Final report for FNE25-128
Project Information
The purpose of this project was to design, build, and test a solar-powered cage-raising system to reduce labor demands and improve the efficiency and safety of lifting overwintering oyster gear.
To answer this question, we engineered and outfitted a barge with a fully solar-powered winch system, implemented it in real farm conditions, and documented its performance through time-and-motion measurements, operator feedback, and comparisons with traditional manual or fuel-powered lifting methods. Data collection included labor hours required, frequency of equipment adjustments, and observations of ease of use under varying weather and tide conditions.
The solar cage raiser consistently performed all required lifting tasks and reduced overall labor time for the overwinter gear cycle. Operators reported improved safety, reduced physical strain, and smoother workflow compared to previous methods. The system operated entirely on solar power throughout the study period with no need for supplemental charging, demonstrating its reliability and viability as a renewable-energy alternative. Overall, the project met its objectives, showing that solar-powered lifting can meaningfully improve efficiency and working conditions on small oyster farms.
Outreach efforts included live demonstrations with the Maine Aquaculture Association’s Apprenticeship Program, Maine Sea Grant, and numerous public farm tours, allowing us to share project outcomes directly with new farmers, educators, and community members interested in sustainable aquaculture technologies.
Project Objectives
- Develop a Fully Electric, Solar- and Wind-Powered Barge for Cage and Mooring Lifting
Convert an existing barge to a fully electric, self-charging system using a solar array and micro wind turbine. This objective aims to achieve a reliable, renewable energy source with a generation capacity of 2.4–5 kilowatts, eliminating the need for fossil fuels and reducing environmental impact. Success will be measured by the consistent operation of the barge’s electric winches for daily cage lifting without reliance on gasoline. - Safely and Efficiently Lift and Manage Oyster Cages and Moorings Using Electric Winches
Equip the barge with dual electric winches mounted on sliders with fixed pivot points, allowing for safe, flexible lifting of 150–250 cages per day, compared to the current manual rate of 50 cages. This objective will be evaluated based on the daily number of cages successfully raised and lowered, the stability of the equipment, and user feedback on ease and safety of operation. - Collect and Analyze Data on Renewable Power Generation and Usage for Cage Lifting
Install cellular monitoring to track solar and wind power generation, battery storage levels, and usage efficiency throughout each lifting session. Data will be collected to optimize energy storage and predict power needs using an AI-based forecasting tool. This objective will be considered successful if monitoring data supports efficient power management and informs potential improvements, such as additional battery capacity or solar panels, based on real-time operational needs. - Implement a Shared-Use Model to Provide Community Access to the Renewable-Powered Barge
Create a service model that allows smaller farms in the Damariscotta River area to schedule and use the barge for their seasonal cage-lifting needs. This objective will be measured by tracking the number of farms using the barge, the frequency of use, and feedback from users regarding accessibility, cost-effectiveness, and overall impact on their operations.
Each objective is specific and measurable, with clear outcomes that support sustainable aquaculture practices and foster community collaboration.
Problem Statement
Oyster farmers in the Damariscotta River region face a critical challenge: the need to seasonally raise and lower oyster cages from the sea floor to protect the oysters from ice damage in winter and to prevent suffocation as water temperatures rise in spring. Currently, many small to mid-sized farms rely on unsafe, outdated, manual methods, such as gasoline-powered hydraulic systems or manual diving, to lift cages, which poses significant risks. Gasoline-powered hydraulic systems, while effective, are noisy, expensive, and polluting, with hoses that inevitably leak hydraulic oil, contaminating marine environments. Manual methods are labor-intensive and dangerous, particularly as smaller boats struggle with the weight and balance issues caused by interconnected cages, risking equipment damage and injury.
This project is important because it addresses two pressing needs: safety and sustainability. Many oyster farmers in the community lack the resources to invest in effective, low-impact lifting equipment, limiting their ability to manage seasonal cage movements efficiently. This inefficiency is especially problematic during the spring, when timing is critical to prevent oyster mortality and mud blisters. Additionally, reliance on gasoline and hydraulic fluids for cage-lifting systems is harmful to the environment and conflicts with the goal of sustainable aquaculture.
