World Geothermal Congress 2026: Reykjavik, Iceland

Reykjavik Welcomes the World: Geothermal Innovation on Display

The first thing you notice approaching Harpa Concert Hall and Conference Centre on opening day is how the light behaves. The early spring sun rises low over Faxaflói Bay, refracting through Harpa’s crystalline facade in a thousand shifting hexagons of amber, blue and cold northern white. Outside, the air is sharp and metallic on the tongue, the temperature hovering just above freezing, but warmth pulses up from vents and manholes as if the city itself were exhaling. There is, if you pause long enough at the waterfront, a faint mineral tang to the breeze – a hint of sulphur carried from geothermal plants on the plateau above Reykjavik, braided with sea salt and the smell of freshly ground coffee drifting from the foyer café.

Inside Harpa, the atmosphere thrums with the particular electricity of a global summit at the precise moment an idea becomes inevitable. Delegates in dark suits and bright Icelandic wool sweaters queue together at registration desks, name badges flashing the geography of the energy transition – Nairobi, Jakarta, Reykjavik, Houston, Berlin. Snatches of conversation in English, Icelandic, German, Japanese and Swahili overlap: talk of megawatts and drilling depths, of reservoir management and fiscal incentives, of how to turn the murmur of the Earth into the soundtrack of a net-zero future. On a screen above the crowd, a looping video sweeps over geothermal plants tucked into black lava fields, pipes like silver threads disappearing into the fog.

Harpa’s interior feels like an extension of the geology outside – a canyon of glass and steel, its vertiginous atrium echoing with footsteps and the soft chime of warming-up instruments from a rehearsal hall. For this week, orchestra pits and performance spaces have been transformed into plenary rooms and technical session halls. In the main Eldborg auditorium, named for an ancient volcanic crater, red seats curve around a stage where the opening ceremony is about to begin. The smell here is a subtle blend of polished wood, stage dust and wool coats just in from the cold, with that ever-present ghost of geothermal sulphur in the air when someone opens a door to the harbor-side terrace.

As the house lights dim, a hush settles over a room of more than two thousand geoscientists, engineers, financiers, policymakers and students. The Congress chair steps to the podium, framed by a backdrop of Iceland’s high-temperature fields, and welcomes the world to a country where almost every light in the city and almost every hot shower trace their origin to heat rising from the mantle. The theme they introduce is both aspirational and matter-of-fact: geothermal energy as a cornerstone of a sustainable, secure and affordable global energy system, with Iceland as living proof of what is possible when a small nation leans fully into the power beneath its feet.

The Prime Minister follows, speaking not from abstraction but from a nation’s lived experience. They remind the audience that more than nine in ten Icelandic homes are heated with geothermal energy and that nearly all of the country’s electricity comes from renewables. In the 1970s, when oil crises rattled Europe, Iceland accelerated its shift from imported fossil fuels to domestic heat, threading district heating pipes beneath streets and between apartment blocks. Today, geothermal energy provides the lion’s share of the country’s primary energy, warding off winter cold, powering greenhouses, swimming pools and industrial processes, and dramatically cutting emissions.

Further keynote speakers – from the head of Reykjavik Energy to the CEO of a next-generation geothermal startup and an African energy minister balancing development needs with climate commitments – sketch out a global vision. They talk about superhot rock systems that could deliver dense, always-on power; closed-loop technologies capable of turning non-ideal geology into reliable heat sources; and policies to accelerate deployment without sacrificing safety or communities. Their words echo off the acoustic panels like a manifesto. In the pauses between speeches, the audience can hear the faint groan of the building as the harbor wind presses against its glass skin, a reminder that all this ambition is grounded in a real, rugged place where winter storms are common and reliability is not a luxury but a necessity.

