphasizes wind energy, green hydrogen, and Power-to-X technologies to decarbonize industrial and maritime activities. Meanwhile, France takes a broader approach, advancing clean energy, transportation, and biotechnology, with academic contributions supporting Sustainable Development Goals.

Global and Regional Impact on Sustainable Innovation

The combined efforts of France and Denmark strengthen the EU’s leadership in green technology, spanning sectors like energy-intensive industries, circular technologies, and clean transportation. Denmark’s per capita achievements demonstrate the power of specialization, while France’s high filing volume ensures the industrial scale needed for EU-wide initiatives.

António Campinos, President of the European Patent Office, underscored the importance of innovation for Europe’s future:

"To stay competitive globally, Europe must enhance its innovation ecosystem and do more to help inventors scale up and commercialise their inventions, especially in critical areas such as green technologies, AI and semiconductors".

Country Comparison Table

The table below highlights how different nations contribute to global advancements in sustainable technology. It compares absolute green patent filings, per capita rankings, and key technology sectors, revealing how each country leverages its unique strengths. While nations like China and Japan lead in sheer volume, smaller players such as Denmark shine when performance is measured per capita.

From 2012 to 2021, Japan accounted for 24% of international green inventions, the largest cumulative share, with the European Union following at 21%. Meanwhile, China saw explosive growth, increasing its share from about 5% to 15% over the same period. These international green inventions - patents filed in at least two jurisdictions - are often seen as having higher commercial potential. The data underscores how different investment strategies, specialized patent tools, and areas of specialization contribute to the global push for sustainable innovation.

This table showcases how countries balance volume, specialization, and innovation quality to drive green technology forward. Together, these varied strategies fuel global progress in sustainable solutions and their commercial applications.

Conclusion

The global landscape of green patents showcases varied strategies among leading nations. China stands out with an unmatched volume of filings, driven by aggressive government policies and significant investments in solar energy, wind power, and energy storage technologies.

In contrast, the United States excels in high-value patents, filing 231,536 applications abroad in 2024 - the highest number worldwide. These international filings highlight a focus on commercial and strategic objectives, as securing patents across multiple jurisdictions requires substantial resources. Similarly, the European Union has carved a niche in circularity technologies and clean transport, accounting for 21% of international green inventions between 2012 and 2021.

The complexity of this evolving landscape calls for advanced analytics. With China filing around 1.8 million patents annually, navigating this data demands sophisticated tools. AI-powered platforms like Patently simplify this process by enabling semantic searches across over 2 billion data points from more than 170 patent offices. They also integrate machine translation for Chinese-language filings, cutting research time and offering real-time insights into competitors.

"China's overwhelming dominance with nearly half of all global filings signals fundamental shifts in where innovation occurs and how patent attorneys must allocate resources".

Understanding these shifts and utilizing advanced tools is essential for driving progress in sustainable technology.

FAQs

What counts as a “green” patent?

A "green" patent refers to inventions aimed at promoting environmental sustainability. These inventions often focus on areas like renewable energy, energy efficiency, pollution control, and strategies to address climate change. Typically, these patents are categorized under the Y02 Cooperative Patent Classification (CPC), which groups technologies with an environmental focus.

Why do some countries file more international green patents than others?

Countries are filing an increasing number of international green patents due to a mix of factors, including investments in research and development, supportive government policies, and a growing focus on sustainability. For example, China has taken the lead in green patents, largely thanks to strong government backing and a focus on innovation. Likewise, countries like the U.S., Japan, South Korea, and those in the EU are major contributors, showcasing their advanced technological expertise, large economies, and policy-driven priorities. Nations with well-developed innovation systems and targeted investments tend to stand out in green patent filings.

Which green tech areas are growing fastest in 2025?

The fastest-growing areas in green technology for 2025 include advanced energy storage, green hydrogen production, enhanced geothermal systems, advanced solar cells, and carbon capture and storage. These advancements are being driven by significant investments and rapid technological progress, pushing forward efforts toward more sustainable development on a global scale.

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