Ireland has taken another major step toward financing its energy transition after the Ireland Strategic Investment Fund (ISIF) committed up to €140 million as a cornerstone investor in a new climate infrastructure fund launched by TirNua Capital Partners.

The investment is expected to accelerate funding for renewable energy, green infrastructure and low-carbon technologies across the country, helping Ireland advance its national climate goals while attracting additional institutional capital.

The new fund has already secured €340 million in commitments, with ISIF’s participation providing the anchor investment intended to attract pension funds, insurance companies and other long-term investors.

Officials say the initiative represents a significant step in mobilising private capital for climate-related infrastructure projects at a time when governments across Europe are seeking to scale investment in clean energy systems.

By combining public investment with institutional capital, the fund aims to support projects that can drive both environmental impact and long-term economic growth.

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TirNua Capital Partners: A New Platform for Climate Investment

The climate infrastructure fund is being managed by TirNua Capital Partners, a newly established private markets investment manager created to channel long-term capital into projects supporting Ireland’s decarbonisation efforts.

TirNua was formed through a partnership between Irish Life Investment Managers (ILIM) and Northleaf Capital Partners, a global investment firm specialising in infrastructure, private equity and private credit.

The platform is structured as an independent, employee-managed investment manager, allowing it to focus specifically on climate infrastructure opportunities while leveraging the financial expertise and global networks of its founding partners.

Irish Life Investment Managers is one of Ireland’s largest asset management firms, while Northleaf Capital Partners brings experience managing infrastructure investments around the world.

Together, the firms aim to create a dedicated investment platform capable of attracting global institutional capital into Ireland’s rapidly expanding clean energy sector.

TirNua has also assembled an Ireland-based investment team led by Chief Executive David O’Brien, who previously served as co-head of infrastructure investments at BlackRock and earlier worked as chief financial officer at renewable energy company NTR.

The leadership team’s experience in infrastructure finance and renewable energy development is expected to help identify and manage large-scale climate investment opportunities across the country.

Fund Targets Infrastructure Driving Ireland’s Energy Transition

The new climate action infrastructure fund will focus primarily on assets supporting the country’s shift toward a low-carbon energy system.

Investment targets include a wide range of sectors essential to decarbonising Ireland’s economy.

Key investment areas include:

• Renewable power generation
• Battery energy storage systems
• Data centre decarbonisation technologies
• Offshore wind support services
• Building energy efficiency projects
• Biogas and renewable fuel production
• Green transport infrastructure

By targeting multiple sectors, the fund aims to support the development of integrated clean energy systems while addressing several of the major challenges associated with energy transition.

Infrastructure investments are particularly important in the transition to renewable energy because they enable the deployment and operation of new energy technologies at scale.

For example, battery storage facilities help balance electricity supply and demand when renewable generation fluctuates, while grid upgrades and efficiency improvements reduce overall energy consumption.

Majority of Investments Will Be Deployed in Ireland

At least 60 percent of the fund’s capital is expected to be invested directly in Ireland, ensuring that the majority of projects financed through the initiative support domestic energy transition goals.

This focus on local investment reflects the Irish government’s strategy of using public funds to catalyse private sector participation in climate infrastructure projects.

By anchoring the fund with public investment from ISIF, policymakers hope to attract additional institutional investors who may otherwise hesitate to invest in early-stage or complex infrastructure projects.

Such blended finance approaches are increasingly used around the world to mobilise capital for climate projects that require large upfront investment but deliver long-term economic and environmental benefits.

ISIF’s Expanding Climate Investment Programme

The Ireland Strategic Investment Fund has played a central role in financing climate infrastructure projects across the country.

ISIF is a sovereign investment fund managed by the National Treasury Management Agency (NTMA) and is tasked with investing public funds in ways that generate both commercial returns and broader economic benefits for Ireland.

In recent years, the fund has significantly expanded its climate investment activities as part of Ireland’s national decarbonisation strategy.

ISIF previously set a €1 billion climate action investment target, which it successfully reached in 2025 — two years ahead of schedule.

Following that milestone, the fund announced plans to double its climate investment programme, committing to deploy an additional €1 billion between 2025 and 2029.

The investment in TirNua’s climate infrastructure fund forms part of this expanded programme.

Officials say the fund will help mobilise additional capital from institutional investors while supporting projects that contribute directly to the country’s Climate Action Plan.

