China Builds World’s Largest Offshore Floating Solar Farm in Push for Clean Energy
Published · 6 min read
China has completed the world’s largest offshore floating solar installation, marking a major milestone in renewable energy development. The massive project shows how the country is turning to water-based solar farms to generate electricity without using valuable land.
1-Gigawatt Project Goes Online
China Energy Investment Corporation connected its HG14 project to the grid in late December 2025. The facility can produce 1 gigawatt of electricity, making it the largest open-sea floating solar installation ever built.
Located 8 kilometers off the coast of Dongying in Shandong province, the project covers 1,223 hectares of shallow coastal waters. It uses more than 2.3 million solar panels mounted on 2,934 steel platforms anchored by thousands of piles.
The installation cost approximately $1.2 billion to build. It represents China’s first gigawatt-scale offshore solar development and the first approved under the nation’s three-dimensional sea-use rights framework.
Massive Power Output Expected
The facility will generate roughly 1.78 terawatt-hours of electricity each year. That’s enough to power about 2.6 million households while cutting carbon dioxide emissions by more than 500,000 tons annually.
The project includes underwater cables that carry electricity to shore and a battery storage system that boosts efficiency by approximately 20 percent. The storage helps provide power even when solar generation drops.
How Floating Solar Works
Floating solar farms place panels on buoyant platforms anchored to water surfaces rather than fixed to land. The systems use specialized floating structures made from materials like high-density plastic or steel frameworks.
The panels connect to shore through waterproof cables. They adjust naturally to changing water levels, rising and falling with the surface throughout the year.
Water provides a key advantage: cooling. Solar panels lose efficiency as they heat up, but water keeps floating panels 10 to 15 degrees Celsius cooler than land-based systems. This cooling effect increases electricity production by 5 to 15 percent compared to ground-mounted panels.
China Dominates Global Deployment
China leads the world in floating solar technology. Beyond the HG14 project, the country operates other major installations that demonstrate its commitment to water-based renewable energy.
The Dezhou Dingzhuang Floating Solar Farm in Shandong Province holds the record for largest floating solar project on a single reservoir, with 320 megawatts of capacity. Commissioned in 2020, it combines floating panels with wind turbines and battery storage.
The Three Gorges New Energy Floating Solar Farm in Anhui Province was previously the world’s largest at 150 megawatts. Built on a lake formed from a collapsed coal mining area, it generates enough power for about 94,000 households.
These projects show how China transforms degraded landscapes into productive energy facilities while avoiding competition for agricultural land.
Record-Breaking Solar Growth
The floating solar expansion fits within China’s extraordinary renewable energy push. In 2025 alone, the country installed 315 gigawatts of new solar capacity, a 45 percent increase over 2024 levels.
That single year’s installation exceeded the total solar capacity of any other nation. By year-end 2025, China’s total installed solar capacity reached approximately 1,200 to 1,300 gigawatts, making it the first country to surpass the 1,000 gigawatt milestone.
The China Electricity Council projects solar power may overtake coal as the nation’s largest installed generation source during 2026. This historic shift comes decades ahead of earlier predictions.
Combined wind and solar capacity reached 1.84 billion kilowatts by late 2025, representing 47.3 percent of China’s total power generation capacity and exceeding coal-fired capacity for the first time.
Water Conservation Benefits
Floating solar farms provide environmental benefits beyond electricity generation. The panels dramatically reduce water evaporation from covered reservoir and lake surfaces.
Research shows floating panels can cut evaporation by 50 to 70 percent in covered areas, saving millions of gallons annually at large installations. This proves especially valuable in drought-prone regions facing water stress.
The panels also shade the water, lowering surface temperatures and limiting harmful algal blooms. Studies found floating arrays reduced average water temperatures by about 1.2 degrees Celsius, with reductions reaching nearly 2 degrees during summer heat waves.
This temperature control helps aquatic ecosystems and can improve water quality by suppressing algae that depletes oxygen and releases toxins.
Higher Costs Offset by Better Performance
Floating solar projects cost more to build than land-based systems, typically 10 to 29 percent higher due to specialized equipment and marine-grade materials. But the enhanced electricity production often justifies the extra investment.
Studies show higher capital costs are substantially offset by superior energy yields and lower operational expenses over 25 to 30 year operating periods. In areas with high land prices or limited space, floating solar becomes especially attractive.
The technology also leverages existing infrastructure at reservoirs and dams, avoiding land acquisition costs and simplifying grid connections.
Market Poised for Rapid Expansion
The global floating solar market was valued at approximately $5.3 billion in 2024. Industry projections estimate it will reach $40.35 billion by 2034, representing annual growth of 22.5 percent.
The Asia-Pacific region dominates demand, accounting for about 70 percent of worldwide installations in 2023. China, India, and Indonesia represent the primary deployment centers.
The World Bank estimates global floating solar potential could reach approximately 4 terawatts if 10 percent of available man-made reservoir surfaces are utilized. More ambitious estimates suggest potential ranging from 3 to 9 terawatts.
As production volumes increase and technology advances, capital costs are expected to decline substantially, potentially achieving price parity with ground-mounted systems within five to ten years.
Challenges Remain
Despite progress, floating solar faces technical hurdles. Offshore projects must withstand harsh marine conditions including high waves, strong currents, and extreme weather.
Saltwater corrosion poses a significant challenge for coastal installations. Studies show corrosion can reduce panel efficiency by approximately 5 percent annually without proper protective measures and specialized materials.
Maintenance requires specialized equipment including boats and waterproof tools. Cleaning procedures differ from land-based systems due to algae and mineral deposits that accumulate differently on water-based installations.
Environmental assessment during planning remains crucial to ensure projects don’t harm aquatic ecosystems. While early monitoring suggests well-designed installations create net benefits, longer-term research continues on impacts to fish, invertebrates, and migratory birds.
Regulatory complexities also create barriers in many jurisdictions, particularly where water bodies face stringent environmental protections or unclear permitting frameworks.
Strategic Path Forward
China’s massive floating solar expansion demonstrates a practical solution to generating clean energy without consuming agricultural land. The completion of the 1 gigawatt HG14 project proves the technology’s maturity for utility-scale deployment in demanding environments.
As China pursues its carbon peaking goal for 2030 and carbon neutrality by 2060, floating solar will likely constitute a growing portion of new generation capacity. The approach simultaneously addresses energy security, emissions reduction, and land scarcity.
China’s pioneering role positions the nation as the technology leader shaping global renewable energy patterns. Global adoption will depend on continued cost reduction, technological standardization, environmental best practices, and regulatory clarity.
The convergence of rising energy demand, climate concerns, and advancing technology suggests water-based solar power will transition from innovative pilot projects to mainstream infrastructure deployed worldwide.
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