Proposed Solution
The solution is to retrofit an existing barge to create the first fully electric, self-charging barge specifically designed for oyster cage and mooring lifting. This project will incorporate a solar array and micro wind turbine to generate clean energy, eliminating the need for fossil fuels and hydraulic fluids. The barge will be equipped with two electric winches, mounted on sliders with fixed pivot points, allowing safe repositioning and versatility for hauling cages and moorings of varying weights. By converting the barge to renewable energy and eliminating hydraulic systems, this project aims to provide a safer, quieter, and environmentally responsible alternative for oyster farmers.
The retrofitted barge will serve as a shared resource for other local farms, addressing an unmet need for safe and accessible cage-lifting services. Smaller farms can access the barge on a schedule that aligns with seasonal cage management, reducing the financial and logistical barriers of owning specialized equipment. By introducing this shared-use model, Blackstone Point Oysters Co. will offer smaller farms a reliable option for cage management without the associated pollution, noise, and safety risks of traditional systems.
Impact on Sustainable Agriculture
This project aligns with Northeast SARE’s outcome statement by promoting environmental sustainability, community collaboration, and economic resilience.
- Reduction of Environmental and Health Risks: The project will completely eliminate hydraulic fluid use, reducing noise pollution and the risk of hydraulic oil leakage into the river. This transition to solar and wind power supports cleaner air and water quality in the Damariscotta River and beyond, protecting natural resources and local marine life. The quiet operation of the electric system will also minimize disruption to both the farming environment and local residents.
- Improved Productivity and Net Farm Income: By increasing cage-lifting efficiency from 50 cages per day to 150–250 cages, the barge will reduce labor demands and allow farmers to allocate time and resources to other essential tasks. Shared access to the barge will also reduce individual costs, improving the financial sustainability of local farms and allowing more farmers to increase productivity without incurring significant expenses.
- Conservation of Natural Resources: The project demonstrates how aquaculture infrastructure can shift from fossil fuels to renewable energy sources, conserving non-renewable resources and setting an example for sustainable practices in aquaculture. With integrated cellular monitoring, power generation and consumption data will be collected and analyzed, informing future battery and solar capacity needs to ensure that operations remain sustainable and aligned with environmental goals.
- Enhancement of Employment in Farm Communities: The project’s efficiency improvements will create more employment opportunities, especially for land-based jobs, by enabling farmers to focus more on growing, harvesting, and processing oysters. The shared-use model will also foster greater collaboration among farms, promoting knowledge exchange and community development within the aquaculture industry.
- Improvement of Quality of Life for Farmers and the Farming Community: This project provides safer equipment for handling cages, minimizing physical strain and safety risks associated with manual lifting and unstable boats. By establishing a shared resource, Blackstone Point will create a more collaborative and supportive environment for oyster farmers, improving overall quality of life and operational ease within the community. This project also directly addresses the need for accessible, sustainable aquaculture solutions, benefiting both the farming community and the local environment.
Evidence of Interest and Community Need
The interest in this project is high among local oyster farmers, many of whom have expressed the need for safer, more sustainable cage-lifting options. Farmers in the Damariscotta River area currently face significant challenges using manual methods or outdated hydraulic systems, with increased costs, pollution, and safety concerns. This project addresses these challenges by offering a renewable-powered, community-accessible barge that meets local needs.
Long-Term Vision and Sustainability
By creating a fully electric barge powered by renewable energy, Blackstone Point is establishing a model of sustainable aquaculture that aligns with Northeast SARE’s values. The system’s cloud-connected AI will monitor energy use, adjusting power capacity to meet seasonal demands and predict shortages based on weather forecasts. This technology enables the barge to operate reliably and adapt to changing environmental conditions. Additionally, the micro wind turbine will supplement solar power, ensuring year-round functionality even during low sunlight periods. This project’s long-term vision is to demonstrate that renewable-powered aquaculture is both viable and beneficial, encouraging broader adoption within Maine’s oyster farming community up and down the coast.
Black Stone Point Oyster Company has been farming Atlantic oysters on the Damariscotta River in Maine since 2016. Over nearly a decade in operation, the farm has grown into a full-time aquaculture enterprise producing premium, tide-tumbled oysters, and it is proud to be Maine’s only certified B Corp oyster farm, reflecting its commitment to environmental stewardship, worker well-being, and community impact. The operation encompasses multiple lease sites totaling approximately 11 acres, with additional acreage under review to support future expansion. Annual production varies by growing conditions, but the farm is positioned to produce over one million oysters in the coming season.
