Geothermal Direct Use, Securing Heat,Sustainable Systems, Strong Communities In Iceland

Beyond Electricity: Iceland's Masterclass in People-Centered Geothermal Direct Use

By: Robert Buluma 

When most people hear "geothermal energy," they think of power plants, steam turbines, and electricity generation. But Iceland—the undisputed world leader in geothermal utilization—has spent nearly a century proving that the real magic happens when you stop thinking about megawatts and start thinking about people.

While the rest of the world has been fixated on using geothermal resources solely to spin turbines, Iceland has built an entire social and economic fabric around the direct use of geothermal heat. From heating homes and melting street snow to growing tomatoes in the dead of winter and drying fish without fossil fuels, the Icelandic model offers a compelling blueprint for any nation sitting on geothermal potential.

The lesson is simple but profound: electricity is just one product. Heat is the real treasure.

This article explores how Iceland built resilient, community-centered direct-use systems—and what the rest of the world can learn from their example.

Part 1: The Historical Shift – From Coal Anxiety to Energy Independence

To understand Iceland's direct-use revolution, you have to start with coal. For the first half of the 20th century, Iceland was utterly dependent on imported coal. This wasn't just an economic inconvenience; it was a source of national anxiety. Coal shipments were vulnerable to war disruptions, weather delays, and price manipulation by foreign merchants. By the 1930s, working-class families in Reykjavik were struggling to afford proper heating as coal prices climbed, leading to widespread resentment toward coal suppliers.

The turning point came not from an environmental movement—there was none at the time—but from a pragmatic desire for energy independence and social justice. Reykjavik's political Left seized on geothermal heating as a people's cause. They argued that access to affordable heat shouldn't depend on one's ability to pay volatile coal prices. Geothermal promised liberation: no more shoveling coal, no more black dust coating every surface, no more supply anxieties.

What's remarkable about this history is what wasn't part of the conversation. Early geothermal advocates barely mentioned "renewability" or "carbon emissions." Those concepts didn't drive public support. Instead, they talked about comfort, convenience, and equality. Housewives, who bore the burden of stoking coal ovens, were told geothermal would let them simply turn a knob. The poor were told they would finally have reliable heat regardless of their income.

The result? Reykjavik completed its citywide geothermal district heating system between 1943 and 1944, becoming the first city in the world to abandon fossil fuels for heating entirely. By 1970, the average heating cost in Reykjavik was about half of what other Icelanders paid for oil or electricity. That economic dividend created durable political support that has lasted generations.

Part 2: The Numbers That Matter – 90% of Homes, 70% of Primary Energy

Today, the scale of Iceland's direct-use achievement is staggering. Approximately 90% of all homes in Iceland are heated with geothermal energy. When you include other direct applications—swimming pools, snow melting, greenhouses, fish farming, and industrial processes—the total primary energy consumption from geothermal sources reaches about 70% of the country's entire energy mix.

To put that in perspective: most countries celebrate getting 10% of their electricity from renewables. Iceland has effectively eliminated fossil fuels from the heating sector entirely, using a resource that many nations still dismiss as "too risky" or "too localized."

The infrastructure is everywhere. In Reykjavik, hot water drawn from underground reservoirs at temperatures between 100°C and 300°C flows through district heating networks to homes. After it has warmed living spaces, the same water—now cooled to about 30°C—is piped through plastic tubing underneath streets and sidewalks to melt snow and ice. That cascading approach, known as multi-use or cascading systems, extracts maximum value from every unit of geothermal fluid.

This is the core insight of the Icelandic model: geothermal energy is too valuable to waste on a single application. Use the highest temperatures for electricity or industrial drying. Use the medium temperatures for space heating. Use the leftover warmth for greenhouses, fish farming, or swimming pools. Then reinject the cooled water back into the ground to sustain the reservoir. Nothing is wasted.

