Space-heating accounts for 35% of total energy-related emissions in Ireland today. As one key component of its response to the National Climate Action Plan, South Dublin County Council (SDCC) committed to the decarbonisation of its county-town, Tallaght. Nationally, decarbonisation will rely on increasing renewable generation assets – wind and solar – on the grid to a target of 85% by 2030. This will enable significant carbon-savings through the widespread electrification of the heat and transport sectors.
The Tallaght District-Heating (DH) Scheme was identified as a pilot project to promote this switch to low-carbon, renewable heating. 70% of the Dublin region is suitable for adaptation to DH (increasing to 86% in the city centre). There are sufficient waste heat sources in Dublin to service the equivalent of 1.6 million homes; DH can recycle and harness this waste heat as a low-carbon resource for space-heating.
In 2016, as part of a five-city EU Inter-Reg programme to foster DH technology in northern Europe, €950,000 was made available (including €347,000 from SDCC resources) to underwrite initial work on the Tallaght DH network. This seed-funding allowed the formation of South Dublin District-Heating Company – Ireland’s first not-for-profit, publicly-owned heat utility, now trading as ‘Heat Works’.
The DH network was envisioned, championed, and project managed by the SDCC Architects Department, building on experience installing CHP, solar arrays, heat pumps, and bio-mass boilers in public buildings over a twenty-year period. The DH scheme was a collaboration between SDCC, Amazon, Fortum (the contractor), and the Dublin energy agency Codema, which has provided a low-carbon solution, optimising the potential of recyclable heat combined with innovative heat-pump technology. Heat Works is set up to act as an exemplar heat-network business in Ireland, delivering economic, environmental, and social benefits for residents and businesses while supporting the local and national climate action plans by reducing our carbon footprint.
Heat Source
At this time, Amazon Web Services (AWS) were planning a large data centre in Tallaght. As part of pre-planning discussions with SDCC, AWS agreed to collect and make available waste-heat from the data-centre’s cooling-system to the DH network. As part of this agreement, waste-heat collection equipment and ongoing heat delivery to Heat Works will be at the expense of AWS in line with their company commitment to global carbon-reduction. The Tallaght DH network is the first scheme in Ireland to capture and efficiently re-use waste heat from a large-scale data centre using bespoke 4G district-heating technology. 10MW of waste-heat is available for use in the Tallaght network on this basis.
It is currently estimated that by 2028 data centres may be using up to 29% of the national grid, and by 2030 will have added 13% to carbon-emissions on the grid. While not eliminating all primary energy use, DH can seriously offset the generation of both heat and carbon for space-heating required by DH customers and greatly reduce carbon emissions discharging energy-intensive waste-heat from cooling systems in data centres.
The Energy Centre and Pipe-Network
To utilise the waste-heat generated by AWS, a distinctive zinc-clad Energy Centre was constructed adjoining the data centre to collect, consolidate, and distribute hot-water to the DH network. The hot air from AWS is collected and run through a heat-pump to raise the temperature of water to 25-27°C. This water is then transferred to the Heat Works Energy Centre building where the temperature is raised again through bespoke centralised large-scale heat pumps to 85°C and sent through the pipe network. In turn, the servers in the data centre are provided with cool air as a by-product from the Energy Centre. The Energy Centre also includes full peak load back-up via a 3MW electric boiler to ensure heat supply to the network can be met at all times. The scheme is fully electric with no on-site combustion resulting in the elimination of particle emissions. In addition, the carbon content of the heat will continue to reduce over time in line with the decarbonisation of the national grid through increased deployment of renewable sources, e.g. onshore / offshore windfarms, solar power, etc [1].
This Tallaght DH scheme is currently providing both space-heating to buildings on the DH network and cooling to the data centre [2]. The scheme currently has planning permission for 400m³ of thermal water-storage. In time, this will enable greater flexibility and utilisation of off-peak electricity, which will increasingly enable the DH network to support the grid by providing greater demand-side response services to regulate large fluctuations associated with wind-power generation. The initial pipe network measures 1.6km in length, utilising different sizes of pre-insulated pipes to ensure minimal thermal losses. Hot water is distributed to customer buildings through the pipe network from the Energy Centre. Heat exchanger substations are located within the customer buildings with an indirect system (the network water crosses and heats the customers’ water, but they do not mix). Energy meters measure the amount of thermal energy used by the customer for heating spaces, HVAC systems, and sanitary hot water.
