CAUSEWAY GEOTHERMAL (NI) LTD

What CAUSEWAY GEOTHERMAL (NI) LTD does

Causeway Geothermal (NI) Ltd, trading as Causeway Energies, is a private geothermal technology and services company founded in June 2021 by energy-industry veterans Dr Simon Todd, Dr Niall McCormack, and Brian O'Cathain, and incorporated in both Northern Ireland (Belfast, Reg. NI675283) and the Republic of Ireland (Dublin, Reg. 684587), with a third office in Houston, Texas. The company develops and delivers geothermal heat pump systems, subsurface thermal-energy storage, and project-financing structures for industrial and commercial heat customers across Ireland, the UK, and the US, targeting sectors including data centres, hospitals, breweries, food processing, pharmaceuticals, municipal buildings, and district heating networks. Its technology stack combines shallow and deep geothermal systems — open-loop hydrothermal aquifers, closed-loop borehole heat exchangers, and Standing Column Wells — with proprietary industrial heat pumps (including a patented supercritical CO2 cycle developed with Southwest Research Institute, US patent granted 12 August 2025) and thermal storage architectures branded Deep GHP, GeoBattery, GeoLoop, and GeoSolar.

The company's commercial offering comprises three service tiers: Consult (energy-challenge assessment and preliminary design), Design and Build (full engineering, construction, and deployment), and Heat-as-a-Service (HaaS), in which green-finance partners fund upfront capital and customers pay a multi-decade tariff covering capital, running costs, and the company's markup. Revenue mechanics therefore span professional services fees, one-time design-and-build contracts, and long-duration recurring subscriptions once HaaS projects reach operation. Customer engagement is enterprise field-sales led and consultative, supported by content marketing, conference presence, industry coalitions (EGEC, GeothermalUK, Geothermal Association of Ireland), and partnerships with Baker Hughes and Europa Oil & Gas (West Firsby test site). As of the most recent disclosures the company remains pre-scale on revenue (1-10 employees, no disclosed funding rounds, most disclosed engagements in feasibility or design phase), positioning Causeway as an early-stage specialist whose commercial trajectory depends on converting its current feasibility pipeline into HaaS-backed build contracts.

Name

CAUSEWAY GEOTHERMAL (NI) LTD

Legal name

Causeway Geothermal (NI) Ltd

Website

https://causewaygt.com

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

1–10 employees

Short description

Causeway Energies is a private geothermal technology and services company, founded 2021 in Ireland and Northern Ireland, that develops geothermal heat pump systems, proprietary thermal storage architectures, and Heat-as-a-Service financing for industrial and commercial heat customers across Ireland, the UK, and the US.

Ownership category

akta.pro rank

Product category

Geothermal Energy Services

NAICS

Heating Equipment (except Warm Air Furnaces) Manufacturing (333414)

SIC

Oil & Gas Field Exploration Services (1382)

akta.pro primary industry

Geothermal Reservoir Engineering & Wellfield Management (Modeling, Stimulation, Reinjection Strategy) (EUAMAEAC)

akta.pro secondary industries

Geothermal Equipment & Component Manufacturing (Turbines, Heat Exchangers, Pumps, ORC Units) (EUAMAEAI), Geothermal Environmental & Regulatory Services (Permitting, Monitoring, Induced Seismicity, Water Management) (EUAMAEAL), Geothermal BOP & Surface Facilities (Well Pads, Gathering Systems, Brine Handling) (EUAMAFAH)

Keywords

• Geothermal heat pumps
• Industrial heat decarbonisation
• Deep geothermal systems
• Heat-as-a-service
• Thermal energy storage

Headquarters

HQ city

Belfast

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Consulting Services: Causeway Energies offers 'Consult' services to assess and provide preliminary designs for low/zero carbon energy systems. This is the entry point in the customer engagement process, helping customers understand their energy challenge and potential geothermal solutions.
2. Design and Build: The 'Design and Build' service takes the concept from preliminary design through to final design and installation. This is a project-based, one-time service covering full engineering, construction, testing and deployment.
3. Heat-as-a-Service (HaaS): A novel financing approach where Causeway assesses the customer's needs, designs the energy solution, and green finance (investors/lenders) provides the upfront capital. The customer pays a regular tariff or subscription covering capital costs, running costs, and Causeway's markup over the life of the project (measured in decades). The customer avoids upfront capital outlay and typically pays similar or better energy expenses versus their previous fossil fuel system.
4. Self-Funded Installation: A traditional arrangement where Causeway installs the system at the customer's expense and the customer operates it day-to-day, with periodic checks on surface equipment. A typical self-fund option for customers who prefer to own the system outright.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels7 records

Core offering

Causeway Energies (CAUSEWAY GT) consults, designs, builds, and finances geothermal heat pump and thermal energy storage systems for industrial and commercial customers. Its portfolio spans shallow and deep geothermal boreholes, closed-loop and open-loop systems, industrial heat pumps, and Heat-as-a-Service (HaaS) financing under which green-finance partners fund the upfront capital and customers pay a multi-decade tariff.