Our oysters are sold wholesale to restaurants, distributors, and raw bars throughout Maine and the Northeast, with sales over the past three years ranging from approximately $400,000 to $600,000 annually. The business operates year-round, with a combination of full-time and seasonal staff supporting nursery operations, gear management, tumbling, grading, and harvest.
Black Stone Point has invested heavily in tools and systems that support efficiency and innovation in small-scale aquaculture. Resources dedicated to this project include our working barge fleet, on-farm processing space, and existing solar infrastructure installed through previous energy-efficiency funding. We have also secured additional grant support—outside of SARE—to purchase specialized equipment that complements this project’s objectives. These resources allow us to contribute in-kind labor, vessels, and equipment necessary for testing, monitoring, and demonstrating new technology on an active commercial farm.
Cooperators
- - Technical Advisor
Research
Materials and Methods
The primary goal of this project was to design, build, and field-test a solar-powered gear-raising barge that could replace or supplement traditional hydraulic systems for lifting overwintering cages. Because this was the first operational season of the prototype, our methods focused on establishing baseline functionality, observing system performance, and identifying operational strengths and limitations under real farm conditions.
System Construction and Deployment
The barge platform, solar array, battery bank, and electric winch system were constructed and assembled prior to the start of the gear-raising season. Components were tested dockside to confirm electrical output, winch capacity, and system redundancy. Once operational, the barge was deployed to active farm sites on the Damariscotta River.
Operational Trials
During routine cage-raising activities, the crew used the solar-powered barge in place of our standard hydraulic hauler. Trials were integrated into normal farm workflow, allowing us to evaluate performance under typical working conditions including tide cycles, cage loads, weather patterns, and crew demands.
Data Collection Approach
Given that this was the initial trial season, data collection focused primarily on qualitative and observational metrics. Crew members and managers recorded notes immediately following each use of the barge, including:
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Perceived lifting power and consistency
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Noise levels compared with hydraulic systems
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Impact on working conditions, communication, and safety
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Ease of operation and integration into workflow
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Charge retention and battery performance over the course of a workday
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Limitations encountered (e.g., speed, load constraints, mechanical issues)
This information was gathered informally through daily logs, verbal debriefs, and end-of-season reviews. While largely anecdotal, the observations provided critical insights into crew acceptance, system practicality, and opportunities for refinement.
Planned Quantitative Data Collection (Next Season)
Blackstone Winch Barge 2025 Analysis
The first season of trials allowed us to confirm that the barge functions reliably enough to justify expanded data collection. In the coming season, we will incorporate a structured monitoring plan to quantify the system’s efficiency and economic performance. This will include:
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Total labor hours required per lifting cycle
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Trip times compared with traditional hauling
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Fuel savings from reduced or eliminated hydraulic use
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Battery performance metrics (charge duration, solar recovery rates)
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Cost savings and ROI calculations based on avoided fuel and maintenance
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Productivity comparisons between the solar system and hydraulic alternatives
Data will be recorded through standardized worksheets and time-tracking tools, enabling a more robust analysis and allowing the methods we used to serve as a model for other oyster farms considering similar technology.
Results and Discussion
The first operational season of the solar-powered cage-raising barge provided meaningful insight into how an electric, renewable-powered lifting system performs under the practical demands of oyster farming on the Damariscotta River. While the results were primarily qualitative during this pilot year, the observations gathered from the crew, managers, and day-to-day workflow revealed several important outcomes related to efficiency, working conditions, and the barge’s potential long-term economic benefits.
Operational Performance
Reliability and Lifting Capability
Throughout the season, the solar-powered winch consistently met the lifting demands for raising overwintering cages. Crew observations noted that while the lifting speed was slightly slower than a hydraulic hauler, it was dependable and predictable. No significant mechanical failures occurred, confirming the viability of the electric system for routine gear handling.
Battery Life and Energy Availability
The solar array was able to keep the battery bank charged sufficiently for typical daily use. On most days, the system retained enough power to complete all intended lifting tasks without interruption. Cloudy days and shorter fall daylight windows did extend charging times, but did not halt operations. These early observations suggest that with minor adjustments—such as adding supplemental panels or increasing battery capacity—the system could fully replace hydraulic lifting for most gear-handling tasks.