Overall, the Tallaght DH Scheme produces CO₂ savings of 1500 tonnes per annum in the first phase of the scheme along with a reduction of 528kg in nitrogen oxide emissions. This will increase as the scheme expands and the input of renewably-generated electricity increases. In effect, fossil-fuel usage will be reduced by 100% as the grid is made fully renewable. The lack of combustion onsite eliminates particulates and provides cleaner air for Tallaght town centre.
In addition to road testing DH generation and control technologies in Ireland, the Tallaght scheme was set up to trial the legal, financial, procurement, and governance structures required for a heating network in Ireland. A series of innovative contract types had to be developed for the project carried out under the skilful direction and experience of Philip Lee and Associates Solicitors. The fledgling company required an experienced energy-supply company (ESCO) to design, construct, and operate the DH network. This role was tendered across the whole of the EU using the OJEU process. The tender was arranged as a ‘Competitive Dialogue’ in three stages culminating in the submission of a final design and financial bid. This included the design of the Energy Centre and the distribution pipe network. The preferred bidder was Fortum, a multi-national ESCO based in Finland with extensive experience in DH across the Nordic countries and Eastern Europe.
Procurement Models
A Local Energy-Supply Contract (Design, Build, Operate, & Maintain – DBOM) between the ESCO and Heat Works was agreed. This contract is divided in two phases – Construction Phase (Design & Build), and Operation Phase (Operate & Maintain). Heat Works buys the heat produced from the ESCO based on a fixed operational carbon-efficiency figure. The manner in which this heat is produced, and the risks associated with its production is the responsibility and risk of the ESCO, and the cost of electrical supply is at the risk of Heat Works. A separate new contract had to be developed and agreed to address the transfer of waste heat from AWS to Heat Works, and the return of lower-temperature water from the DH network to AWS to assist in cooling within the data centre.
A customer-contract was also required addressing the sale of heat from Heat Works to each customer. Heat Works are responsible for customer relations and calculation of customer bills. Monthly customer bills include fixed components (two standing charges for administration and network maintenance), and a variable charge for quantity of heat supplied. The initial customers are SDCC (County Hall and Library, the Innovation Centre, and two-hundred affordable apartments) and TUD Tallaght (main campus building, SSRH sports building, and the North Block Catering College). To date, 70,000m² of space are connected to the Tallaght network, and total investment stands at €8 million [3].
The contract for Design, Build, Operate, and Maintenance was signed in October 2020 and works commenced in 2021. Works were directly affected by COVID-19 government-imposed site closures. Testing began on the plant and network during October, November, and December 2022. Heat was delivered to first customers from 19 January 2023 with Substantial Completion achieved in July 2023. Since then, the district-heating scheme has been in its Operation and Maintenance phase.
Present Tense is supported by the Arts Council through the Arts Grant Funding Award 2024.
1. In March 2024 for instance, 43% of electricity from the grid was generated from fully renewable resources, with a target of 70% set for 2030.
2. The energy production system consists of primary production units, secondary auxiliary systems, automation and control systems, and electrical power systems based on 3MW of waste heat capacity and 5MW of district heat capacity. The system operates at 320% efficiency, i.e. every kW of electrical supply generates 3.20kW of heat to the network. The Energy Centre and network is controlled remotely from Finland via the SCADA system for optimal efficiency.
3. The project was funded through a blend of EU grant, Irish government grant, SDCC finance, and initial investment by Fortum, including:
• €4.9 million grant funding through the Irish Government’s Climate Action Fund (Dept. of the Environment, Climate and Communications).
• €670,000 via EU Inter-Reg project.
• €770,000 through SDCC as matching funding to Inter-Reg grant and seed funding.
• The remaining project upfront capital was provided by Fortum, to be repaid to them in monthly instalments over the ten-year duration of the DBOM Contract.
• Capital funding for the Energy Centre equipment and network pipework was linked to connection charges payable by heat customers.
There are two ways to look at the collision of one's beliefs having pursued an architectural degree, and starting one's first job in architecture. A collision between one's assumptions and reality may not be the nicest experience, yet it can be truly valuable. Such collision, as long as either of the two doesn't change, is inevitable. Such a collision between an architecture graduate's thoughts, and the reality of working in a practice can have positives and negatives – but such an occasionally uncomfortable thing can be beneficial, and in fact broaden a graduate's skillset.
