What this tool does
Provides an indicative sizing view for hydrogen demand cases, converting output targets into indicative electrolyser capacity, stack count, annual energy use, and water demand.
Electrolyser Sizing Calculator
When to use it
Use it for concept screening, preliminary plant definition, and quick checks before feeding assumptions into CAPEX or LCOH work. Do not use it as a substitute for vendor-specific design or FEED issue sizing.
Key assumptions
- The tool assumes modular electrolyser blocks and a generic system efficiency basis rather than a vendor-specific package.
- Operating hours per day, annual operating hours, and availability determine the practical capacity required to meet demand.
- Water demand is an indicative planning number for early project definition, not a final treatment-system design basis.
- Default values are intended to speed up concept work and should be replaced with project-specific assumptions before external use.
Enter your H2 production target and system parameters. Results update instantly as you adjust any value. Assumes PEM/ALK electrolysis with 1 MW modular stacks. Default values are screening assumptions only and should be replaced for vendor-specific design work.
Sizing Results
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Required Capacity
MW
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Stack Count
× 1 MW stacks
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Annual Energy
MWh/yr
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Water Consumption
L/day
Annual Energy Split
Assumptions: electrolyser core 82%, BOP 12%, compression 6% of total system energy.
Indicative use only. Treat these outputs as screening-grade sizing guidance for early project definition. Before using them in supplier engagement, layout development, or formal design work, validate the assumptions against the selected technology and project operating basis.