Unit 8 Case Study: Iceland's Energy Mix and Namibia Environmental Degradation Flashcards
Overview of current production
Utilizes hydroelectric (70%) and geothermal (30%) power for nearly all energy production
Highest per capita energy consumption globally and a world leader in renewables
Renewables have been prioritised since the 1970’s oil crisis to reduce fossil fuel dependency
Largely self sufficient in terms of electricity
Only imports a small amount of fossil fuels for transport and industry
Sustainability targets
40% reduction in CO2 emissions by 2030 relative to 1990
Efforts with Norway and the EU to reduce emissions by 55% by 2030
Achieve carbon neutrality by 2040
Sustainability
Meeting the needs of the present without compromising the ability of future generations to meet their own needs
Current uses
Used for heating, lighting and appliances given the low cost and high availability
Industry consumes 80% of electricity and attracts heavy industries due to low electricity prices and renewable energy availability
Demand for heating increases in winter due to cold temperatures
Demand for energy has grown with the economy for industry but changes in consumption have been minimal
Climatic factors
Colder temperature and shorter days increase energy consumption
There is higher energy consumption for heating and water in cold weather but this has a very small effect on energy demand. These are met by geothermally heated water
The longer days in the summer drive demand for lighting and electrical device consumption but overall consumption is mainly influenced by industry
Heavy industry impact on demand
Aluminum smelting involves the conversion of alumina into aluminum through electrolysis using electricity to separate aluminum and oxygen ions accounting for 66% of total electricity consumption
Mainly carried out at the Fjardaal smelter in West Iceland owned by Alcoa Corporation
Technology impact on demand
Crypto requires consumption to process instructions and data to mine for currency
These generate electricity demand and produce waste heat so need cooling to be efficiency
The Icelandic environment is ideal for this, reducing inputs
Tourism impact on demand
There has been growth of the tourism sector since Eyjafjallajokull eruption in 2010
As tourism recovers from COVID-19 energy demands are rising
Tourism board recognises the need to reduce carbon footprint
Other industries impacts on demand
The achieve energy security there needs to be less dependent on imported oil
There is limited public transport outside of Reykjavik where 80% of the population lives
Transport is the largest consumer of fossil fuels through petrol and diesel combustion
Orka natturunnar as invested in charging points supported by the government for EV’s
In 2021 58% of all cars sold in Iceland were electric and 13% of the rest were partly electric
The ferry connecting Vestmannaeyjar Islands can operate entirely on electricity
Transport will continue to replace oil causing a growing demand for electricity to charge batteries
Industry conflicts with supply and demand
Heavy industry puts the grid under pressure
Limited room to expand hydroelectric and geothermal resources leading to an electricity cap
New industries may find it hard to secure energy
Large dams disrupt ecosystems, river flow and local fish populations
Geothermal plants can cause subsidence, hydrogen sulfide release and other local issues
Energy development has conflicted with preservations due to the value of the natural landscape and biodiversity
Geographical conflicts with supply and demand
Power plants are in remote areas so need transmission networks which are expensive
The grid is small and isolated so it is hard to export any surplus leaving it vulnerable to disruptions
Hydropower supply
Karahnjukar and Burfell power plants
Located in highlands to harness glacial rivers impacting ecosystems and landscapes
Reliable with minimal emissions and provides baseload power that can adjust to demand
Geothermal power supply
Hellisheidi and Nesjavellir plants
Located with geothermal activity in the Southwest regions
Stable with low carbon footprints reducing dependence on electricity for heating
Wind and solar power supply
Limited sunlight so solar is not as feasible
Wind has potential but high winds can be dangerous
Offshore wind farms are being developed to add energy capacity and diversify the mix
Geothermal power mix
On a constructive boundary with a mantle plume hotspot causing increased tectonic activity and potential to harness geothermal heat by drilling into the crust
Geothermal is used in the primary energy mix and provides ⅓ of total electricity