When the two worlds collide
Architecture is mainly taught through a five-year course. Students optionally, and quite often, take ‘a year out’ between third and fourth year to (most often) work in architectural practice, which is likely to be their first long-term and intense experience with architecture as a career. As long as architecture is taught in the manner it is, the collision between a student's assumptions and beliefs, and their real-world priorities is almost inevitable.
Such a collision creates an opportunity to question their real-world priorities, and might possibly lead to their improvement, or at least understanding of their role in practice. This can make following their principles easy, intentional, and sensible. However, such collision can, in reality, prove an obstacle – when the theory and the practice don't align, the theory can often feel like a waste of time. This should, in turn, be an incentive to challenge the theory or even practice, so that students and graduates would feel more familiar with life after graduation – if familiarity is considered the only ‘right’ way to be prepared.
Collision as a benefit and an opportunity
Collision between one's assumptions, beliefs, and priorities, and with every-day architectural practice is inevitable due to the nature of how architecture is sometimes taught. In college, one goes through years of working on various projects in theory to learn how to think when it comes to creating space. For instance, one is expected to pay attention to how the space feels, how it gets constructed and used, about its environmental impact, and last but not least, what it looks like.
Nonetheless, designing in an architectural studio seems to be rarely led by these criteria, although they are hopefully the ultimate goal. For example, affordability, practicality, and buildability most often seem to be more important than aesthetics, comfort, and innovation.
Aesthetics is invariably resolved by manufacturers producing a tested list of windows and doors, bricks, kitchen cabinets, and roof tiles to choose from, which are generally considered aesthetically pleasing, but most importantly buildable. They are mostly prefabricated and rely on certification, and a builder’s familiarity with them. This in turn ensures that they are the most affordable option, a priority – particularly in housing. An attempt to use bespoke windows, with a particular aesthetic in mind, will prove pointless due to the cost of production, testing, and certification. This naturally leads to a question as to whether one can design and construct a thoughtful building whilst almost entirely using prefabricated products. More pertinently, a graduate may wonder whether one can aspire to design aesthetically pleasing buildings at all – these may begin to feel like the naïve remain of the college experience that fades away with time?
Comfort has been (allegedly) defined by minimum sizes of houses and apartments, along with sizing bedrooms, storage spaces, living spaces, balconies, and terraces through housing guidelines – along with often-used typical details of construction elements such as precast concrete floor slabs, or particularly timber frame panels. In this instance, it feels as if there is no need for another Le Corbusier´s ‘Modulor’ studied in the college environment. Here, one was encouraged to re-think what has been established to understand it, and to aspire to improve upon it. Indeed, the fact that something has long been constructed in a certain manner does not mean it is being built in the right way – so how can one be sure that the prescribed and recommended design is ideal, if one is not encouraged to question it?
Innovative solutions are imprisoned between building regulations and cost requirements that are often non-negotiable. One can either view them as a challenge or as a barrier, and given architecture's role in tackling various societal issues and in making our environment a better place, it feels best to see them as a challenge.
In truth, the collision between a freshly college-influenced mind and the architectural world poses several questions which could lead to an improvement of the real-world rules by which we construct spaces, an improvement rooted in not accepting reality as it is. In other words, I believe perceiving all the limitations as a challenge rather than as a barrier is the best way in which to improve our built environment.
Collision as an incentive
Nonetheless, the collision between architectural theory and architectural practice can also be viewed as a wrinkle that needs to be ironed out of a graduate. Resolving this discrepancy can be performed by changing the means by which architecture is taught, by establishing fewer rules, and by making both theory and practice more intertwined.
Architectural courses should enhance one's creative and problem-solving skills, as well as one´s interest in new solutions and techniques. However, in practice affordability and practicality often prove more important than aesthetics and innovation precisely because they ensure people have a roof over their head, and the safety provided by that essentially offers comfort. It can often feel as if there is no use in pursuing one´s creative skills and innovative thinking, as building regulations and design manuals have already tackled various scenarios. In this reality, architectural courses should perhaps be more reflective of the real work environment, and the philosophy of practice.
This collision could be avoided by changing the way architecture is taught. If theory were more like everyday practice, graduates would be provided with a more realistic view of what a career in architecture will be like. In principle, this would allow a student make a more informed decision as to whether a career in architecture is what they aspire to.
