Ocean energy, marine energy and wave power.
These terms overlap, but they do not all mean the same thing. Ocean Energy Systems describes energy resources in waves, tides and currents, temperature differences and salinity differences. Each requires a different technology and a different assessment of place.
| Resource | What provides the energy? | Where Ngaru fits |
|---|---|---|
| Wave energy | The movement and energy of ocean waves. | Ngaru’s development focus. |
| Tidal and current energy | Changing water levels and moving water. | A different resource and technology pathway. |
| Ocean thermal energy | Temperature differences between warmer surface water and colder deeper water. | Part of the broader ocean energy sector. |
| Salinity gradient energy | Differences in salt concentration, such as where fresh and salt water meet. | Part of the broader ocean energy sector. |
Why the New Zealand context matters.
Ocean energy is developed in a particular place. A technology that suits one coast may not suit another. Local resource conditions, marine users, ecological values, infrastructure and community relationships all shape a potential project.
For Ngaru, the work is about building a credible wave-energy pathway in Aotearoa, with iwi, industry, research, government and investment conversations informing its development. A useful starting point is a shared understanding of what is known, what remains to be tested and what evidence the next decision requires.
How ocean energy could fit the wider energy system.
A new generation source needs to be assessed as part of an electricity system. The timing of production, grid access, demand, storage and other generation all matter. Ngaru’s system-value page explores this question for wave energy.
Potential value should be supported by project data and independent assessment. It should not be assumed from the size of the ocean resource or from another country’s project.
Who needs to be part of the conversation?
Potential participants include mana whenua, coastal communities, electricity buyers, network and infrastructure organisations, marine and manufacturing suppliers, research teams and development capital partners. Their roles and commitments need to be defined for each project.
Further reading.
- Ocean Energy Systems — New Zealand country information
- MBIE — offshore renewable energy in New Zealand
- NIWA — New Zealand wave and tidal resources
External information can change. Use the original source for current policy or technology details. A reference is not an endorsement of Ngaru by that organisation.
Prepared by Ngaru Energy Group. External reference links checked 18 October 2026.