Short answer
When designing integrated offshore wind and hydrogen systems, focus on reducing the embodied energy in wind turbine manufacturing and the operational energy demand of the electrolysis process, favoring PEM technology for its lower carbon footprint.
- Field
- Sustainability
- Source
- Energies (2025)
- Method
- Process-based Life Cycle Assessment (PLCA)
- Evidence
- Strong effect
Life cycle assessments reveal that while offshore wind power's environmental impact is dominated by manufacturing, hydrogen storage's impact is primarily from operational electricity consumption, with PEM electrolysis offering a significantly lower carbon footprint than alkaline electrolysis. This sustainability research insight is drawn from a 2025 study published in Energies. Using Process-based life cycle assessment (plca), researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing integrated offshore wind and hydrogen systems, focus on reducing the embodied energy in wind turbine manufacturing and the operational energy demand of the electrolysis process, favoring PEM technology for its lower carbon footprint.
Optimizing Offshore Wind and Hydrogen Systems for Reduced Environmental Footprint
Life cycle assessments reveal that while offshore wind power's environmental impact is dominated by manufacturing, hydrogen storage's impact is primarily from operational electricity consumption, with PEM electrolysis offering a significantly lower carbon footprint than alkaline electrolysis.
Energies · 2025
Key Findings
- 01Offshore wind power's environmental impacts are predominantly from the manufacturing phase (79.00%), driven by concrete and steel.
- 02Hydrogen storage impacts are concentrated in the operation and maintenance phase (66.03% for AEL, 96.61% for PEM), driven by electricity consumption.
- 03PEM electrolysis exhibits a significantly lower global warming potential (GWP) for green hydrogen (0.96 kg CO2-eq/kg) compared to AEL (1.81 kg CO2-eq/kg) and fossil-based hydrogen (approx. 40 kg CO2-eq/kg).
- 04Extending system lifespan by 5 years, increasing wind farm capacity factor to 43%, and enhancing hydrogen production efficiency to 71% can reduce emissions by 16.67%, 4.00%, and 2.16%, respectively.
Application
Design takeaway
When designing integrated offshore wind and hydrogen systems, focus on reducing the embodied energy in wind turbine manufacturing and the operational energy demand of the electrolysis process, favoring PEM technology for its lower carbon footprint.
How to apply
When designing or specifying offshore wind and hydrogen storage systems, conduct a comparative life cycle assessment to identify the most impactful phases and technologies, and use the functional unit defined in this study for consistent comparison.
Project actions
- 01When assessing your design, consider its entire life cycle from raw materials to disposal.
- 02Quantify environmental impacts using established metrics like Global Warming Potential (GWP).
Method & Evidence
Variables
Strengths & Limitations
Strengths
- +Comprehensive 'cradle-to-grave' assessment.
- +Comparison of two key hydrogen production technologies.
- +Analysis of multiple environmental indicators.
- +Exploration of mitigation strategies through parameter variation.
Limitations
Conducting a full LCA can be data-intensive and time-consuming. Assumptions made about material sourcing, energy grids, and end-of-life scenarios can significantly influence results.
Reliability & validity
The reliability and validity of the study depend on the accuracy of the input data for materials, energy consumption, and transportation. The use of a standardized PLCA methodology enhances comparability, but the specific parameters chosen for the system (e.g., capacity factor, lifespan) can influence the results.
Think critically
How might the 'electricity–hydrogen cogeneration' aspect of the functional unit influence the comparison between different electrolysis technologies, and what are the implications of this for system design?
Design Principles
"Life cycle thinking is essential for evaluating the true environmental impact of complex energy systems, guiding design choices towards minimizing overall ecological burdens."
Understanding the full life cycle impacts of integrated renewable energy systems is crucial for effective decarbonization strategies. This research provides data-driven insights into where environmental burdens lie, enabling designers and engineers to prioritize mitigation efforts in manufacturing, operation, and technology selection.