When the session breaks, delegates spill into Harpa’s upper foyers, crowding along glass balustrades that hang over the water. Outside, dark basalt rocks glisten with spray, and in the distance steam plumes rise from the highlands where deep wells feed Hellisheiði Geothermal Power Station and other plants. Lanyards swing as people gesture animatedly, cups of strong Icelandic coffee warming their hands. It is here, in these in-between spaces – where the faint smell of geothermal minerals crosses with the scent of cardamom pastries, where laptop screens reflect snow-tipped mountains – that ideas, partnerships and projects begin to crystallize.

By the time twilight folds over Reykjavik, the Congress has already settled into its pulse: panels and plenaries, hallway debates and spontaneous rooftop meetings, the city’s district-heated pavements carrying a throng of delegates back and forth along the waterfront. The world has arrived at Harpa not just to celebrate Iceland’s achievements, but to ask a pressing question: how can the quiet heat that transformed this island nation rewrite the global energy story?

Deep Dive: Next-Gen Geothermal Technologies Unveiled

If the opening ceremony is about aspiration, the technical sessions that follow dive straight into the engineering reality of a geothermal renaissance. In a side hall named for another volcanic landmark, a standing-room-only crowd leans forward as slides flash with reservoir cross-sections, drilling bit schematics and power curves. Conversations here are less about poetic visions and more about rock mechanics, fluid dynamics and supply chains robust enough to drill to depths once considered off-limits.

Enhanced Geothermal Systems – EGS – are at the heart of this excitement. Traditional hydrothermal projects tap naturally permeable, water-filled reservoirs; EGS, by contrast, seek to create or enhance permeability in hot, dry rock, vastly expanding the geologic canvas for geothermal development. On one screen, a researcher from a European lab explains how new modeling tools are capturing the complex dance of fractures underground, correcting overly optimistic predictions of early EGS experiments by better accounting for heat transfer between rock and circulating fluids. On another, a team from the western United States shows 3D visualizations of multi-stage stimulation in granite at depths beyond four kilometers, the fractures glowing like illuminated roots reaching toward superheated zones.

The real buzz, however, centers on closed-loop systems – sealed subsurface radiators that can deliver heat without directly interacting with underground fluids. At the front of one session, an engineer from Eavor walks the audience through the company’s flagship project in Geretsried, a town in southern Germany where the first commercial-scale Eavor-Loop has recently begun delivering power to the grid. Instead of relying on the vagaries of natural fractures, Eavor drills a series of connected horizontal and vertical wells, forming a deep, buried loop. Inside that closed circuit, a working fluid circulates continuously, soaking up thermal energy from the surrounding rock and transporting it to surface heat exchangers.

As the engineer shows photos from the Geretsried site – drilling rigs towering over Bavarian forests dusted with snow, manifolds and control units gleaming under floodlights – the room’s collective imagination lights up. They explain how the system’s isolation from native fluids minimizes induced seismicity and contamination risk, how modular design could allow rapid replication, and how the project’s success is already inspiring follow-on developments in Germany, Canada and beyond. During the Q&A, a policymaker from East Africa asks the obvious question: when, and at what cost, could a similar closed-loop system be deployed in rift valley countries where transmission lines trace the edge of volcanic fields?

Elsewhere in Harpa, attention focuses on the frontier of superhot rock. In a packed panel, geologists and engineers describe the daunting yet tantalizing prospect of drilling into formations where temperatures exceed 400 degrees Celsius – deep enough to produce ultra-dense, high-enthalpy fluids capable of powering turbines with an efficiency that rivals or surpasses conventional fossil plants. Lessons from the bold but challenging Iceland Deep Drilling Project, which encountered magma at depth, have fed into a new generation of designs emphasizing better materials, adaptive well architecture and continuous monitoring. One Icelandic engineer, shrugging into a thick cardigan against the overactive air conditioning, compares it to learning to “park a straw at the edge of a volcano without burning it.”