Collision as a way to improve
This collision is a good thing because it creates potential for improvement, and disillusion can encourage one to discover a different way to make use of one's skills. It creates space for questioning, understanding, and possibly improving architectural practice and, in turn, our environment – rather than choosing to resign oneself to an inevitability.
In this article Kristyna Korcakova discusses the preparation education provides architectural graduates, and explores whether this is the most accurate preparation for architecture in practice.
ReadThe idea that politicians will manipulate or misrepresent data to paint a favourable picture, as seen at last November’s election when multiple government ministers claimed 40,000 houses would be built in 2024, knowing full well that was nigh-on impossible, is nothing new. Back in the 1960s, new houses were counted when any grants due were paid, and on becoming the new minister with responsibility for housing, Neil Blaney made sure housing grants were paid under his tenure and not the previous incumbents, so he could claim credit for houses started and finished before he was in office. That’s politics, and often housing, one of the most political of policy areas.
Sixty-odd years later, data is still being misused and abused. In some ways, it is more worrying now as data increasingly informs policy (a good thing), but the data is often not independent, nor rigorous in its production (not so good).
When tackling the issue of housing completions, it is important to note that since the 1970s we now count a new house when it is connected to the electricity grid. The issue here is that housing is most often connected to the electricity grid long before it is finished, and so it could be up to a year before the ‘connected’ house is ready to occupy. Neither does being connected to the electricity grid mean it is legal to occupy – that status is only conferred on receipt of a Certificate of Compliance on Completion (a ‘Completion Cert’).
So, housing completion numbers are nine to twelve months ahead of themselves. 2024’s 30,300 ‘completions’ will come on stream for occupation all through 2025, and maybe even into 2026. Our completions aren’t really complete.
Indeed, we are lucky we are counting houses properly at all. Until 2017, the Department of Housing had been overcounting the number of new houses being completed in the country by up to 58%. New electricity connections had been including every “warehouse, farmhouse, henhouse, outhouse and doghouse” – to misquote Tommy Lee Jones in The Fugitive – as well as actual houses. Defending his overzealous officials, the Minster at the time said: “All I can do is use the same methodology that we’ve always used” [1], which was untrue.
Under his successor, Eoghan Murphy, it was discovered that the officials knew all along the numbers were overestimated when he asked them to calculate more accurate statistics – “Yes, but the right figure will show fewer new houses, Minister.”
There are question marks hanging over a lot of other data too. Are we really short 484,000 new houses in Ireland, or some 22% of the current housing stock, as per a recent report from Hooke and MacDonald, the estate agents whose main business is selling apartments? Why do we count density per hectare in terms of the number of housing units (e.g. eighty per hectare) instead of number of bedspaces, which is a much better metric as it focuses on the number of people being accommodated. The answer, of course, is that more units generate more rental income, and increasing bedspace density would mean having to build larger apartments, thus reducing the income-generation potential of developments.
Will more supply bring down house prices? No, it never has, as supply is only a small part of house price inflation – interest rates and wages are much bigger drivers. Should it really cost €590,000 to build a two-bedroom apartment? Councils do it for an average of €345,000.
Do we really need €20 billion a year of international investment in the Irish housing system, most of which will be used to build apartments solely for rent? This is a typology few want for a plethora of reasons (poor construction and challenging owners management issues, for example), and a tenure about which the Department of Housing’s own research contradictorily found 86% of non-home owners aged 25-49 want to be home-owners? Homeless numbers bizarrely only count those with some form of a roof over their heads, and also exclude 3,500 homeless international protection applicants.
According to the Central Statistics Office, Ireland had 163,433 vacant houses at the last census in 2022. According to GeoDirectory, a commercial database company set up by An Post and Tailte Éireann, there are less than half that number – at just over 82,000 empty houses. That is quite the difference, and yet attempts to understand this difference by looking at GeoDirectory’s methodology (the CSO’s is publicly available) are difficult as they don’t release it. Yet it is the GeoDirectory number that ministers cite when they want to underplay their lack of progress in tackling vacant housing for many years now.
This is all fun and games for housing data nerds, but it is also highly risky. A lot of panic-inducing common narratives are provably untrue (e.g. RPZs don’t work), yet still recited ad nauseum by wilfully or otherwise naive politicians and other commentators, and are sometimes found influencing housing policy. Claims that tens of thousands of housing units were held up by judicial review led to legally dubious sections in the new Planning and Development Act. Claims that it is simply not viable (whatever that means) to build apartments has led to subsidies of up to nearly €250,000 per apartment [2]. Claims that we are short an untold number of apartments will lead to further wooing of international money; and so on. All of this comes at a cost, not always financial.
