What the study found
The study found that a double-pass reverse osmosis (RO) system could be integrated with a renewable hydrogen energy system to produce freshwater and electricity for a remote island setting. The authors report levelized costs of electricity and hydrogen of 0.165 $/kWh and 40.5 $/kg, respectively.
Why the authors say this matters
The authors conclude that the findings demonstrate the feasibility of combining double-pass reverse osmosis with renewable hydrogen generation to provide a scalable solution for simultaneous freshwater and electricity production in remote and resource-constrained regions. They also note that freshwater availability is a constraint for hydrogen production because electrolysis requires high-quality water.
What the researchers tested
The researchers carried out a techno-economic analysis of an integrated system designed for a remote island in southeast Australia. The system included photovoltaic panels, wind turbines, a proton exchange membrane electrolyser, fuel cell stacks, hydrogen storage tanks, lithium-ion batteries, and a double-pass reverse osmosis unit, with the RO system modelled in MATLAB.
What worked and what didn't
The integrated system produced electricity at a levelized cost of 0.165 $/kWh, and the electrolyser used 4,148.9 MWh/year of excess electricity to produce 63,110 kg of hydrogen annually. It required 1,073 m3 of freshwater, and the water production cost ranged from 4.34 $/m3 to 6.90 $/m3 depending on system parameters, while this had only a marginal impact on the levelized cost of hydrogen.
What to keep in mind
The abstract reports that feed pressure in the first pass of the double-pass RO system and the number of elements per pressure vessel can significantly affect the economics of the system. It also states that levelized cost of electricity decreases with inflation and rises with discount rate, while net present cost shows the opposite trend; other limitations are not described in the available summary.
Key points
- A double-pass reverse osmosis system was integrated with a renewable hydrogen energy system for a remote island in southeast Australia.
- The authors report levelized costs of 0.165 $/kWh for electricity and 40.5 $/kg for hydrogen.
- The electrolyser used 4,148.9 MWh/year of excess electricity and produced 63,110 kg of hydrogen annually.
- Freshwater demand for hydrogen production was 1,073 m3 per year.
- Water production cost ranged from 4.34 $/m3 to 6.90 $/m3 across key system parameters.
- Variations in feed pressure and number of elements per pressure vessel affected the system economics.
Disclosure
- Research title:
- Integrated desalination-hydrogen system produced electricity and freshwater
- Authors:
- Pranjal Kumar, Abhijit Date, Bahman Shabani
- Institutions:
- RMIT University, RMIT University, RMIT University
- Publication date:
- 2026-02-14
- OpenAlex record:
- View
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