Solar Energy: A New Frontier for Fish and Shrimp Farming

Solar panels above fish ponds cut water use and site emissions

A new farming model combines solar electricity generation with seafood production on the same site. Researchers tested the approach on working clam farms in Taiwan, measuring how different levels of shade from overhead solar panels affected water use, pond temperature, and crop yields. The results suggest that panels covering around 40 to 45 percent of the surface can lower energy costs while helping farms cope with heat and drought.

The study matters because it addresses a practical question many coastal aquaculture businesses face. Rising temperatures increase evaporation and stress livestock. Meanwhile, energy costs for aeration, pumping, and processing continue to climb. Combining solar panels with ponds may offer a way to tackle both problems without sacrificing productive land.

Aquavoltaics describes any system where solar panels share space with food production. In this case, panels were mounted above the water surface rather than on separate ground. Consequently, the same footprint yields both electricity and protein. For regions where land is scarce or expensive, that dual function becomes commercially interesting.

The Taiwan team worked with real farms rather than controlled tanks. They installed panels at varying densities to test different shading levels. Sensors tracked water temperature, evaporation rates, and clam growth over a full production cycle. The approach ensured findings reflected actual field conditions rather than laboratory estimates.

Partial shade reduced pond temperature by 2.5 degrees in summer

Panels covering 40 percent of the pond surface lowered peak water temperature by approximately 2.5 degrees Celsius during the hottest months. That reduction matters because high temperatures reduce dissolved oxygen levels and increase stress on shellfish and fish. Lower water temperatures also slow algae blooms that can foul equipment and harm stock.

In addition, the shaded ponds required roughly 30 percent less water over the study period. Evaporation dropped because less direct sunlight reached the surface. For farms in drought-prone areas, that saving can reduce costs and improve resilience when water restrictions apply. It also cuts the energy needed to pump replacement water from rivers or boreholes.

However, shade does reduce the light available for photosynthetic plankton, which form the base of the pond food web. The researchers found that 40 to 45 percent shading maintained around 70 percent of clam yield compared to fully open ponds. That trade-off means farms lose some aquaculture output but gain electricity revenue and lower operating costs.

The study identified an optimal shading range near 45 percent. At that level, the combined value of electricity generation and water savings outweighed the reduction in clam harvest. Farms can adjust panel density depending on local electricity prices, water costs, and the market value of their seafood. Flexibility matters because those variables change by region and season.

The researchers framed their findings around what they called the water-energy-food-climate-land nexus. Essentially, the system addresses five resource pressures at once. It produces food, generates clean power, conserves water, reduces emissions from grid electricity, and makes better use of limited land. The team argued this represents true integration rather than a simple compromise between competing land uses.

Aquaculture emissions fall when farms switch to renewable energy

Seafood farming produces greenhouse gases mainly through energy consumption, feed production, and transport. A separate review of aquaculture emissions found that switching to low-carbon energy sources offers one of the clearest routes to cutting operational emissions. On-site solar removes the need for diesel generators or grid electricity from fossil fuels.

Aeration pumps run continuously on many fish and shrimp farms to maintain oxygen levels. Those pumps consume significant electricity, especially in intensive systems. Solar panels can cover daytime demand and feed batteries for overnight operation. Consequently, farms reduce fuel costs and carbon output simultaneously.

Feed production contributes another large share of aquaculture emissions, particularly for carnivorous species like salmon or prawns. However, energy use at the farm site remains within the operator’s direct control. Therefore, switching to renewable electricity delivers measurable, immediate reductions that don’t depend on changes elsewhere in the supply chain.

Transport emissions also feature in the overall carbon footprint of seafood. Nevertheless, on-site energy use remains a priority because it recurs daily and scales with production volume. A farm producing 100 tonnes of fish per year will use roughly ten times the electricity of a 10-tonne operation. Reducing that demand through solar generation creates proportional savings.

The Taiwan researchers noted that aquavoltaics moves beyond compromise toward genuine integration. Instead of choosing between food production and renewable energy, the model delivers both. For businesses facing pressure to cut emissions while controlling costs, that dual benefit becomes a commercial advantage rather than an environmental add-on.

Key facts about solar panels over aquaculture ponds

• Panels covering 40 percent of pond surface area reduced peak water temperature by approximately 2.5 degrees Celsius in the Taiwan study.
• Shaded ponds used around 30 percent less water due to lower evaporation rates during the test period.
• Optimal shading near 45 percent maintained roughly 70 percent of clam yield while generating solar electricity.
• Aquavoltaics addresses five resource pressures simultaneously: food, energy, water, climate, and land use.
• Switching to renewable energy sources represents one of the clearest routes to reducing greenhouse gas emissions from aquaculture operations.
• Aeration pumps consume significant electricity on intensive fish and shrimp farms, making solar generation particularly valuable for offsetting operational emissions.