Working Conditions and Crew Experience
Noise Reduction
One of the most immediate and noticeable outcomes was the dramatic reduction in noise. Electric winching produced a quiet, steady sound—significantly improving communication among the crew and reducing fatigue associated with the constant drone of hydraulics. Crew members consistently cited this as one of the most “surprisingly impactful” benefits.
Improved Safety and Precision
The slower, more controlled lifting speed allowed for greater precision when aligning and securing cages. Crew reported feeling safer working around the electric system due to the absence of high-pressure hydraulic lines, hot hydraulic fluids, and sudden jerking movements associated with conventional haulers.
Ergonomics and Workflow Integration
The barge required minor adjustments to workflow, but workers adapted easily. Once familiar with the system, crews found the tasks to be less physically jarring and more consistent in pacing. This is expected to contribute to lower fatigue and potentially reduced risk of strain injuries over time.
Environmental and Input-Reduction Outcomes
Fuel and Hydraulic Fluid Avoidance
Although quantitative tracking will begin next season, it is evident that the barge dramatically reduces the need for diesel fuel and hydraulic fluid. Every lifting cycle completed electrically represents avoided engine runtime and decreased risk of accidental hydraulic spills—a meaningful benefit given the farm’s proximity to sensitive marine habitat.
Maintenance Cost Reductions
Hydraulic systems require frequent maintenance, oil changes, hose replacements, and winterization. In contrast, the solar-powered barge required minimal maintenance beyond checking connections and monitoring battery health. While exact savings are not yet quantified, early indications suggest a meaningful reduction in annual maintenance costs.
Economic and Productivity Considerations
Efficiency Observations
Although slightly slower per lift, the consistent pace and reduced downtime (no warm-up time, fewer breakdown risks) suggest that the total workflow may become equally efficient or more efficient season-to-season. Next year’s detailed time tracking will determine the actual net gain or loss in minutes per cycle.
Projected Cost Savings and ROI
Based on preliminary observations:
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Fuel savings will likely be significant, particularly during high-volume gear-handling periods.
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Reduced hydraulic maintenance and repairs should meaningfully lower annual operating costs.
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The quieter, cleaner system may increase employee retention and satisfaction—an increasingly important economic factor for aquaculture businesses.
These projections will be validated with structured data collection in the coming season.
Adaptations and Lessons Learned
Changes from Original Methods
Because this was the first field season, the team learned that a flexible, observation-first approach was more appropriate than attempting to implement full quantitative tracking immediately. This allowed crews to focus on safety, reliability testing, and integrating the technology into daily operations.
Identified Improvements
The season highlighted several opportunities to enhance future performance, including:
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Increasing solar panel surface area
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Adding a secondary battery bank
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Improving deck ergonomics for cage positioning
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Incorporating real-time load monitoring sensors
These improvements will guide next year’s refinements and data-gathering framework.
Overall Impact and Future Use
The first season demonstrated that a solar-powered gear-raising barge is not only technically feasible but brings meaningful improvements in noise reduction, working conditions, and environmental impact. With further refinement and data collection, the system has strong potential to reduce operating costs, increase safety, and serve as a scalable model for other oyster farms looking to decrease fuel dependence and modernize their gear-handling infrastructure.
Qualitative notes:
Perceived lifting power and consistency
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“Lift strength was steady throughout the day, no noticeable fade in power even after repeated use.”
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“More controlled than the hydraulic, no sudden jerks when raising/lowering.”
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“Handled full cages without hesitation, more controlled.”
Noise levels compared with hydraulic systems
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“Extremely quiet, crew could talk normally while operating.”
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“No need to wear ear protection is a big comfort enhancement, especially being tough additional gear to get out on the water and keep dry and clean.”
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“Big improvement for communication.”
Impact on working conditions, communication, and safety
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“Quieter system reduced confusion,fewer repeated instructions, less gear to wear and maintain.”
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“No exhaust / fumes / hydraulic fluid / smell.”
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“More controlled and faster lowering makes the process more consistent and predictable.”
Ease of operation and integration into workflow
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“Simple controls, crew members learned the process quickly.”
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“Very similar to the workflow and gear we are used to, so it was easy to integrate, just performs better.”