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Government Support for Climate Infrastructure

Irish government officials have welcomed the investment as an important step in advancing the country’s climate strategy.

Tánaiste and Minister for Finance Simon Harris said the investment demonstrates how public capital can be used to accelerate climate action while supporting economic development.

“I very much welcome today’s announcement by ISIF of €140 million — an investment that will help drive progress in the crucial area of climate action,” Harris said.

“This joint venture is the latest example of ISIF backing projects that contribute significantly to delivering the Government’s Climate Action Plan.”

The Climate Action Plan is Ireland’s national roadmap for reducing greenhouse gas emissions and transitioning toward a more sustainable energy system.

Under the plan, Ireland aims to significantly increase renewable energy generation, electrify transport systems and improve energy efficiency across industries and buildings.

Large-scale infrastructure investment will be essential to achieving these goals.

Catalysing Investment from Institutional Investors

One of the key objectives of the TirNua fund is to attract investment from large institutional investors such as pension funds and insurance companies.

These investors typically seek long-term assets that provide stable returns while aligning with sustainability goals.

Infrastructure projects related to renewable energy and clean transport often meet these criteria because they generate predictable revenue streams over long operating periods.

Rebekah Brady, Interim Director of ISIF, said the TirNua fund represents a new platform capable of mobilising capital from institutional investors interested in supporting the energy transition.

“This commitment to TirNua’s fund is a strong example of how ISIF’s climate investment programme is supporting the Government’s Climate Action Plan,” Brady said.

“TirNua is a pioneering Irish platform which will seek to catalyse investment from pension funds and other investors into the energy transition in Ireland.”

By acting as a cornerstone investor, ISIF helps reduce perceived investment risks and signals confidence in the project’s long-term viability.

Infrastructure Investment Critical to Decarbonisation

Energy transition experts widely agree that large-scale infrastructure investment will be required to achieve global climate targets.

Renewable energy technologies such as wind and solar power have expanded rapidly in recent years, but integrating these sources into national energy systems requires significant upgrades to electricity networks, storage systems and supporting infrastructure.

Countries across Europe are therefore seeking to mobilise both public and private capital to finance these projects.

Ireland faces particularly significant investment requirements as it seeks to expand offshore wind generation, electrify transportation systems and modernise its electricity grid.

The development of new climate infrastructure funds like TirNua reflects growing recognition that the transition to a low-carbon economy will require billions of euros in long-term investment.

TirNua Plans Additional Climate Investment Funds

While the current fund represents the first major investment vehicle launched by TirNua Capital Partners, the firm has indicated that it plans to develop additional climate-focused funds in the future.

Chief Executive David O’Brien said the platform represents a new approach to financing Ireland’s energy transition.

“As a first-of-its-kind private markets platform committed to Ireland’s transition to a lower carbon economy, TirNua represents an exciting new way for investors to channel long-term capital into projects that will positively shape Ireland’s future,” O’Brien said.

The platform is currently evaluating a number of potential investments across multiple infrastructure sectors.

Outlook

The launch of TirNua’s climate infrastructure fund highlights the growing role of institutional investment in financing the global energy transition.

While governments have traditionally funded many infrastructure projects directly, the scale of investment required to decarbonise economies has increasingly pushed policymakers to seek partnerships with private investors.

Blended finance models — combining public funds with private capital — are becoming a key mechanism for mobilising the trillions of dollars needed for climate infrastructure worldwide.

Ireland’s strategy of using ISIF as a catalyst investor reflects this broader trend.

By anchoring funds that attract pension funds, asset managers and insurance companies, governments can significantly expand the pool of capital available for renewable energy and clean infrastructure projects.

The TirNua fund also highlights how climate investment is becoming increasingly diversified.

Rather than focusing solely on renewable energy generation, modern climate infrastructure funds invest across multiple sectors including storage, transport electrification, industrial efficiency and digital infrastructure.

As energy systems become more complex and interconnected, such integrated investment approaches will likely become more common.

For Ireland, the success of the TirNua fund could play a crucial role in accelerating progress toward national climate targets while strengthening the country’s position as a hub for renewable energy investment in Europe.

If the fund successfully mobilises additional capital and delivers strong project outcomes, it could serve as a model for similar investment platforms supporting the energy transition across other regions.

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By : Rosemary Wambui

12th March 2026