What Tuwharetoa Geothermal does

Tūwharetoa Geothermal, operating as Ngati Tuwharetoa Geothermal Assets Ltd (NTGA), is a private, iwi-owned wholesale geothermal process heat supplier headquartered in Kawerau, Bay of Plenty, New Zealand. The company has supplied renewable geothermal energy and process steam to the Kawerau Industrial Complex — described as the largest industrial geothermal process heat user in the world — continuously since 1955. Its primary customer base comprises enterprise-scale industrial users in pulp and paper (OJI, Essity), timber (CHHWP, Sequal), dairy processing (Waiu Dairy), and geothermal power generation (Eastland Generation), all anchored via long-term supply relationships within a single industrial complex.

The company's core technology is the extraction and management of geothermal fluid from the Kawerau Geothermal System in the Taupō Volcanic Zone. Operations are enabled by 14 in-service wells, locally developed steam-water separators, and clean steam plants that deliver process steam at 7-16 bar (approximately 2.8 GJ per tonne) and process water at 170°C (approximately 0.7 GJ per tonne), with the company holding consents for 10.7 PJ of geothermal energy capacity. Reservoir management is supported by a state-of-the-art numerical simulation model used to analyze sustainability of current and future operations, and the company reports emissions intensity of 0.007 tCO2(eq) per GJ versus 0.054 tCO2(eq) per GJ for LNG.

The business model is a B2B wholesale subscription/recurring supply operation, monetizing geothermal process steam and water delivered through dedicated pipeline infrastructure to industrial customers. Distribution is direct, single-geography (Bay of Plenty / North Island, New Zealand), with no digital channel or SaaS component. Recent commercial activity — including the 2025 commissioning of the TOPP2 geothermal plant with Eastland Generation, expansion of the OJI Tasman Mill supply relationship, and active development of new industrial land blocks at the Kawerau Industrial Complex — indicates a strategy of deepening the existing customer base and onboarding new industrial tenants onto the existing geothermal network rather than entering new geographies or product categories.

Name

Tuwharetoa Geothermal

Legal name

Ngati Tuwharetoa Geothermal Assets Ltd (NTGA)

Website

https://tuwharetoageothermal.co.nz

Company type

Private

Founded year

1955

Operating status

Operating

Headcount range

11–50 employees

Short description

Tūwharetoa Geothermal (NTGA) is an iwi-owned wholesale geothermal process heat supplier in Kawerau, New Zealand, delivering steam and hot water to industrial customers in the Kawerau Industrial Complex since 1955. It serves enterprise users in pulp/paper, timber, dairy, and power generation via long-term supply contracts.

Ownership category

akta.pro rank

Product category

Geothermal Industrial Process Heat

NAICS

Steam and Air-Conditioning Supply (221330), Geothermal Electric Power Generation (221116)

SIC

Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

Geothermal Direct Use Heat Projects (District Heating, Greenhouses, Aquaculture, Industrial Heat) (EUAMAEAG)

akta.pro secondary industries

Geothermal Brine Management & Reinjection for Power Plants (EUACAHAJ), Geothermal Wellfield & Steamfield Operations for Power (EUACAHAI)

Keywords

• Geothermal process heat
• Industrial steam supply
• Renewable energy
• Geothermal well operations
• Low-carbon process heat

Headquarters

HQ city

Kawerau

HQ country

New Zealand

HQ region

Oceania

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Operations, Infrastructure, Personnel, Technology or R&D, Others

Revenue model

1. Geothermal Process Steam Supply: Wholesale supply of geothermal process steam at pressures of 7 to 16 bar (approximately 2.8 GJ of thermal energy per tonne of steam) to industrial customers. Long-term supply relationships with energy providers and process industries in Kawerau Industrial Complex.
2. Geothermal Process Water Supply: Supply of process water at 170 degC (7 bar), with approximately 0.7 GJ of thermal energy per tonne of water to industrial customers.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Tūwharetoa Geothermal supplies wholesale geothermal process steam (7-16 bar; up to 9-22 bar via steam-water separators), clean steam (13-17 bar, geothermal-gas-free), and geothermal process water (170°C at 7 bar) to industrial customers in the Kawerau Industrial Complex. It also provides access to the Kawerau Industrial Complex for new industrial developments and a geothermal site safety induction service. Operations are powered by 14 in-service wells extracting thermal energy from the Kawerau Geothermal System in the Taupō Volcanic Zone.

Product overview

Tūwharetoa Geothermal operates as a wholesale geothermal steam and brine supply business, providing renewable geothermal energy products to industrial customers in Kawerau. The company's core product portfolio consists of geothermal process steam (7-16 bar, with steam-water separator options at 9-22 bar), clean steam (13-17 bar, geothermal gas-free), and process water (170°C at 7 bar). The company also offers access to the Kawerau Industrial Complex for new industrial developments, and provides site safety induction services. These products collectively serve industrial clients requiring reliable, low-carbon process heat energy.