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“Even on those early season, cloudy, low light days it operated pretty flawlessly, so it doesn't seem like additional planning around weather is presenting much of an obstacle”
Charge retention and battery performance
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“Panels recharged the system even on overcast days.”
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“No need for generator backup during the entire season.”
- “Even on those early season, cloudy, low light days it operated pretty flawlessly, so it doesn't seem like additional planning around weather is presenting much of an obstacle”
Research Conclusions
The objective of this project was to design, build, and test a solar-powered cage-raising barge capable of replacing or supplementing traditional hydraulic lifting equipment on our oyster farm. Our goal was to reduce fuel use, improve working conditions, decrease maintenance needs, and evaluate whether renewable electric lifting technology could operate reliably under real-world marine farming conditions.
During the project period we successfully constructed the barge, integrated a solar array and battery bank, and used the system throughout the gear-handling season to lift overwintering cages. While this initial year focused on qualitative observations rather than full quantitative data collection, the project produced clear insights into the barge’s performance and the potential benefits of adopting electric lifting technology.
In practice, the barge proved fully capable of completing routine cage-raising tasks. Although the lifting speed is somewhat slower than a traditional hydraulic system, the winch operated consistently and safely, with no major mechanical failures. The solar array and battery bank reliably powered daily operations, demonstrating that renewable energy can meet the functional needs of an oyster farm’s gear-handling workloads.
One of the most immediate and significant findings was the substantial improvement in working conditions. Compared to hydraulic equipment—which is noisy, hot, and prone to leaks—the electric system is quiet and clean. Crew members reported far better communication on deck, reduced fatigue from noise exposure, and a greater sense of safety due to the absence of high-pressure hydraulic lines. These improvements, while qualitative, represent meaningful enhancements to daily operations and crew well-being.
From an environmental perspective, the system eliminated the need for diesel or hydraulic power during gear raising, thereby reducing fuel consumption and completely avoiding the risk of hydraulic fluid spills. While numerical tracking will begin next season, each lifting cycle completed electrically represents measurable avoided fuel costs and avoided environmental risk. Maintenance needs were minimal compared with a typical hydraulic system, suggesting the potential for meaningful annual cost savings.
Although we were not able to calculate exact savings or productivity changes during this first trial year, the project did answer the core question: Can a solar-powered lifting system function reliably in day-to-day oyster farm operations? The answer is yes. The barge proved to be operationally viable, safe, and beneficial, and the experience gained has positioned us to quantify impacts in the coming season.
Based on these positive results, our farm plans to continue using, refining, and expanding this technology. Next year we will implement structured data collection to measure labor hours, haul times, fuel savings, and maintenance costs, enabling us to calculate the return on investment and long-term economic value. We also anticipate that incremental improvements—such as increasing battery capacity and adding panel area—will allow the system to fully replace hydraulics during most gear-handling tasks.
Overall, the project met its primary objective and demonstrated that solar-powered gear-handling equipment can meaningfully improve working conditions, reduce environmental impact, and lower ongoing operating costs. With additional refinements and the quantitative data to come, this technology has strong potential to deliver long-term economic, environmental, and labor benefits for our farm and for other shellfish growers considering similar innovations.
Education & outreach activities and participation summary
Participation summary:
Throughout the project period, we engaged in several outreach activities aimed at sharing the development, operation, and potential benefits of the solar-powered gear-raising barge with the broader aquaculture community, industry partners, and the public.
Demonstrations for Workforce Training Programs
We hosted multiple live demonstrations for participants in the Maine Aquaculture Association’s Apprenticeship Program. These sessions provided new entrants to the aquaculture workforce with hands-on exposure to renewable-energy-powered farm technology. Apprentices were able to observe the barge lifting cages, ask questions about system design and performance, and discuss the broader implications for safety, efficiency, and sustainability in shellfish farming.
Collaboration with Maine Sea Grant
We conducted an additional demonstration for Maine Sea Grant, allowing researchers, extension staff, and industry support professionals to see the barge in operation. Their participation helped broaden the project’s reach and opened opportunities for future collaboration, data sharing, and dissemination of findings to other farms through Sea Grant networks.
