Technical challenge
Electrolyser output follows available power, minimum load, starts, storage capacity and the required hydrogen delivery schedule.
Introduction
Producing Hydrogen from Renewable Electricity.
Convert renewable electricity and water into hydrogen for a defined transport, industrial, storage or power application.
Electrolysis creates hydrogen from water using electricity; the project value depends on the source, timing and cost of that electricity and the value of the hydrogen produced.
A successful project aligns renewable availability, electrolyser operation, hydrogen demand, water, storage and electricity-market value.
The Challenge
Define the service problem before selecting technology.
New Zealand has a highly renewable electricity system and site-specific wind, solar, hydro and geothermal opportunities, but electricity still has competing direct uses.
Business challenge
Reliability, utilisation, logistics, asset life and future demand must be translated into a commercial requirement that can be compared consistently across competing solutions.
Human challenge
The selected pathway must be understandable, maintainable and safe for the people operating it. Training, access, disruption, noise, local air quality and confidence in support can be as important as equipment performance.
The Goal
Turn the challenge into measurable project requirements.
The goal is to deliver the required service with a practical combination of efficiency, electrification, renewable energy, storage, hydrogen and operational controls—not to maximise any one technology.
Information to establish early
Collect renewable time series, connection limits, electricity value, water quality, annual kilograms, pressure, storage and demand profile.
- Define the required output, operating pattern and acceptable interruption.
- Separate peak capacity from total daily or annual energy.
- Record present costs, constraints and service problems.
- Identify safety, consent, access and workforce requirements.
- Agree measurable performance, emissions and commercial outcomes.
Understanding the Technology
Follow the complete energy and hydrogen pathway.
The plant includes electricity supply and power electronics, water treatment, electrolyser, drying, compression, storage, controls and the end-use interface.
01
Primary input
Identify the electricity, renewable resource, delivered fuel, water or existing process input and when it is available.
02
Hydrogen supply
Define production or delivery, hydrogen quality, pressure, usable kilograms, storage duration and replenishment.
03
Conversion and control
Select equipment around useful output, response, efficiency, operating hours, redundancy and integration with existing assets.
04
Final service
Measure the useful transport, electricity, heat or industrial service actually delivered to the user.
Important: equipment ratings describe only part of a solution. The system boundary must include energy supply, conversion losses, auxiliaries, storage, delivery and the operating reserve.
What are the Options?
Compare hydrogen with direct electrification and established alternatives.
Where hydrogen may fit
Renewable hydrogen is relevant where the hydrogen has a clear end use and production timing can be coordinated with available low-emissions electricity.
Where another pathway may be better
Direct electrification will usually use renewable electricity more efficiently where the final service can be electrified.
Decision principle: compare complete systems against the same operating requirement, site conditions, safety obligations, emissions boundary and lifecycle period.
Typical Use Cases
Look first for demanding applications with a clear service value.
New Zealand has a highly renewable electricity system and site-specific wind, solar, hydro and geothermal opportunities, but electricity still has competing direct uses.
Geothermal hydrogen
Steady renewable electricity can support high electrolyser utilisation and predictable production.
Wind and solar hydrogen
Variable generation may reduce electricity cost at selected times but requires flexible operation and more storage.
Industrial and transport hubs
Co-locating production with committed demand can reduce transport cost and improve infrastructure utilisation.
Solution Size
Size the service, energy pathway and reserve together.
Electrolyser output follows available power, minimum load, starts, storage capacity and the required hydrogen delivery schedule.
A 1.5 MW electrolyser is already operating at Mōkai. Proposed industrial facilities are much larger; water, power connection, annual utilisation and contracted kilograms govern scale.
| Measure | Why it matters | Evidence to collect |
|---|---|---|
| Maximum output | Sets peak equipment and connection capacity. | Measured peaks, route demand, starting loads or process rate. |
| Useful energy | Determines fuel, storage and replenishment. | Hourly, daily, seasonal or route-level consumption. |
| Operating window | Shapes utilisation, recovery and maintenance. | Shifts, dwell time, event duration and annual hours. |
| Reserve and redundancy | Protects service through credible failures or delays. | Criticality, outage tolerance, alternative supply and resupply time. |
These measures structure an initial conversation; they are not a design or equipment recommendation.
Benefits and Limitations
Understand both the potential value and the hard constraints.
Potential benefits
Potential value includes low-emissions fuel, flexible production and use of renewable energy across transport, industry and resilience.
Limitations to resolve
Electricity cost, utilisation, water treatment, compression, conversion loss, offtake certainty and certification are key constraints.
Practical Considerations
Plan the site, supply chain and operating organisation.
Size production and storage together so the electrolyser can operate when electricity is available while hydrogen demand is served when required.