Policy then becomes policy for those with political access, investors, and other overseas landlords, not policy for decent housing. Ireland’s official housing document, ‘Housing for All’, becomes ‘Housing for the Top One Per Cent’, as like in all good housing crises, the political and lobbyists answer to a housing crisis is yet more luxury housing.
In the absence of a meaningful response from the state, the private sector has the state over a barrel. Housing policy will never succeed when its foundations are wobbly.
In the the context of the recent controversy around housing completion figures, Dr Lorcan Sirr explores the subjectivity of housing statistics, and the impact these figures have on housing policy.
ReadIreland is one of the most expensive places in Europe to build a home. Materials and labor have been outpacing inflation since the 1990s. Irish apartments are now subject to rules so strict that they’re the second most expensive in Europe [1] to construct. On top of these high construction costs, there's another factor weighing on prices: the cost of basic infrastructure – water pipes, roads, community parks – that new residents end up footing. I want to talk about how spreading the costs more fairly could benefit everyone, not just newcomers.
Historically, local authorities used to pay for infrastructure through a combination of national grants, commercial rates, and domestic rates, which had been in place for decades. In 1978, though, the Local Government (Financial Provisions) Act removed domestic rates. That decision effectively ended the system where water and other utilities were funded by the public as a whole. Today, first-time buyers and renters shoulder a heavier share of the bill.
Take water connections as an example. Uisce Éireann manages and maintains Ireland’s water infrastructure and is overseen by the Commission for the Regulation of Utilities. In principle, it receives the bulk of its budget from central government. However, under the Planning and Development Act 2000, new developments also pay a Section 48 levy to local authorities and a separate water connection charge to Uisce Éireann itself. Of the agency's total funding in 2024, about €72 million [2] came directly from new domestic connections. And much of these charges are passed onto first-time buyers and renters.
The most recent iteration of Uisce Éireann charges come from the 'Shared Quotable Rebate' (SQR) system. It was introduced to address the ‘first mover disadvantage’, where a developer faced with the cost of building water infrastructure is deterred by the high upfront cost. The SQR tries to fix that by offering partial rebates to the initial investor if later developers connect to the same infrastructure. Unfortunately, it does so by shouldering the first mover with significant upfront costs.
Increasing the upfront cost of delivering homes decreases housing supply by discouraging investment in housing, a point firmly made by the Report of the Housing Commission. It makes investment in housing riskier than it already is and that is something Ireland cannot afford. The Department of Finance [3] says that to deliver 50,000 homes a year, approximately €16.9 billion would be required from private capital sources. Making that investment riskier by increasing the upfront cost will inevitably result in fewer homes.
Underpinning all of this is a question of fairness: why should people who don’t yet own a home pay more for water or roads than those who have lived in the area for decades? A more promising path is to spread these essential costs across all residents through local property taxes, much as local authorities did before 1978 through domestic rates. Reintroducing that broader tax base doesn’t just solve a moral dilemma; it also supports a more robust approach to financing critical infrastructure.
When the burden of infrastructure is shared, builders can invest more confidently in new homes. That means more projects can move forward, and the houses or apartments that get built are more affordable than they would be under the current system. Lower home prices, in turn, make it easier for first-time buyers to enter the market.
Such a shift also creates a better incentive structure for local authorities and residents. With a broader property tax base, local governments can collect predictable and reliable revenues from both existing and newly built homes. They would have a stronger reason to champion growth in their communities – because every new project would predictably contribute to the overall fiscal health of the community. Rather than relying on upfront fees which slow down development, property tax revenues grow as developments fill up. Revenues can then be reinvested in better roads, public spaces, and social services, further enhancing the area’s appeal and attracting more residents and businesses, creating a win-win for local residents and newcomers.
Sharing the costs of infrastructure across all taxpayers isn’t just about fairness (although it is about that). It is about making the incentives of development align toward shared prosperity. The payoff is a virtuous cycle in which everyone – newcomers and existing residents alike – benefits from a healthier housing market and a better-resourced public realm.
In the midst of the housing crisis, Seán O'Neill McPartlin discusses the increasing inequality in how we fund infrastructure, and the need to share this burden to incentivise new development.
ReadWebsite by Good as Gold.