The key enabling technologies, repeated like a mantra throughout the Congress, are radical advances in drilling. On one stage, a team demonstrates millimeter-wave drilling – a technique adapted from high-power microwave research – that uses directed electromagnetic energy to spall and melt rock rather than grind it. High-speed footage shows a beam boring into basalt at rates that would have seemed impossible with traditional rotary bits, potentially slashing costs and timelines for accessing deeper, hotter reservoirs. Across the hall, another group presents on polycrystalline diamond compact bits optimized for extreme conditions, while a service company showcases downhole tools designed to survive the brutal thermal and chemical environment of superhot wells.

Between sessions, in a corridor lined with exhibition booths, the future of geothermal is laid out in hardware: mock-ups of slim, flexible tubulars; sensor arrays no thicker than a pencil; compact surface plants resembling shipping containers more than conventional power stations. At the Reykjavik Geothermal stand, maps of Africa and Asia are spread across a table, brightly colored overlays indicating promising geothermal basins. A young reservoir engineer from the company explains how lessons learned from high-enthalpy projects in Ethiopia and Tanzania are informing new investment models, where local utilities and communities share early-stage risk with international capital.

In a quiet meeting room overlooking the harbor, we sit down with an Icelandic drilling manager who has spent three decades coaxing heat from hostile rocks. Their hands are broad and calloused, fingers tracing imaginary well paths in the air as they talk. The shift, they say, is as much philosophical as technical: away from seeing geothermal as a niche suited only to exceptional geology, and toward treating it as an engineering challenge that can be solved almost anywhere with the right combination of drilling, reservoir management and surface technology. Closed-loop systems and superhot rock wells are different routes to the same destination – a world where reliable, weather-independent renewable energy can be sited closer to demand, underpinning grids that no longer tremble at the absence of wind or sun.

By the end of the day, the Congress’s technical sessions have made one point abundantly clear. Geothermal is no longer just a story of lucky volcano nations. It is becoming an engineered resource, shaped by advances in physics, materials science and data analytics – and the innovations unveiled in Reykjavik suggest that the most dramatic chapters have yet to be written.

Policy & Investment: Shaping a Sustainable Energy Future

Yet technology alone does not build power plants or lay district heating pipes under city streets. In Harpa’s upper conference rooms, where panoramic windows look out across Reykjavik’s low, brightly colored roofs, the conversation turns to the slow, intricate work of policy, regulation and finance. Here, the language shifts from degrees Celsius and megawatts to risk premiums, permitting timelines and sovereign guarantees.

In one panel, Icelandic officials outline a new policy initiative designed to ensure the country retains its competitive edge in geothermal expertise. Although Iceland already runs on almost 100 percent renewable electricity and relies overwhelmingly on geothermal for heat, the government is not resting on its laurels. Instead, it is updating licensing frameworks to encourage more efficient use of existing fields, promoting cascading uses that squeeze every last joule from hot water before it returns to the ground, and investing in research to make medium- and low-temperature resources viable for both power and direct use. The goal, as one official puts it to applause, is to move from being a geothermal success story to being a perpetual geothermal laboratory for the world.

Across the table sit investors from sovereign wealth funds, development banks and climate-focused private equity firms. They are drawn to geothermal’s promise of stable, long-term returns – heat and baseload electricity that do not depend on the weather – but they are blunt about the obstacles. Upfront exploration costs are high, timelines stretch into the better part of a decade, and many countries lack the regulatory clarity or institutional stability to make large capital commitments feel safe. That, they argue, is where smart policy can be transformational: de-risking early stages through public funding and guarantees, streamlining permitting, and ensuring that grid access and tariffs recognize the particular value of always-on renewable power.

One session focuses on lessons from recent gatherings that have quietly shaped the geothermal agenda between headline conferences. At a table discussion referencing the Geothermal Energy Forum held in Gran Canaria, participants recall how island economies – from the Canaries to the Azores to the Caribbean – are rethinking their dependence on imported fuel. There, conversations about tourism and economic resilience intertwined with talk of drilling campaigns and district heating loops, revealing geothermal as not just an energy solution but a strategic asset for communities acutely vulnerable to both climate change and volatile fuel prices.

