Upload
nguyenlien
View
218
Download
3
Embed Size (px)
Citation preview
Geothermal Energy - The Icelandic Experience and its Potential for Other
Countries
The Eighth Conference of Parliamentariansof the Arctic Region, Fairbanks, Alaska, August 11-
14, 2008Gudni A. Jóhannesson Prof. PhD. Director General
Orkustofnun, the National Energy Authority of Iceland
World map showing the lithospheric plate boundaries (red dots = active volcanoes)
It is all about geology
Geothermal map of Iceland. ( Basemap: Geological map of Iceland by Haukur Jóhannesson and Kristján
Sæmundsson 1999. Iceland. 1:1.000.000. Icelandic Institute of Natural History
Fuel shares in world electricity generationelectricity generation2004 (International Energy Agency).
The global potential for electricity generation
• The heat flow from the Earth's interior is ca 42 million megawatts of power.
• The interior of the Earth is expected to remain extremely hot for billions of year to comebillions of year to come
• The known sources of geothermal energy are believed for Europe to be able to replace 1 -2 % of the primary energy use and for the world as a whole about 30%.
• The Icelandic example however shows us that exploitation of the fields often leads to further findings.
• Electricity generation could in the year 2020 reach 40 GWe and the total potential predicted by various sources ranges between 140 and 6000 GWe
Installed capacity for geothermal electricity production in 2007 in different countries (Bertani, 2007)
Geothermal exploration• Multidisciplinary approach • Geological mapping• Geochemistry • Geochemistry • Geophysics• The exploratory work
leads to a conceptual model of the geothermal field.
Geological mapping• Tectonic
structure, • Stratigraphy • Stratigraphy • Hydrothermal
alteration• Eruption history
Geochemistry
• Reservoir temperature
• Fluid properties• Fluid properties
Photo: Oddur Sigurðsson
Geophysics• Detect subsurface high
temperature fields• Resistivity soundings, mainly based
on TEM and MT measurements • Analysis of natural seismic events• Aeromagnetic and gravity surveys • Detect water-bearing fractures • The exploratory work leads to a
conceptual model of the geothermal field.
Historical review• 1900 - first attempts to pipe hot water houses and
greenhouses from natural hot springs • 1928, the first district heating system in Reykjavik to a
swimming hall and the nearby houses. • 1940 – 50 15 km long pipeline built from a geothermal • 1940 – 50 15 km long pipeline built from a geothermal
field outside Reykjavík. • 1970 40% of all houses geothermally heated. • 1973 the first world oil crisis came and the price of oil
rose significantly. Large programs started to enhance the use of geothermal energy
• Present – 90 % of houses heated with geothermal and 10 % with electricity
Geothermal District Heating Storage Tanks
Space Heating by Source 1970-2006
Geothermal60%
70%
80%
90%
100%
ElectricityFossil fuels
0%
10%
20%
30%
40%
50%
1970
1973
1976
1979
1982
1985
1988
1991
1994
1997
2000
2003
2006
CO2 savings using geothermal water inReykjavik (Iceland)
Gunnlaugsson, 2008).
Electricity generation• The first attempts to produce electricity around 1950• 1970-80 60 MWe Krafla power plant• Repeated volcanic eruptions, technological challenges.
Lost complement to new district heating projects. rapid development in electricity production from high enthalpy development in electricity production from high enthalpy geothermal resources in Iceland.
• Electricity is now produced in six geothermal power plants with total of 485 MWe installed and an annual production of more than 3600 GWh.
• Planned geothermal power plants are expected to bring the total power capacity up to 1 GW
Well in the Hengill area
Photo Ólafur G Flóvenz ISOR
Svartsengi Geothermal Plant
Primary Energy Use 1940-2006
Coal
100
125
150
175
200P
J
GeoPeat
Oil
Coal
20%
40%
60%
80%
100%
Hydro
Geo
Oil
0
25
50
75
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
2005
Year
Hydro0%
20%
1940 1950 1960 1970 1980 1990 2000
Electricity Consumption 1965 - 2010
10
12
14
16
18
General
consumption
Power intensive
industries
0
2
4
6
8
10
1965 1970 1975 1980 1985 1990 1995 2000 2005 2010
TW
h
New technologies• Refined technologies have enhanced the ability to locate
geothermal sources more accurately. • The improved technology and control of drilling has
made it possible to direct and monitor the track of the borehole in a very efficient way. borehole in a very efficient way.
• New research activities aim at drilling deeper and closer to the magmatic intrusions in the crust into supercritical steam at temperatures up to 500OC.
• Development of new turbines based on binary and hydrocarbon cycles are being developed to extract mechanical power from water and steam at lower temperatures.
The Deep Drilling Project
Heat pumps
Economic alternative to electrical heating
Efficiency is greatly improved with increased temperature of the heat source
www.sev.nu/varmepumpar.shtml
Icelandic activities abroad• Icelandic international aid - geothermal energy. • The Geothermal Training Programme (GTP) of The
United Nations University (UNU) Students from China (65), Kenya (41), and the Philippines (31) and eighteen other countries have sent 5-25 participants. other countries have sent 5-25 participants.
• Icelandic specialists from the private and the official sectors are now active as consultants or active players in Ethiopia, Kenya, Tanzania, Nigeria, Russia, South America, Indonesia, China, Greece, Turkey, New Zealand. El Salvador, Nicuaragua, Germany, USA, Hungary, Slovakia and Poland.
Trainees and instructors of The Geothermal Training Programme (GTP) of The United Nations
University (UNU) on surface exploration, Kenya, 2007.
Sustainability• The interior of the Earth is expected to remain extremely hot for
billions of year to come, ensuring an inexhaustible flow of heat. • Harnessing of geothermal power will not significantly affect the heat
balance of the earth and will not affect the possibilities of coming generations to continue harvesting geothermal energy
• Locally however some reservoirs can, in some cases, be emptied of • Locally however some reservoirs can, in some cases, be emptied of heat energy.
• In Iceland the water geothermal fluid is contaminated mostly with a small concentration of CO2 and sulfuric compounds, SH2 H2S .
• The basaltic rock has good ability to bind CO2 in the form of the mineral calcite in the pores of the rock A pilot project to capture and fix CO2 from power plants in the underlying rock is ongoing.
Conclusion• The Icelandic experience shows that generating
electrical power from geothermal is a viable industry that attracts large industrial investors
• The nature of geothermal files systems can vary in geology and chemistry which demands a large input of R&D in the planning and erection of new power plants. R&D in the planning and erection of new power plants.
• The geothermal fields and the power plants have been a stable and reliable provider of electricity over long time and yielded excellent economical results.
• Geothermal power seems to be one of our best bets to make a significant reduction of the CO2 emissions in an economical way.
USA TODAY Tuesday
• The operator of Chena Hot Springs resort is looking at the possiblity of making is looking at the possiblity of making electricity out of oil field water using geothermal technology