Product overview

Causeway Energies is a geothermal energy technology and services company offering a portfolio of solutions centered on geothermal energy and heat pumps for industrial and commercial customers. The core offering comprises Consult (assessment services), Design and Build (installation services), and Heat-as-a-Service (financing model). These are supported by proprietary technology products including Deep GHP (Deep Geothermal Heat Pump) for MW-scale higher-temperature applications, GeoSolar (geothermal + solar thermal), GeoBattery (seasonal waste heat storage), GeoLoop (hybrid open-loop system), and Standing Column Well systems. The company also provides closed-loop and open-loop geothermal borehole systems, industrial heat pumps, and thermal energy storage solutions (BTES and ATES). Their systems deliver heating and cooling for sectors including places/buildings, agriculture/food/beverage, pharmaceutical manufacturing, and water/natural resources.

Differentiator

Problem solved

Functional benefit

Brands

• Deep GHP: Proprietary Deep Geothermal Heat Pump system for higher temperature heat and higher thermal powers
• GeoSolar
• GeoBattery
• GeoLoop

Products and services

• Consult
• Design and Build
• Heat-as-a-Service (HaaS)
• Deep GHP (Deep Geothermal Heat Pump) Proprietary deep geothermal heat pump system for MW-scale, higher-temperature heat. Uses open-loop hydrothermal aquifers or closed-loop borehole heat exchangers at depths of approximately 500m to 1km, designed to deliver temperatures competitive with fossil fuels at industrial scale.
• GeoBattery thermal energy storage Underground thermal energy storage system that captures waste heat from summer cooling or industrial processes for use in winter peak-demand season. Enables seasonal offset of heating and cooling loads in systems with both heating and cooling demand.
• GeoLoop hybrid open/closed loop system Hybrid set-open loop geothermal system that reduces the need for closed-loop boreholes by as much as 90% and operates where the hydrothermal resource is not good enough for conventional open-loop systems.
• GeoSolar geothermal-solar hybrid Integrated system combining geothermal with solar thermal or hybrid solar photovoltaic thermal (Solar PVT) to balance variable/intermittent solar generation and recharge the geothermal resource.
• Standing Column Well (SCW) system Semi-open loop geothermal system that uses both conduction and advection to transfer heat, delivering 3-5x the thermal power of pure closed loops at lower capital cost. Introduced to the UK and Ireland through a 2025 research and demonstration project funded by the Northern Ireland Department for the Economy.
• Closed-Loop Geothermal Systems Geothermal heat-harvesting systems where heat is transferred via conduction into U-tube or coaxial tubing in boreholes containing circulating fluid, with no fluid exchange between rocks and the borehole.
• Open-Loop Geothermal Systems Aquifer-based geothermal systems where water is produced from the subsurface, heat is extracted via heat pumps, and the water is then re-injected into the rocks. More efficient than closed-loop but requires careful aquifer management.
• Industrial Heat Pumps Large-scale heat pumps (hundreds of kW to MW) that lift source temperatures by up to 80°C, with proprietary technology targeting outputs up to 160°C at COPs greater than 2.5. Includes a US-patented novel supercritical CO2 (sCO2) heat pump cycle developed with Southwest Research Institute (SwRI).
• Borehole Thermal Energy Storage (BTES) Seasonal thermal energy storage in borehole arrays enabling storage of summer heat for winter use, with 80-90% round-trip efficiency in shallow geothermal configurations.
• Aquifer Thermal Energy Storage (ATES) Seasonal thermal energy storage in permeable rock aquifers allowing injection and recovery of thermal energy across seasons.
• Subsurface simulation and geothermal resource modelling Geological and thermal performance modelling service that characterises geothermal resources and predicts their thermal performance over decades, underpinning system design and project feasibility assessments.