In another workshop, delegates from Washington, D.C. describe the mood at Geothermal Capitol Hill Day, where scientists and industry leaders fanned out through congressional offices to make the case for deeper federal support. The result, they note, can already be seen in bipartisan bills aimed at accelerating geothermal deployment and funding research into superhot rock systems. Measures to modernize permitting, expand exploration in previously studied regions and strengthen cost-recovery mechanisms are slowly weaving geothermal into the broader fabric of U.S. energy policy. For an industry long overshadowed by solar and wind in public discourse, these legislative steps feel like a belated but welcome recognition.

During a coffee break, we speak with a climate-focused infrastructure investor who splits their time between New York and Reykjavik. They are candid about the calculus. Geothermal, they say, sits at the sweet spot between impact and stability: emissions are minimal, land footprints relatively small, and once a field is proven, projects can deliver predictable output for decades. The challenge is that the riskiest money – the capital needed for exploration drilling and early appraisal – often comes at the wrong end of the cost curve. Blended finance models, in which public agencies shoulder some of that initial risk, are therefore essential to unlocking the wave of private funds looking for green, long-duration assets.

Policymakers from countries with rich but underused geothermal resources – Kenya, Indonesia, Turkey – share both frustrations and hopes. They describe exploration programs stalled by budget constraints, promising prospects left untouched because lenders balk at the lack of data, and communities that view drilling rigs with a mix of curiosity and skepticism. At the same time, they speak of nascent reforms: tariff structures that better reward firm renewable capacity, national development plans that couple geothermal build-out with industrial parks and green hydrogen initiatives, and partnerships with institutions that bring not just capital but technical support.

As sunlight fades and the harbor outside turns silver-gray, the day’s policy sessions converge on a surprisingly simple conclusion. For geothermal to move from the margins to the mainstream, it must be understood – and treated – as critical infrastructure. That means long-term planning horizons, consistent regulatory regimes and a willingness by governments to invest in the unglamorous early phases that make later private investment feasible. It also demands that geothermal’s non-electric benefits – the decarbonization of heat, the stabilization of grids, the resilience it provides in storms and cold snaps – are properly valued in planning models and market design.

Walking out into the chill evening air, the delegates pass over sidewalks gently warmed from below by hot water circulating beneath the concrete. The policy debates they have just left may be complex, edged with acronyms and clauses, but the outcome they seek is tangible at their feet: cities and communities made quietly, reliably livable by heat that will be there tomorrow and in fifty years’ time.

Iceland's Geothermal Success Story: A Model for the World

To understand why Iceland exerts such magnetic pull on the geothermal world, you have to leave Harpa for a day and follow the hot water back to its source. Before dawn, a coach full of Congress delegates pulls away from the waterfront, climbing out of Reykjavik past neighborhoods of corrugated metal houses painted in cheerful reds, blues and yellows. Snow lingers in the creases of dark lava fields, and steam curls from roadside vents like breath from a sleeping giant.

As the bus crests the plateau, the landscape opens into a high, windswept plain streaked with snow and lichen. Ahead, domed wellheads and clusters of silver pipes rise from the rock, leading the eye toward the low, geometric silhouette of Hellisheiði Geothermal Power Station. Here, the smell of sulphur is stronger, an eggy sharpness caught in the throat, but the air is also clean and cold, tasting of snow and stone. Turbines inside the plant convert pressurized steam into electricity, while vast insulated pipelines carry hot water down to Reykjavik, feeding a district heating system that serves almost every home, school and swimming pool in the capital area.

A guide from Reykjavik Energy greets the group in a hard hat and neon vest, leading them through a warren of humming machinery. In a control room filled with monitors, engineers track temperatures, pressures and flows in real time, adjusting valves to balance demand in the city below with the health of the reservoirs above. The numbers are impressive – hundreds of megawatts of thermal output, a web of distribution pipelines reaching deep into urban neighborhoods – but what captivates visitors is the ordinariness of it all. This is not a futuristic experiment; it is a piece of civic infrastructure as routine as a water main, quietly defining daily life.