Commercial pressures make dual-use sites more attractive

Several trends increase the appeal of combining solar panels with aquaculture. First, electricity prices remain volatile in many markets. Generating power on-site insulates farms from grid price spikes and allows better cost forecasting. That stability helps when negotiating supply contracts or planning expansions.

Second, water availability continues to tighten in coastal regions. Competition from agriculture, industry, and residential use drives up abstraction costs and regulatory limits. A system that cuts water consumption by 30 percent without major infrastructure changes offers a practical response to those constraints.

Third, public and private procurement increasingly demands lower-carbon products. Retailers and institutional buyers ask suppliers to report emissions and demonstrate reduction efforts. Farms with on-site renewable energy can document lower operational footprints, which strengthens their position in tenders and negotiations.

Fourth, land scarcity in densely populated coastal areas raises the opportunity cost of single-use sites. A hectare used only for solar panels yields no food. A hectare used only for aquaculture yields no electricity. Combining both functions on the same footprint improves land productivity and revenue per hectare.

Fifth, climate adaptation becomes more urgent as heatwaves intensify and water stress increases. Farms without shade or cooling systems face higher mortality rates during extreme weather. Panels that lower water temperature by several degrees can reduce stock losses and improve farm resilience without dedicated cooling equipment.

The Taiwan study also highlighted operational flexibility. Panel density can be adjusted based on seasonal conditions, market prices, and farm priorities. For example, operators might increase shading during summer to protect stock from heat stress, then reduce coverage in winter when light becomes more limiting. Modular panel arrays make those adjustments feasible.

However, the model does involve trade-offs. Reduced yields mean farms need larger ponds to produce the same tonnage of seafood. Capital costs for panel installation add to upfront investment, though these can be offset by energy savings and electricity sales over time. Maintenance also becomes more complex because equipment must withstand humid, saline environments.

Despite those challenges, the integration of solar generation with aquaculture offers a pathway for farms to lower costs, cut emissions, and improve resilience within existing site boundaries. For businesses facing pressure on multiple fronts, that combination addresses several commercial risks at once.

Carbon reporting and procurement criteria include aquaculture

UK businesses sourcing seafood face growing requirements to document supply chain emissions. Public sector procurement rules and corporate net-zero commitments both push buyers to favor lower-carbon suppliers. Aquaculture operations that generate their own renewable energy can provide clearer emissions data and demonstrate tangible reduction efforts.

Large retailers now ask suppliers to report Scope 1 and Scope 2 emissions, which cover direct energy use and purchased electricity. A fish farm running on solar power will show lower Scope 2 emissions than a comparable site relying on grid electricity from fossil fuels. That difference matters when buyers compare bids or select preferred suppliers.

In addition, some procurement frameworks award higher scores to suppliers with certified environmental management systems or renewable energy use. On-site solar generation provides objective evidence of emissions reduction that can be verified through meter data and renewable energy certificates. Consequently, farms with aquavoltaics systems may secure better contract terms or access higher-value markets.

Carbon reporting requirements continue to expand. The government has introduced mandatory climate-related financial disclosures for larger companies, and similar obligations are likely to reach smaller businesses over time. Food producers that invest in emissions reduction now will find compliance easier as regulations tighten.

We support businesses with carbon reporting and ESG compliance, helping suppliers prepare for procurement criteria and regulatory requirements. Understanding how to measure and document emissions from energy use, transport, and operations allows businesses to respond confidently when buyers request environmental data.

For aquaculture businesses considering solar installations, accurate baseline measurement of current energy consumption provides the foundation for calculating potential savings. Subsequently, ongoing monitoring ensures that reported reductions reflect actual performance. That rigor matters because buyers increasingly audit environmental claims and reject vague or unsupported statements.

Where to find further information on aquavoltaics and aquaculture emissions

The Taiwan aquavoltaics study was published in a peer-reviewed journal and provides detailed methodology and results. Researchers interested in replicating the approach or adapting it to different species and climates can refer to the original paper for technical specifications.

The UK government’s Department for Energy Security and Net Zero publishes guidance on renewable energy installations and planning requirements. Farms considering solar panels should check local planning rules, grid connection requirements, and available grants or incentives.

The Environment Agency regulates aquaculture operations in England and provides guidance on water abstraction, discharge permits, and environmental management. Operators planning to modify pond infrastructure or change shading levels should confirm that changes comply with existing permits.

For broader context on seafood production and emissions, the Institute of Environmental Management and Assessment offers resources on life cycle assessment and carbon accounting for food producers. Those tools help businesses measure emissions across their operations and identify where reductions will have the greatest impact.

Businesses exploring sustainable procurement can access guidance from the Chartered Institute of Procurement and Supply, which publishes standards and training materials on environmental criteria in supplier selection. Understanding how buyers evaluate emissions data helps suppliers present their reductions in the most effective format.