Part 3: The Community Greenhouse Revolution – Growing Food in the Dark

Perhaps the most inspiring examples of Iceland's direct-use philosophy come from its agricultural sector. With long, dark winters and temperatures that regularly drop below -6°C, Iceland is not an obvious place for farming. Yet the country now produces roughly 50% of its own vegetables—and in some cases, like tomatoes, the figure is even higher.

The secret lies in geothermal greenhouses. The village of Flúðir, population just 400, produces one-third of Iceland's vegetables. The local geothermal power plant, Flúðaorka, has only 600 kilowatts of installed electrical capacity—tiny by international standards. But its primary product isn't electricity; it's hot water. That hot water flows into greenhouses, keeping them warm year-round, allowing tomatoes, cucumbers, and peppers to thrive even when the sun barely rises.

The most famous example is Friðheimar, a family-run restaurant in Reykholt that attracts 300,000 visitors annually. Located in a town where winter temperatures plummet, Friðheimar grows all of its own tomatoes using geothermal heat. The operation requires approximately 2.5 megawatts of power—equivalent to the energy needs of a town of 7,000 people. But because Iceland's renewable energy is cheap and reliable, this greenhouse restaurant is not only viable but thriving.

Further north, the town of Húsavík has been developing a "community greenhouse" concept under the European Union-funded Crowdthermal project. The idea is simple: use excess geothermal heat from the town's district heating system to create a multi-use greenhouse facility where locals can grow food, restaurants can source fresh produce, and schools can teach children about agriculture. The project's leaders emphasize that it's not primarily an "energy project"—the energy is already there, essentially free. It's a social project with economic and educational benefits.

This distinction matters enormously for replicability. When communities realize they don't need to drill expensive wells or build power plants—that the heat is already flowing through pipes under their streets—the barrier to entry drops dramatically.

Part 4: The Blue Lagoon – When Waste Heat Becomes a World-Famous Attraction

No discussion of Icelandic direct use would be complete without the Blue Lagoon. What started as a completely accidental byproduct of geothermal power generation became the country's most visited tourist attraction, drawing hundreds of thousands of visitors annually before the pandemic.

The story: In 1976, the Svartsengi geothermal power plant began operations on the Reykjanes Peninsula. The plant pumped mineral-rich water from deep underground, used its steam to spin turbines, and then faced a problem: what to do with the leftover geothermal fluid? Unlike conventional power plants that discharge waste heat into rivers or the atmosphere, Svartsengi's outflow was a milky blue slurry of silica, algae, and minerals.

Local residents began bathing in the runoff pools, claiming the mineral-rich water helped with skin conditions like psoriasis. By the 1990s, what had been an industrial discharge site had been transformed into a luxury spa and one of Iceland's most recognizable brands. Today, the Blue Lagoon is a masterclass in the circular economy: a geothermal power plant's waste product has become a multi-million dollar tourism and wellness enterprise.

This is cascading use at its most creative. The same geothermal resource that generates electricity for the national grid first produces power, then heats the lagoon, then provides mineral-rich water for skin treatments, and finally—after all that—is reinjected underground. Nothing goes to waste.

Part 5: Small-Scale, Local, Resilient – The Baseload Power Model

One of the most replicable aspects of Iceland's approach is its embrace of small-scale, community-sized geothermal systems. Not every town needs a 300-megawatt power plant. In fact, most don't.

The concept, promoted by companies like Baseload Power Iceland, is "homegrown energy": developing small-scale geothermal heat and power projects that match the actual needs of local communities. The Flúðaorka plant is a perfect example—600 kilowatts of electricity, but crucially, hot water for a town of 400 people. That's enough to power local homes, heat greenhouses, supply the community pool, and still have surplus to sell to the grid.

This model offers several advantages:

Resilience: Small, distributed systems are less vulnerable to grid failures or transmission losses. If one plant goes offline, the rest of the country barely notices.

Speed: Small projects face fewer regulatory hurdles, shorter construction timelines, and lower upfront capital requirements.

Local ownership: When a community owns its energy system, the economic benefits stay local. Jobs, tax revenue, and energy savings circulate within the town rather than flowing to distant corporate headquarters.