Differentiator

Problem solved

Functional benefit

Products and services

• Geothermal Process Steam Geothermal process steam supplied at pressures of 7 to 16 bar, with approximately 2.8 GJ of thermal energy per tonne of steam. Also available at 9-22 bar pressure through steam-water separators. Sold wholesale to industrial customers for process heat applications.
• Clean Steam Geothermal process steam without geothermal gases, available at 13-17 bar pressure for industrial applications such as tissue paper manufacture where purified steam is required.
• Geothermal Process Water Process water supplied at a temperature of 170°C (7 bar), with approximately 0.7 GJ of thermal energy per tonne of water, for industrial customers requiring hot water for process heat applications.
• Kawerau Industrial Complex Access Access to the Kawerau Industrial Complex (the largest industrial geothermal process heat user in the world), offering industrial land opportunities and symbiotic relationships with process industries and geothermal power plants for businesses seeking a low-carbon location.
• Geothermal Site Safety Induction Mandatory safety induction service for personnel accessing Ngati Tuwharetoa Geothermal Assets sites, delivered via an online induction portal.

Quantifiable outcome

• 90% less carbon emissions compared to gas-raised steam (CO2 from geothermal steam is approximately 10% of gas-raised steam equivalent)
• +3 more outcomes

Named customers6 records

Segments1 record

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Six partnerships are on record, tiered core.

• Eastland GenerationcoreStrategic or Co-development PartnerEastland Generation owns and operates four geothermal plants and a hydro station in the North Island. Ngāti Tūwharetoa Geothermal Assets provides long-term supply of geothermal heat to TOPP1 and TOPP2 geothermal plants, and also manages the wells and steam fields.
• OJIcoreStrategic or Co-development PartnerOJI uses geothermal process heat as a significant part of the Tasman Mill's transformation project, reducing greenhouse gas emissions from the Mill by 10,000 tonnes of CO2(eq) per year.
• EssitycoreStrategic or Co-development PartnerEssity uses geothermal clean steam for tissue paper manufacture, resulting in significant reductions in greenhouse gas emissions and an environmentally friendlier product.
• CHHWP (Carter Holt Harvey Woodproducts)coreStrategic or Co-development PartnerCHHWP uses geothermal process steam at the Kawerau Mill to produce a range of structural and outdoor timber products using sustainably grown New Zealand radiata pine.
• SequalcoreStrategic or Co-development PartnerSequal uses geothermal process steam to dry custom-cut New Zealand radiata pine lumber used in the manufacture of furniture, packaging and engineered wood products.
• Waiu DairycoreStrategic or Co-development PartnerWaiu Dairy uses geothermal clean steam for dairy processing.

Scale indicators6 records

Recent moves6 records

Expansion highlights3 records

Broad incumbents

• Calpine Corporation: US-based independent power producer with the largest geothermal portfolio in the US, including The Geysers complex in California. Comparable as a major geothermal incumbent at scale, though oriented to electricity rather than direct industrial heat.
• Pertamina Geothermal Energy: Indonesia's largest geothermal developer and operator with extensive assets across the Indonesian volcanic arc. Comparable as a major state-affiliated geothermal operator in a Pacific volcanic setting.
• Mercury NZ: NZ-listed renewables major with substantial geothermal generation capacity from the Taupō Volcanic Zone. Comparable as a NZ geothermal incumbent operating in the same volcanic zone, although its scale and electricity focus differ from NTGA's industrial heat model.
• KenGen: Kenya's dominant geothermal generation operator at the Olkaria field in the East African Rift. Comparable as a national-scale geothermal incumbent leveraging a major volcanic rift system, although electricity-focused rather than industrial process heat.
• Contact Energy: Largest NZ-listed renewable electricity generator with significant geothermal assets in the Taupō Volcanic Zone. Comparable as a NZ geothermal operator leveraging the same volcanic resource system, though Contact focuses on electricity generation rather than direct industrial process heat.
• Ormat Technologies: Global geothermal equipment manufacturer and independent power producer with binary and flash plant technology deployed worldwide. Comparable as a global geothermal incumbent across both equipment supply and IPP operations.
• Energy Development Corporation: Philippines-based geothermal power major with one of the largest installed geothermal capacities in the world. Comparable as a large established geothermal generation operator in a Pacific Rim volcanic belt.

Regional players

• HS Orka: Icelandic geothermal operator producing power and hot water for industrial and district heating use. Comparable as a direct-use geothermal heat supplier and electricity producer, though based in Iceland rather than NZ.
• Top Energy: NZ geothermal and electricity operator running the Ngāwhā geothermal field in Northland. Comparable as another iwi-adjacent NZ geothermal energy producer, although geographically separate from Kawerau and primarily generation-focused.

Others

• Eastland Generation: NTGA's primary geothermal power generation customer and partner; operates four geothermal plants and a hydro station receiving long-term heat supply from NTGA. Included as an ecosystem participant tightly coupled to NTGA's revenue base.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/ngati-tuwharetoa-geothermal-assets-ltd

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Tuwharetoa Geothermal