Hellisheidi can produce 300 MW to provide baseload power
Not completely carbon neutral
Fluids and Hellisheidi contain non-condensable gases which are emitted
Hydroelectric power mix
There are 37 large HEP stations and 200 smaller sites
Reliable storage of water in reservoirs and flow control in turbines enables generation as needed
Mainly used in powering aluminum smelting like the Karahnjukar plant in East Iceland
Climate change will accelerate ice melting causing increased river flow
Needs sufficient turbine capacity and storage to minimise wastage of increased flow
Wind power mix
generated from 2 turbines in the North
There are concerns over wind turbines operating in extreme conditions
Installation of wind turbines has a lower and reversible environmental impact compared to HEP dams so is likely to increase in the future
Importance of electricity production
The Russia - Ukraine conflict showed the importance of energy security for availability and affordability
Plans for IceLink, a 1200 MW power cable between Iceland and the UK are underway enabling Iceland to export low carbon renewable energy and supporting the UK’s renewables transition
5800 GWh of electricity per year would need to be produced to make IceLink feasible which is beyond the capacity of existing infrastructure
Increasing capacity carries the risk of conflict with populations, the tourist industry and the natural landscape
There are also concerns about over tourism along the South coast so tourism needs to be more sustainable in the future
Carbfix
Carbon sequestration includes tree planting, wetland restoration, soil conservation and the utilisation of carbon to produce materials such as graphene for smartphones and processors
At the Hellisheidi Power Plant CO2 emissions are captured and dissolved in water resulting in an pacific solution
This is injected into reactive rocks like basalt where it interacts creating calcium, magnesium and iron
Over time these combine with CO2 and mineralise forming stable compounds
Location of Hellisheidi
The plant is 20 km SE of Reykjavik, Iceland’s capital in the SW. This is part of the Hengill volcanic system which is very geothermally active. There are active volcanoes, hot springs and geysers which contribute to the energy. Iceland’s position on the North American and Eurasian plate boundary makes it one of the most geothermally active areas. Since Hellisheidi is near Reykjavik with most of Iceland’s energy demand the plant can efficiently supply electricity and heating to the capital. Geothermal energy allows Icleands 350000 people access to low cost, reliable energy for individuals and industries
The geothermal process of Hellisheidi
The process works by using heat stored in the crust which is transferred through rocks to the surface. Hellisheidi uses a closed loop system. Deep wells of 2500m are drilled into the geothermal reservoir beneath the volcanic area with temperatres of 300C. Water is injected into the ground with a set of wells where it is heated and extracted by other wells as steam. The steam is transported to turbines which spin a generator producing 303 MW (can meet the needs of 100000 homes)
District heating with Hellisheidi
The steam can also be used for district heating, supplying 60% of Reykjavík’s heating requirements. The CHP system increases efficiency by minimising waste and keeping energy costs low while providing a cleaner alternative to fossil fuels
Hellisheidi demand challenges
Recently Iceland has seen an increase in population, urbanisation and industrial development putting pressure on Reykjavík’s energy infrastructure. Many of these industries are energy intensive such as data centres and aluminum smelting. Companies choose Iceland for its cheap, renewable energy which will increase demand, especially in winter when heating is needed. Iceland is also a popular tourist area which increases energy demand especially in remote areas for service development. This requires careful planning and infrastructure expansion
Hellisheidi supply challenges
Geothermal reservoirs are finite and over extraction of heat and steam could reduce energy availability. If not managed, reservoir pressure can drop, reducing the amount of steam and therefore energy that can be produced. To improve and ensure long term sustainability the pressure and temperature of wells are monitored, cooled water is reinjected into the reservoir and the rate at which steam is extracted is regulated. Geothermal plants are relatively low maintenance but the involved high temperatures and pressure can cause break down of equipment. Scheduled maintenance shutdowns are planned to minimise supply disruptions