Site and access
Confirm space, access, foundations, ventilation, weather exposure, security, vehicle movements and future expansion.
Operations
Define trained roles, monitoring, inspections, planned maintenance, spare parts, alarms and emergency response.
Supply resilience
Test production or delivery capacity, hydrogen quality, refill intervals, route disruption, reserve and recovery after an event.
Safety
Use application-specific design, controls and competent advice.
Production sites require appropriate electrical, gas, pressure, ventilation, separation, water, consenting and emergency arrangements.
Hazard controls
Address loss of containment, ignition, ventilation, pressure, impact, electrical hazards, hazardous areas and emergency isolation.
People and procedures
Define competence, training, inspection, permits, signage, access control, incident response and communication with emergency services.
Site-specific compliance
Applicable requirements depend on quantities, pressure, equipment, location and activity. Separation distances and approvals cannot be selected from a generic web page.
Commercial Considerations
Compare the cost of delivering the required service.
Model levelised hydrogen cost using realistic electricity prices, operating hours, stack life, compression, storage and contracted demand.
Capital
Equipment, civil works, connection, storage, controls, consent, engineering and contingency.
Operating
Electricity, hydrogen, delivery, labour, maintenance, inspections, consumables and replacement parts.
Utilisation
Annual output, shared infrastructure, contracted demand and the effect of idle capacity on unit cost.
Value and risk
Avoided downtime, emissions, noise, constrained infrastructure, fuel volatility, residual value and technology maturity.
New Zealand Examples
Use verified local evidence and state project maturity clearly.
New Zealand hydrogen activity includes operational trials, demonstrations, commercial proposals and developing supply chains. Examples added to this page should identify what operated, where, for how long, the measured output and the source of the claim.
Operating production plant
Halcyon Power 1.5 MW Mōkai plant
MBIE records the 1.5 MW Halcyon Power green-hydrogen plant beside Tuaropaki Trust's 110 MW Mōkai geothermal station as an operating New Zealand production example.
Read the MBIE reportUnder construction
South Taranaki green-hydrogen project
Construction began in 2026 on the up-to-.3 million Kapuni project linking wind electricity, Ballance site demand and green hydrogen for Hiringa refuelling operations.
Read the project announcementApplication Evidence
What these examples establish
Mōkai is operating; Kapuni is under construction and should not yet be described as operating output. Both show the importance of linking renewable supply to identified hydrogen demand.
Project Process
Progress from interest to an evidence-based proposal.
01
Discovery
Confirm the service problem, stakeholders, timing, present system and reasons for considering change.
02
Measure
Collect operating data, site constraints, supply information, safety requirements and commercial assumptions.
03
Compare
Screen credible pathways on the same system boundary and document exclusions, sensitivity and uncertainty.
04
Develop
Complete concept design, stakeholder engagement, approvals, procurement, implementation and performance verification.
Suitable Products
Build the system from compatible supply, storage and conversion components.
Product suitability depends on the measured requirement and complete system design. Review the current ranges as starting points rather than standalone recommendations.
Hydrogen supply and production
Review electrolyser and supply options around required quality, production rate and operating schedule.
Explore product rangesStorage and delivery
Match usable kilograms, pressure, refill route, transport and reserve to the operating requirement.
Explore storage productsFuel-cell power and integration
Coordinate continuous power, transient response, batteries, inverters, controls and monitoring.
Explore power systemsFAQ
Common early questions.
Is hydrogen automatically the best low-emissions option?
No. Direct electrification will usually use renewable electricity more efficiently where the final service can be electrified. The correct comparison uses the same final service, site conditions, reliability and lifecycle boundary.
What information is needed before selecting equipment?
Collect renewable time series, connection limits, electricity value, water quality, annual kilograms, pressure, storage and demand profile.
Where can hydrogen add value?
Renewable hydrogen is relevant where the hydrogen has a clear end use and production timing can be coordinated with available low-emissions electricity.
What usually has the greatest effect on project cost?
Model levelised hydrogen cost using realistic electricity prices, operating hours, stack life, compression, storage and contracted demand.
Can this page be used to determine safety distances?
No. Required controls and separation distances depend on the actual inventory, pressure, equipment, activity and site. Use current requirements and appropriately competent project specialists.
Scope and Limitations
Use this page for orientation, not final design or professional advice.
This material is general information for early customer and project conversations. It does not replace engineering, financial, legal, safety, environmental or regulatory advice. Technology performance, prices, hydrogen availability, standards and legal requirements change; verify current information for the actual New Zealand site and proposed activity.
Further Reading
Continue with authoritative and current information.
Project Support
Define the requirement before selecting equipment.
Share the operating requirement, location, timing and constraints so the next questions and evidence can be identified.