Social acceptance: People trust what they understand. A small geothermal plant that heats their school and their swimming pool is visible, tangible, and popular. A distant industrial facility is not.

The contrast with large-scale renewable projects elsewhere is striking. Too often, wind and solar farms are built in rural areas, with most of the electricity shipped to cities, leaving local communities with little benefit and plenty of visual impact. Iceland's direct-use model flips that script: the energy is used where it is produced, creating a natural alignment of interests.

Part 6: The Innovation Hub – What Happens When Energy Is Cheap and Clean

When a country has abundant, cheap, renewable heat and electricity, interesting things start to happen. Iceland's Geothermal Park, operated by ON Power adjacent to the Hellisheiði power plant, has become a clustering point for cutting-edge sustainable industries.

Carbfix turned a scientific observation into a commercial solution: when you dissolve CO₂ in water and inject it into certain basalt rock formations, it mineralizes into solid carbonate within two years. That's not storage—that's elimination. The carbon is locked away for thousands of years. Carbfix now partners with Climeworks, which operates the world's largest direct air capture facility, Mammoth, within the same Geothermal Park. Together, they suck CO₂ out of the atmosphere and turn it into stone.

Kerecis uses fish skin—previously a waste product of Iceland's fishing industry—to create medical products for wound healing. The company's processing facilities run on geothermal energy.

GeoSilica extracts silica from geothermal fluids for use in dietary supplements and skincare products.

Blue Lagoon's parent company has spawned spin-offs like Bláa Lónið skincare, which uses geothermal minerals as active ingredients.

These companies share a common characteristic: they exist because of geothermal direct use, not in spite of it. Cheap, reliable heat transforms the economics of industries ranging from biotech to carbon removal to cosmetics. Iceland's experience suggests that investing in geothermal infrastructure isn't just about energy security—it's about industrial strategy.

Part 7: Social Acceptance – Why Icelanders Don't Protest Geothermal Plants

One of the quietest but most important success factors in Iceland is social acceptance. In many countries, geothermal projects face community opposition—noise concerns, land use disputes, fears of induced seismicity, aesthetic objections. In Iceland, these barriers are remarkably low.

Why? Several factors explain the difference.

Familiarity breeds acceptance. Icelanders have been using geothermal hot water for bathing since the Viking Age. Direct heating for homes began in the early 20th century. When a new geothermal project is proposed, it's not an alien technology—it's a known, trusted extension of existing infrastructure.

Visible benefits. Most Icelanders have direct personal experience with geothermal heating. They turn on their taps and hot water comes out. They walk on snow-free sidewalks in winter. They swim in geothermally heated outdoor pools year-round. These daily, tangible benefits create a reservoir of goodwill that abstract promises about "renewable energy targets" cannot match.

Historical context. The shift away from coal is remembered as liberation, not regulation. Older generations recall the drudgery of stoking coal furnaces and the anxiety of supply disruptions. Geothermal wasn't imposed by environmental activists; it was demanded by ordinary citizens who wanted better lives.

Shared prosperity. The economic benefits of geothermal development are broadly distributed, not captured by a small elite. Cheap heating lowers the cost of living for everyone. Local jobs are created in construction, operations, and maintenance. Municipalities receive tax revenue and energy security.

For countries trying to build public support for geothermal projects, the Icelandic lesson is clear: focus less on climate change and more on quality of life. Tell people about lower heating bills, cleaner air, reliable supply, and local jobs. The climate benefits will follow, but they are rarely the primary motivator.

Part 8: Challenges and Realistic Caveats

A responsible blueprint must acknowledge that not everything about Iceland's model transfers seamlessly. Several caveats are worth noting.

Geology is destiny. Iceland sits atop the Mid-Atlantic Ridge with a mantle plume underneath. It has exceptional geothermal resources that most countries cannot match. High-temperature fields are widespread, and low-temperature resources are nearly ubiquitous. Replicating Iceland's success requires realistic expectations about local geology.