In Reykjavik, geothermal energy is everywhere and nowhere at once. Hot water gushes from kitchen taps year-round, faintly mineral on the tongue. In winter, the heat that radiates from apartment radiators is the same that keeps sidewalks along key streets free of ice, snowmelt steaming faintly in the orange glow of streetlights. Public pools like Laugardalslaug are community living rooms where families soak in outdoor hot tubs even as snow falls around them, steam rising in clouds that smell subtly of the deep earth. More than ninety percent of Icelandic homes are heated this way, and geothermal provides well over half of the country’s total primary energy – a statistic that becomes visceral when you realize that the comfort of your hotel room, the warmth of the café where you sip coffee, even the humidity of the greenhouse-grown tomatoes in your lunch, all trace back to wells punched into volcanic rock.

The economic and climate implications are profound. By shifting from imported oil to domestic geothermal heat over the latter half of the twentieth century, Iceland saved billions in fuel costs while slashing carbon emissions from space heating. Energy security here is not an abstract policy goal; it is a lived reality in which geopolitical crises do not translate into cold radiators. At the same time, geothermal has underpinned new industries, from energy-intensive data centers cooled by the chilly air and powered by steady renewable electricity to food production in greenhouses that glow softly at the edges of town during the dark months.

For all its scale, however, Iceland’s geothermal story is also intimate, woven into small rituals and local lore. South of Þingvellir National Park, along the popular Golden Circle route, lies one such intersection of tradition, landscape and technology: Laugarvatn Fontana. Here, on the shores of a serene lake fringed with black sand and reeds, a low, modern spa complex perches atop bubbling hot springs. Steam drifts across wooden walkways, carrying with it that familiar sulphurous tang, softened by the scent of spruce from the surrounding hills.

Visitors wrap themselves in thick robes and pad out into the cold, their bare feet meeting planks warmed from below by geothermal water. Pools of varying temperatures spill over smooth stones, some so hot they prickle the skin, others gently warm, inviting hours of slow conversation under the open sky. Below one deck, geothermal mud boils and bubbles at the shoreline, sending shimmering waves of heat across the shallows. Staff members move with a kind of practiced ease between the elemental and the everyday, checking temperatures, offering guests cool water, and, at designated times, inviting them to witness a ritual that captures the essence of this place.

On a patch of dark sand a short walk from the spa, a guide in a wool sweater kneels and begins to dig. The ground is warm to the touch, each shovel of sand releasing a puff of steam and a deeper, darker scent of earth. After a minute, they uncover a buried pot, its metal lid beaded with condensation. Inside is rúgbrauð, the dense, slightly sweet rye bread that has been baking for hours in the natural oven of the hot ground. The loaf emerges moist and fragrant, smelling of molasses and malt and the faintest hint of sulphur. Sliced thick and served with cold Icelandic butter and smoked trout by the edge of the steaming shore, it tastes like a bridge between past and present: a method once used by farmers and villagers now shared with delegates in lanyards and fleece jackets, who will soon return to Harpa to debate superhot wells and drilling algorithms.

It is this seamless integration of geothermal into daily life – from the bread on a breakfast table to the warmth beneath school floors – that has turned Iceland into a model studied by cities from Reno to Nairobi. Delegations come to walk the snow-free streets of Reykjavik in midwinter, to sit in boardrooms at Reykjavik Energy and trace maps of district heating networks, to soak in spas like Laugarvatn Fontana and feel for themselves how invisible infrastructure shapes comfort and community. They leave with a simple but radical insight: that heat, often treated as an afterthought in energy planning, can be the foundation of a low-carbon society when harnessed thoughtfully and locally.

Back at Harpa, as case studies from Iceland are dissected in packed rooms, one message surfaces repeatedly. The country’s success was not preordained by its geology alone. It required decades of public investment, experimentation and, crucially, a willingness to see geothermal not only as a power source but as a public good. Pipes were laid not just where it was cheapest, but where they would do the most to improve quality of life. Tariffs were designed to keep heating affordable, and utilities were mandated to plan far into the future, treating the subsurface as a shared resource rather than a short-term opportunity.

