Case Study: Geothermal Energy Production (Leaving Cert Geography): Revision Notes
Case Study: Geothermal Energy Production in Iceland
Historical context
By the mid-20th century, Iceland was among Europe's poorest nations, heavily dependent on expensive imported coal and local peat for energy. The country faced significant challenges including supply threats during global conflicts, high financial costs of importing fossil fuels, and environmental concerns about air pollution. However, Iceland's unique geological position on the Mid-Atlantic Ridge, with approximately 200 active volcanoes and 600 natural hot springs, provided exceptional opportunities for developing geothermal energy resources.
Iceland's transformation from energy poverty to energy independence demonstrates how geographical advantages can be leveraged to create sustainable economic development when combined with strategic planning and investment.
Understanding geothermal energy
Geothermal energy is produced when power stations pump cold water through pipes deep underground, where volcanic rocks superheat it. The resulting steam returns to the surface and drives turbines connected to generators, creating electricity.
The process works because magma close to Earth's surface heats underground water, which remains liquid due to pressure from overlying rock layers. This naturally heated water can be extracted and used directly for heating homes, businesses and industrial facilities, providing an efficient and sustainable energy source.
Development of Iceland's geothermal industry
Although Icelanders had utilised geothermal heated water for basic purposes since the 1930s, the country's first geothermal power plant wasn't constructed until 1969. The development accelerated dramatically following the 1973 oil crisis, which highlighted the urgent need for energy independence. This crisis motivated Iceland to harness its abundant geothermal resources more extensively.
Today, Iceland leads the world in geothermal energy production, with these renewable sources meeting 65% of the country's total primary energy requirements. The success of this transition demonstrates how nations can effectively reduce their dependence on imported fossil fuels by utilising local renewable resources.
Key energy statistics
- Heating: Geothermal energy provides heating and hot water for approximately 87% of Iceland's buildings, including over 150 public swimming facilities
- Electricity generation: Seven major geothermal power plants produce 30% of Iceland's total electricity supply
- Environmental benefits: Government officials estimate that costs would be five times higher and CO₂ emissions would increase by 40% if Iceland still relied primarily on fossil fuels
Economic advantages of geothermal development
Agricultural applications
Despite Iceland's cool temperatures and short growing season, the country has achieved food self-sufficiency through innovative use of geothermal resources. Heated greenhouses allow year-round cultivation of crops including tomatoes, cucumbers and green peppers. Additionally, geothermal steam helps maintain optimal soil conditions by providing heat for soil treatment and creating extended growing seasons through electric lighting systems.
Practical Application: Geothermal Greenhouse Farming
Step 1: Geothermal water heats greenhouse structures to maintain optimal temperatures Step 2: Extended daylight is provided through electric lighting powered by geothermal electricity Step 3: Soil treatment uses geothermal steam to create ideal growing conditions Result: Year-round crop production in a climate that would normally only support short growing seasons
Aquaculture industry
Geothermal water maintains ideal temperatures for fish farming operations across Iceland. Currently, 20 of the country's 70 fish farms use geothermally heated water to create optimal growing conditions for salmon, trout and Arctic char, supporting a thriving aquaculture sector.
Industrial development
The availability of low-cost, reliable green electricity has attracted significant industrial investment over the past 25 years:
- Aluminium industry: Three major aluminium smelters consume up to 70% of Iceland's geothermal electricity production
- Data centres: The rapidly expanding data centre industry benefits from both abundant electricity and Iceland's naturally cool climate, which reduces cooling costs for servers
Tourism sector
Iceland's most famous tourist attraction, the Blue Lagoon, exemplifies how geothermal development can create additional economic opportunities. This unique spa was formed in 1976 as a result of operations at a nearby geothermal power plant. Visitors now travel from around the world to experience the health benefits of bathing in the mineral-rich geothermal water and applying silica mud treatments.
Did you know? Reykjavik operates the world's largest district heating system using geothermal energy. The system even keeps pavements and car parks snow-free during winter months.
Future developments and challenges
Icelandic officials continue seeking innovative ways to expand their use of geothermal resources:
The Icelink project
Ambitious plans are underway to construct the world's longest underwater electrical cable connection, allowing Iceland to export clean geothermal electricity to the United Kingdom. This "Icelink" project will help the UK achieve its renewable energy targets while providing Iceland with additional economic opportunities.
Hydrogen fuel development
Researchers are developing methods to use geothermal electricity for splitting hydrogen from water molecules. The resulting hydrogen fuel cells could power the country's vehicles and fishing vessels, further reducing dependence on imported fossil fuels.
Growth statistics
Between 1990 and 2014, Iceland's geothermal energy production increased by an remarkable 1,700%, demonstrating the rapid expansion and potential of this renewable energy sector.
Key Points to Remember:
- Iceland transformed from one of Europe's poorest countries to a leader in renewable energy by utilising its unique geological advantages along the Mid-Atlantic Ridge
- Geothermal energy now provides 65% of Iceland's primary energy needs and 30% of its electricity, dramatically improving energy security
- The technology supports diverse economic sectors including agriculture, aquaculture, manufacturing, tourism and data processing
- Iceland's success demonstrates how countries can achieve energy independence whilst boosting economic development through renewable resources
- Future projects like Icelink and hydrogen fuel development show continued innovation in geothermal applications