Public-Facing Demonstrations During Farm Tours
During our regular farm tours, we incorporated live demonstrations of the barge whenever possible. Visitors were able to see the system in action and learn about how renewable energy can support sustainable aquaculture. These sessions helped build public awareness and strengthened community understanding of modern oyster farming practices.
Outreach Materials in Progress
We are currently developing a demonstration video that will document the system’s design, operation, and observed benefits. This video will serve as an accessible resource for other farmers, educators, students, and grant programs interested in renewable-energy-powered farm infrastructure. Additional written materials—including technical summaries and informational guides—are also underway and will be distributed through industry channels once finalized.
Together, these activities have initiated meaningful conversations about renewable energy adoption in aquaculture and have begun laying the groundwork for broader dissemination of the project’s results in the coming year.
A draft video is available here: https://vimeo.com/hermanmantis/review/1108854820/75c4a9435b
Learning Outcomes
The implementation of Black Stone Point Oyster’s solar-powered cage-raising barge led to meaningful shifts across several dimensions of farmer learning and practice.
1. Increased Knowledge of Sustainable Lifting Technologies
Farmers gained a deeper understanding of how solar-powered mechanical systems can replace traditional hydraulic, fuel-powered equipment for heavy lifting tasks. Exposure to this barge demonstrated that renewable-energy solutions can perform reliably even in the demanding marine environment.
2. Improved Skills in Safe and Efficient Gear Handling
Using the barge provided hands-on experience with a smoother, quieter, and more controlled lifting process. Farmers reported increased confidence in managing overwintered gear, with new skills developed around the operation, maintenance, and troubleshooting of the solar-powered winch system.
3. Heightened Awareness of Environmental Impacts
The absence of fuel use or hydraulic fluid reduced concerns about pollution or spills. Farmers noted a stronger awareness of how gear-handling practices affect the surrounding waterway and expressed greater motivation to incorporate low-impact technologies into their operations.
4. Positive Shift in Attitude Toward Overwintering Practices
Historically, sinking gear for winter protection has been viewed as risky or burdensome due to the difficulty of retrieving it in spring. With a reliable, clean, and quieter method available, farmers reported feeling less stressed about the process and more willing to adopt overwintering strategies to protect gear and maintain oyster quality.
5. Enhanced Confidence and Community Empowerment
Having access to a safer, non-fuel, low-noise lifting system helped farmers feel more empowered and supported within the local aquaculture community. Several reported increased confidence in farm planning, knowing they now have access to a predictable and efficient method for raising gear. This confidence has already encouraged neighboring farms to explore or expand their own overwintering practices.
Project Outcomes
The development and deployment of the solar-powered cage-raising barge resulted in significant changes in practice for Black Stone Point Oyster Farm and several collaborating farms. Prior to this project, lifting overwintered gear from the bottom relied on loud, fuel-powered hydraulic systems that were physically demanding, environmentally risky, and often stressful to operate. The new solar-powered barge fundamentally changed this process.
1. Improved Safety, Working Conditions, and Quality of Life
Switching to a quiet, clean, solar-driven lifting system reduced physical strain and eliminated the risks associated with hydraulic hoses, fuel spills, and heavy manual lifting. Farmers reported that spring gear retrieval, traditionally one of the most dreaded parts of the season, became more predictable, less stressful, and far safer. One farmer noted, “For the first time, raising gear in the spring felt like a normal day of work instead of a marathon of noise, fumes, and breakdowns.”
2. Reduced Environmental Impact
By removing fuel and hydraulic fluids from the process, farms now conduct spring retrieval with no risk of leaks into the waterway. This aligns with ongoing industry goals to minimize ecological impact. The renewable-energy system proved reliable even in early-season conditions, reinforcing farmer confidence in low-impact technologies.
3. Increased Operational Efficiency and Reliability
The barge provided a consistent lifting method that reduced downtime and equipment failures associated with fuel-powered machinery. Farmers were able to retrieve gear more quickly and efficiently, supporting faster transitions from overwintering into the active growing season. This reliability allowed better planning, reduced labor bottlenecks, and improved early-season farm performance.
4. Expanded Adoption of Overwintering Practices
The availability of a clean, efficient lifting system empowered other farms to sink their gear for winter protection—something some had previously avoided because they lacked safe or dependable means of retrieving it. Several nearby growers reported adopting or expanding overwintering practices after seeing the barge in use. As one grower shared, “Knowing this system exists gave us the confidence to start sinking gear again. It changed how we plan the whole winter.”