What This Means for Your Design
This study looked at the total environmental impact of offshore wind farms that also make hydrogen. It found that making the wind turbines causes the most pollution, while using electricity to make hydrogen causes the most pollution for the hydrogen part. PEM technology is better for the environment than alkaline technology for making hydrogen.
How to use in your project
- 1.Use the methodology of Life Cycle Assessment (LCA) to evaluate the environmental impact of your design choices.
- 2.Cite this study when discussing the environmental trade-offs between different renewable energy technologies or production methods.
Add to My Project
Quick Cite
Paragraph starter
This research employed a process-based Life Cycle Assessment (PLCA) to evaluate the environmental impacts of an offshore wind power system integrated with a hydrogen energy storage system. The study highlighted that manufacturing processes for offshore wind components, particularly those involving concrete and steel, contribute significantly to the overall environmental burden. For the hydrogen storage component, the operational phase, specifically electricity consumption for electrolysis, was identified as the primary driver of environmental impact. Furthermore, the comparison between Proton Exchange Membrane (PEM) and Alkaline Electrolysis (AEL) technologies revealed that PEM offers a substantially lower Global Warming Potential (GWP) for green hydrogen production. The findings underscore the importance of considering the entire product life cycle when designing sustainable energy solutions and suggest that optimizing operational efficiencies and selecting lower-impact technologies like PEM are critical for reducing the environmental footprint of renewable energy systems.
Source
Energies
Life Cycle Environmental Impact Assessment of Offshore Wind Power Combined with Hydrogen Energy Storage System
journal · 2025
View sourceQuestions About This Research
- What does the research say about optimizing offshore wind and hydrogen systems for reduced environmental footprint?
- When designing integrated offshore wind and hydrogen systems, focus on reducing the embodied energy in wind turbine manufacturing and the operational energy demand of the electrolysis process, favoring PEM technology for its lower carbon footprint. Evidence: Energies (2025).
- Why does "Optimizing Offshore Wind and Hydrogen Systems for Reduced Environmental Footprint" matter for design?
- Understanding the full life cycle impacts of integrated renewable energy systems is crucial for effective decarbonization strategies. This research provides data-driven insights into where environmental burdens lie, enabling designers and engineers to prioritize mitigation efforts in manufacturing, operation, and technology selection.
- How can designers apply this research?
- When designing integrated offshore wind and hydrogen systems, focus on reducing the embodied energy in wind turbine manufacturing and the operational energy demand of the electrolysis process, favoring PEM technology for its lower carbon footprint.
- What were the main findings?
- Offshore wind power's environmental impacts are predominantly from the manufacturing phase (79.00%), driven by concrete and steel.. Hydrogen storage impacts are concentrated in the operation and maintenance phase (66.03% for AEL, 96.61% for PEM), driven by electricity consumption.. PEM electrolysis exhibits a significantly lower global warming potential (GWP) for green hydrogen (0.96 kg CO2-eq/kg) compared to AEL (1.81 kg CO2-eq/kg) and fossil-based hydrogen (approx. 40 kg CO2-eq/kg).. Extending system lifespan by 5 years, increasing wind farm capacity factor to 43%, and enhancing hydrogen production efficiency to 71% can reduce emissions by 16.67%, 4.00%, and 2.16%, respectively.
- What research method was used?
- Process-based Life Cycle Assessment (PLCA).
- How strong is the evidence?
- Evidence strength is rated Strong effect, based on a 2025 journal from Energies.
- What should I do differently in my next project?
- When designing or specifying offshore wind and hydrogen storage systems, conduct a comparative life cycle assessment to identify the most impactful phases and technologies, and use the functional unit defined in this study for consistent comparison.
- What are the limitations?
- The study's findings are based on specific system parameters (lifespan, capacity factor, efficiency) and may vary with different configurations and regional conditions. The assessment is limited to the 12 environmental indicators studied.