The Road Ahead: Challenges and Opportunities for Geothermal Energy

As the Congress moves into its final days, conversations in Harpa acquire a sharper, more reflective edge. No one here is under the illusion that geothermal is a silver bullet. In quieter sessions and late-night discussions over bowls of geothermal-heated tomato soup, participants grapple with the complexities of scaling a resource that is as site-specific as it is promising.

Environmental considerations sit near the top of the agenda. Even in a country as conscientious as Iceland, geothermal development has reshaped landscapes, altered groundwater flows and, in some cases, provoked concern from nearby communities. Elsewhere in the world, careless management has led to subsidence, contamination and conflicts over land use. In response, researchers present new approaches to reservoir modeling that prioritize long-term stability over short-term yield, reinjection strategies that maintain pressure and temperature more evenly, and monitoring systems that can detect and mitigate induced seismicity before it becomes problematic. The emerging consensus is that truly sustainable geothermal must be managed more like a forest than a mine: a resource carefully stewarded across generations.

At the same time, the potential rewards of getting it right are immense. Presentations explore how high-temperature geothermal heat could decarbonize not just electricity and building warmth, but also sectors long considered hard to clean up. In industrial clusters, geothermal could replace fossil boilers in processes from food processing to minerals refining. Paired with electrolyzers, it could provide the steady, low-cost energy needed to produce green hydrogen, feeding into cleaner fertilizers, fuels and chemicals. Experimental projects hint at using superhot geothermal fluids to drive high-efficiency turbines connected to grids dense with variable renewables, offering a firm backbone against which solar and wind can ebb and flow.

Even aviation and heavy transport, often painted as climate laggards, enter the conversation. While planes and long-haul ships will not run directly on steam, the fuels they burn could be produced with geothermal-powered hydrogen and captured CO₂, creating synthetic hydrocarbons that close the carbon loop. In panel discussions, airline sustainability officers sit beside geothermal developers, sketching pathways in which clusters of geothermal plants supply both electricity and process heat to e-fuel refineries sited in volcanic regions from Iceland to Chile and Japan. It is an audacious vision, but one grounded in the same logic that underpins Reykjavik’s snow-free sidewalks: use the heat where it is, in as many ways as possible.

Still, challenges loom. Geothermal’s up-front costs and geological risks mean that without supportive policy and patient capital, many promising projects will never move beyond PowerPoint slides. There is also the issue of perception; in many countries, geothermal is still seen as exotic or untested, overshadowed by the faster, more visible growth of wind turbines and solar farms. Several sessions at the Congress are devoted to changing that narrative, emphasizing geothermal’s complementarity with other renewables and its unique reliability in a warming, more volatile world.

On the Congress’s final evening, as a soft snow begins to fall over Reykjavik, delegates gather one last time in Harpa’s glowing atrium. Through the glass walls, the city’s lights shimmer on wet pavements warmed from below. Inside, the air buzzes with farewells and tentative plans: site visits to rift valleys and volcanic plateaus, cross-border research collaborations, new funds dedicated to drilling the first risky wells. The scent of geothermal minerals is almost imperceptible here, masked by perfume, wool and coffee, but everyone present knows it is there, woven into the very fabric of the building and the city beyond.

As people drift out into the cold night, coats pulled tight against the wind, a thought lingers. Beneath their feet, not just in Iceland but under nearly every country on Earth, the planet’s heat waits – vast, steady, indifferent to politics or weather. The World Geothermal Congress 2026 has not solved the challenge of tapping it at scale, but it has done something equally vital: it has made the invisible feel inevitable. The path to a sustainable future, these days in Reykjavik suggest, may not lie in chasing the sun or the wind alone, but in finally, fully learning to listen to the quiet power rising from below.