Quantifiable outcome

• 10x less GHG emissions than gas-fired system; approaching 100x as electricity decarbonises (using Irish/British grid electricity)
• +8 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• GeothermalUKcoreStrategic or Co-development Partner · 16 June 2025New coalition launched in June 2025 to promote and unlock UK's geothermal potential. Coalition comprises developers, experts, and public bodies. Causeway Energies is part of this coalition to advance geothermal energy in the UK market.
• University College Dublin (UCD) — GEONORM ConsortiumminorStrategic or Co-development Partner · 1 January 2025Causeway Energies is part of a consortium examining the opportunity to bring geothermal energy to the 2-5 MW district heating network at UCD's Belfield Campus. Causeway's contribution is exploration and assessment of different geothermal borehole types.
• Department for the Economy, Northern IrelandminorOthers · 1 January 2025Funded the Standing Column Well research project and deep geothermal well potential modeling project. Awarded a Department for the Economy energy research open call grant to research the potential of Standing Column Well technology in Northern Ireland, which had not previously been applied for shallow geothermal energy utilisation in the UK and Ireland.
• Baker HughescoreStrategic or Co-development Partner · 21 December 2021Baker Hughes and Causeway Energies entered into a collaboration to work together on geothermal energy projects and technology development. The partnership was announced in December 2021, with Baker Hughes being a major energy technology company bringing complementary capabilities to Causeway's geothermal solutions.
• Ulster University / CASE ProjectminorStrategic or Co-development Partner · 1 November 2021Research project (DDCGE) funded through CASE completed at Ulster University. Causeway made in-kind contributions including analysis of geothermal resources and modeling of Underground Thermal Energy Storage for decarbonising data centres.
• Europa Oil & Gas Holdings plccoreStrategic or Co-development Partner · 28 June 2021MOU signed with Europa Oil & Gas to assess West Firsby oil field as a geothermal test and commercial deployment site. West Firsby is considered ideal due to its comprehensive dataset, existing well bores (9 wellbores, 7 wellheads over 2.5 km² to 1,680m depth), and geothermal gradient. The 2-year study involves desktop studies and test designs to assess West Firsby as a test site, calibrating dynamic modelling of Causeway's geothermal energy system.
• Geothermal Association of IrelandcoreStrategic or Co-development PartnerNiall McCormack, Co-Founder of Causeway Energies, serves as Chair of the Geothermal Association of Ireland, an industry body that advocates for geothermal energy policy and development in Ireland.
• Southwest Research Institute (SwRI)coreTechnology or IntegrationPartnership with SwRI to design a novel heat pump cycle using supercritical CO2 (sCO2) as refrigerant. The collaboration designed a heat pump cycle that raises temperature by 100K or more and can take 25°C source heat and upgrade to as much as 150°C, with two novel components to maximise thermal efficiency and COP.
• EGEC (European Geothermal Energy Council)minorStrategic or Co-development PartnerCauseway Energies supports EGEC's call for a European Geothermal Strategy by 2023. Active member of EGEC which published a compendium of 29 case studies of geothermal in industry and agrifood (2025).

Scale indicators9 records

Recent moves7 records

Expansion highlights7 records

Direct peers

• Geothermal Engineering Ltd: Geothermal Engineering Ltd is a UK-based deep geothermal developer operating the United Downs Deep Geothermal Power project in Cornwall. It is a direct UK/regional peer pursuing deep geothermal for industrial and commercial applications.
• Fervo Energy: Fervo Energy is a US-enhanced geothermal systems (EGS) company using horizontal drilling and advanced heat pumps to deliver carbon-free power and industrial heat. It targets the same sub-200°C industrial heat opportunity as Causeway using deep geothermal, with a similar technology stack.
• Kensa Heat Pumps: Kensa is a UK manufacturer and installer of ground-source heat pumps for residential and commercial heat networks. It is a direct competitor in the shallow geothermal heat pump segment that Causeway is also targeting with closed-loop and Deep GHP systems.
• Sage Geosystems: Sage Geosystems is a US geothermal 2.0 developer using closed-loop and pressure-cycling systems to deliver baseload clean power and heat. Causeway was profiled alongside Sage in a WIRED article on next-generation geothermal pioneers, validating them as co-equals in the advanced geothermal space.
• Eavor Technologies: Eavor is a Canadian advanced geothermal company developing closed-loop geothermal systems (Eavor-Loop) for industrial heat and power. It is the most direct analogue to Causeway's Deep GHP and GeoLoop borehole architectures, both targeting scalable deep geothermal for industrial customers.
• Innargi: Innargi is a Danish geothermal district heating developer operating deep geothermal plants for municipal heat networks across Europe. It is a peer in deep geothermal for district heating, the same end-use case Causeway is pursuing with HaaS and UCD's Belfield campus project.

Emerging players

• Rondo Energy: Rondo Energy provides industrial heat battery and electrified heat solutions to decarbonise industrial steam and process heat. It is an emerging peer competing for the same industrial heat decarbonisation budget as Causeway, though via thermal storage rather than geothermal.
• Eden Geothermal: Eden Geothermal is a UK deep geothermal project in Cornwall developing a 4-5 MW demonstration plant for combined heat and power. It is an emerging UK peer in deep geothermal targeting industrial and district heat users.

Regional players

• Reykjavik Geothermal: Reykjavik Geothermal is an Iceland-based developer of high-enthalpy geothermal power and heat projects internationally. It is a regional player in the same deep geothermal development space, though primarily focused on Iceland and high-temperature resources rather than Causeway's moderate-depth niche.

Broad incumbents

• Ormat Technologies: Ormat is a US-Israeli geothermal incumbent and equipment manufacturer with hundreds of MW of installed geothermal power capacity worldwide. It is a broad incumbent whose equipment, operations, and balance sheet set the competitive benchmark Causeway must differentiate against.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/causewayenergies

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

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 →

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