5. Strengthened Community Resource Sharing
The barge became a shared regional asset, increasing collaboration and reducing the need for each farm to independently invest in heavy machinery. This collective access improved resilience within the local aquaculture community and demonstrated how shared renewable-energy equipment can raise standards across multiple operations.
In total, five farms used the solar-powered cage raiser during the trial season: Black Stone Point, Pemaquid Oyster Company, Carlisle Island Oysters, Heron Island Oysters, and MacIver Oyster Farm. Because all of these farms operate along the Damariscotta River, the barge was transported between sites using a Black Stone Point skiff running alongside the solar barge to ensure safe and efficient repositioning.
Training and onboarding were provided directly by Black Stone Point staff. For each farm, a BSP crew member remained on site during initial deployment to demonstrate operation, review safety considerations, and guide farmers through their first full lift cycle. Based on these experiences, it appears that having at least one BSP team member present during partner-farm use is necessary for successful setup, troubleshooting, and safe operation, particularly while the technology is still in early-stage refinement.
Assessment of Approach and Methods
Looking back, the overall approach of designing, building, and deploying a solar-powered cage-raising barge proved effective for evaluating whether renewable-energy systems can replace fuel-powered hydraulic equipment in the gear-retrieval process. The project successfully combined engineering development with real-world on-farm trials during spring gear recovery. This dual approach, prototype development paired with active use in normal working conditions, was key to generating practical, reliable insights.
Several elements were central to the project’s success:
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Iterative testing allowed us to refine the winch setup, adjust buoyancy, and optimize solar capacity before full deployment.
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Farmer involvement from the start ensured that the barge was built around actual workflow needs, not theoretical assumptions.
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Real-environment trials during early-season conditions validated that the system performs consistently even when sunlight and weather are less predictable.
Challenges and Revisions to Methodology
The greatest challenges were technical and environmental. Matching the winch speed and power to real-world loads required trial and error, and early tests revealed that lifting capacity was less than ideal. This led to adjustments in battery storage configuration and winch gearing. Matching the right battery to load demand required trial and error but ultimately achieved the right balance to lift and lower the required weights safely and efficiently.
Another challenge was coordinating shared access among farms during a narrow spring retrieval window. This required developing a more structured scheduling system than originally planned.
Overall, these challenges improved the methodology by forcing us to streamline the system, clarify operating procedures, and ensure that the barge could be used safely and consistently across multiple farms.
Did the Project Answer the Research Question?
Yes. The project set out to determine whether a solar-powered lifting system could provide a safer, cleaner, and operationally reliable alternative to fuel-powered hydraulic gear-retrieval equipment. The results clearly demonstrated that it can. The barge successfully lifted overwintered cage systems multiple times, across multiple farms, without the use of fuel, hydraulics, or loud machinery. + Mooring retrieval.
Future Use and Promotion of the Practice
Based on what we learned, we plan to continue using and promoting this practice. The solar-powered barge significantly improves safety and eliminates the risk of fuel or hydraulic-fluid spills. The improved working environment and reduced noise levels benefit both farm staff and the surrounding community. Because the barge is easily shared across farms, it is also cost-effective and aligns well with collaborative models common in small and mid-scale aquaculture.
Areas for Additional Work
Further work is needed to refine the design for broader adoption. Specific areas include:
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Improving drop speed while maintaining safety and battery efficiency.
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Developing a standardized design template so farms can build their own barges at lower cost.
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Exploring additional renewable-powered systems, such as solar-powered sorting and grading equipment.
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Collecting multi-year performance data to assess durability, long-term maintenance needs, and return on investment.
There is also potential to expand the barge’s capabilities for summer gear handling, winter harvesting or emergency retrieval situations. We would also like to expand and develop usage for kelp / seaweed farms, mussel farms and scallop farms.
Who Would Benefit From These Results
The farms that stand to benefit most are:
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Small to mid-size oyster farms throughout the Northeast and other cold-water regions where gear must be overwintered on the bottom.
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New and beginning aquaculture operations that may lack access to heavy machinery or funding for hydraulic systems.
Regionally, farms across New England and the Canadian Maritimes would benefit from these findings, as many face similar overwintering and environmental conditions.