A Half-Year Number That Tells a Decade-Long Story
On 15 September 2026, ESB published its half-year results for the first six months of the year. The headline financial figures were strong — profit after tax of €377 million, up from €313 million in the same period of 2025, operating profit of €520 million against €424 million, and EBITDA of €1,021 million against €907 million. But the number that actually matters for Ireland's energy transition is the one further down the page: capital investment of €1,458 million in six months, an increase of more than €200 million on the first half of 2025 and a rise of over 16%.
That is close to €1.5 billion of infrastructure spending in half a year by a single state-owned company. To put it in proportion, ESB invested €2.7 billion across the whole of 2025 — itself a record — which the company framed at the time as roughly €4 invested in capital projects for every €1 of profit after tax earned. The H1 2026 run rate suggests 2025 was not the peak. It was the base.
Behind it sits a commitment ESB restated with the results: approximately €20 billion of capital investment over the five years to 2030, aligned with the Government's National Development Plan, of which up to €16 billion is earmarked for electricity networks across the island of Ireland.
Where the €1.5 Billion Actually Went
The split matters more than the total. Over €900 million of the H1 2026 spend went into electricity network infrastructure across the island of Ireland — poles, wires, substations, transformers, digital control systems and the unglamorous physical machinery that determines whether a wind farm in Mayo or a housing estate in Meath can actually connect to anything. Almost €500 million went into electricity generation, and around 70% of that generation spend went into new renewable projects across onshore wind, offshore wind and solar.
The network figure includes the first projects delivered under Price Review 6, the regulatory framework that governs what ESB Networks and EirGrid are allowed to spend and recover between 2026 and 2030. The Commission for Regulation of Utilities set a baseline investment allowance of €13.8 billion in its PR6 Final Determination, with the potential to rise to an estimated €18.9 billion through what the regulator calls an Agile Investment and Monitoring Framework — additional spending that can be released during the period if system needs justify it. The estimated bill impact was put at around €12 a year for the average customer, rising to as much as €21 a year under the higher investment scenario.
That is the trade-off stated plainly by the regulator: a modest, visible addition to household bills in exchange for a grid capable of carrying a decarbonised electricity system. Chief Financial Officer Paul Stapleton summarised the company's position with the H1 figures: "We are currently carrying out the biggest ever investment in Ireland's electricity infrastructure."
Why the Grid Became the Bottleneck
For most of the past fifteen years, the Irish renewable energy conversation was about generation — how many turbines, how many megawatts, how many gigawatts by when. That framing has quietly become obsolete. The constraint now is not the willingness to build renewable generation. It is whether the network can accept it, move it and balance it.
The scale of the demand-side pressure is set out clearly in the CRU's Large Energy User connection policy, published on 12 December 2025. Ireland's total electricity demand has grown by 30% over the past ten years, driven largely by data centres, and the regulator concluded that the pace at which new electricity demand is being sought by data centres is faster than the pace of network infrastructure delivery and the development of new generation capacity.
Meanwhile the Central Statistics Office's Electricity Supply by Source release for 2025, published in August 2026, found that half of grid-scale electricity generated in 2025 came from renewable sources. Wind was the largest renewable contributor at 40% of generation, solar farm output rose 51% to 1,101 GWh, and gas remained the single largest source at 47%. Getting to 80% renewable electricity by 2030 is now as much about networks, storage and flexibility as it is about generation.
The Connections Story Nobody Reports
The clearest evidence that the investment is landing is in the connection numbers. ESB Networks and NIE Networks delivered 51,000 new connections in 2025, an increase of more than 15% on 2024, and did so in a year disrupted by Storm Éowyn, which added roughly €100 million to group operating costs and required €95 million in storm remediation and reconnection work.
On the renewable side, ESB Networks connected over 650MW of renewable generation during 2025 and processed more than 47,000 microgeneration installations, adding a further 230MW of solar capacity. In March 2026, Ireland's renewable-enabled network capacity passed the 8GW milestone. There are now around 170,000 microgeneration installations across Ireland, overwhelmingly rooftop solar — a change in the physical shape of the electricity system that has happened largely without fanfare. ESB's Group Head of Sustainability, Sharon McManus, has described it as a "rooftop revolution", and the description is fair: hundreds of thousands of Irish homes are now small generators as well as consumers, and the network has had to be rebuilt around that fact.
Generation: Coal Gone, Offshore Building
On the generation side of the balance sheet, the single most symbolically important event of the period happened in late June 2025, when Moneypoint in County Clare stopped using coal, ending coal-fired electricity generation in Ireland. The station now retains oil only as a back-up capability. ESB's stated plan for the roughly 500-acre site is to convert it into a green energy hub supporting offshore wind construction and operations.
ESB's renewable and renewable-enabling portfolio has grown to over 2GW. The company commissioned its first wholly-owned solar farm at Bullstown in County Meath, and the Neart na Gaoithe offshore wind farm in Scotland — a joint venture with EDF — entered commercial operation. In November 2025, ESB and Ørsted secured rights to develop Tonn Nua, a 900MW offshore wind project off Ireland's south-east coast.
The decarbonisation of ESB's own generation fleet is measurable. Carbon intensity fell to 314g CO2e per kWh in 2025, down 53% against the 2005 baseline. ESB Networks' overarching strategy, Networks for Net Zero, targets a decarbonised electricity system by 2040, built on three pillars: decarbonised electricity, empowered customers and resilient infrastructure.
What It Gives Back to the Country
The 2025 annual results gave the fuller picture of ESB's economic footprint: a €3.4 billion contribution to the Irish economy through payroll, taxes, dividends and purchases from domestic suppliers, with a proposed dividend of €149 million to the State. As Paul Stapleton put it with those results: "Our 2025 financial performance has enabled us to deliver a record capital investment of €2.7bn in critical energy infrastructure, while retaining the financial strength to invest at even greater scale in the years ahead."
How Is It Actually Going?
On the evidence of the first half of 2026, better than the public conversation suggests. The spending is real and accelerating, the connection numbers are rising, coal is finished, offshore development rights are secured and the regulatory framework for 2026 to 2030 is now settled rather than contested. The company is investing at a rate that comfortably exceeds its own profitability, which is precisely what a state-owned utility in the middle of an energy transition should be doing.
The honest caveat is equally clear. At roughly 50% renewable grid-scale generation in 2025, Ireland has thirty percentage points to travel in less than five years, while simultaneously absorbing demand growth that the regulator has said is outpacing infrastructure delivery. The €20 billion is the mechanism designed to close that gap. Whether it closes it fast enough is a question about planning consents, supply chains, skilled labour and delivery discipline as much as about capital.
The Bottom Line
ESB invested €1,458 million in the first half of 2026, up over 16% year on year, with more than €900 million into networks and almost €500 million into generation, 70% of it renewable. Profit after tax rose to €377 million and the company reaffirmed roughly €20 billion of capital investment to 2030, up to €16 billion of it in the network. Coal generation has ended at Moneypoint, 51,000 new connections were delivered in 2025, over 650MW of renewable generation was connected and Ireland's renewable-enabled network capacity has passed 8GW. The grid, not the turbine, is now the decisive piece of Ireland's climate infrastructure — and for the first time it is being funded like it.
Sustainability Pulse covers climate, energy, ESG and environmental policy through an Irish lens. Subscribe to the Sustainability Pulse Briefing — every Wednesday.