Upfront costs remain real. Even in Iceland, geothermal development requires significant capital investment. Drilling is expensive, and exploration carries risk. The difference is that Iceland's government created risk-mitigation mechanisms early—notably the Icelandic Energy Fund, which provided drilling guarantees—and sustained them over decades. Other countries could adopt similar policies, but they require political will.

Maintenance is not trivial. Direct-use systems, especially those utilizing high-temperature fluids, face scaling, corrosion, and maintenance challenges. The town of Hveragerði, for example, has experienced operational issues related to mineral deposition and varying ownership structures. A thermohydraulic modeling study of Hveragerði's district heating system found that the network was stretched to capacity and required new booster pump stations and pressure zoning to function optimally. Direct use is not passive infrastructure; it requires ongoing management.

Not everyone connects. Even in Iceland, some communities remain unconnected to geothermal district heating. Remote rural areas and some towns are still heated with oil or electricity. The government continues exploration drilling to expand coverage, but progress is incremental.

Part 9: Lessons for the World

Despite these caveats, Iceland's direct-use model offers transferable lessons for any country with geothermal potential—from the volcanic arcs of Southeast Asia to the Rift Valley of East Africa to the western United States.

Lesson One: Start with heat, not electricity. Electricity is valuable, but it's also wasteful. A geothermal power plant converts only a fraction of the resource's energy into electricity; the rest is discharged as waste heat. Direct use captures far more of that energy. For most communities, the priority should be district heating, greenhouses, aquaculture, and industrial drying—applications that use lower temperatures and deliver immediate economic returns.

Lesson Two: Design for cascading use. Don't ask "what can we do with this geothermal resource?" Ask "what sequence of uses can extract maximum value?" High-temperature fluids should generate electricity first, then heat buildings, then warm greenhouses, then heat swimming pools, then melt snow. Each step uses lower temperatures, but collectively they maximize utilization.

Lesson Three: Decouple heat from power. In Iceland, district heating systems operate largely independently of electricity generation. Hot water is produced, distributed, and used—without ever spinning a turbine. This is cheaper, simpler, and more efficient. The fixation on electricity generation has blinded many countries to the value of direct use.

Lesson Four: Build at community scale. Small, local projects are faster, cheaper, and more popular than giant centralized plants. A 1-megawatt district heating system serving a few thousand homes is a realistic entry point for most communities. It builds experience, creates local champions, and demonstrates value before scaling up.

Lesson Five: Use policy to de-risk drilling. The single biggest barrier to geothermal development is exploration risk—the possibility of drilling a dry well. Governments can address this through risk insurance programs, partial guarantees, or public-sector exploration drilling. Iceland's Energy Fund, established decades ago, proved that this works.

Lesson Six: Communicate benefits, not just metrics. The most successful Icelandic advocates didn't talk about megawatts or emissions reductions. They talked about warm homes, liberated housewives, and affordable heat for the poor. These human-centered messages built durable political support that technical arguments could never achieve.

Conclusion: A Blueprint, Not a Copy

No country can literally replicate Iceland. The geology is unique, the history is specific, and the cultural context is particular. But the principles of the Icelandic model are widely transferable: prioritize direct use over electricity generation, design cascading systems that extract maximum value, build at community scale, use policy to manage drilling risk, and ground the entire enterprise in the promise of better lives.

The global energy transition has been fixated on electricity for too long. Heating accounts for roughly half of global energy consumption, yet it receives a fraction of the attention and investment. Iceland's century-long experiment proves that a different path is possible—one that uses the heat beneath our feet to warm homes, grow food, power industry, and build resilient, prosperous communities.

The blueprint exists. The question is whether the rest of the world is ready to read it.

See also: Clean Energy Alliance Signs Exclusive Letters of Intent with GreenFire Energy, Ignis H2 Energy, and TLS Geothermics to Advance Geothermal Commitment

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Source:  Green By Iceland's