GEOG 102 discusses energy resources and covers three main topics: energy, conventional energy resources, and alternative energy resources. Under conventional energy resources, it summarizes coal, petroleum, natural gas, hydropower, and nuclear power. Coal formed from decayed plant matter and fueled the industrial revolution. Petroleum is formed from decayed plants and is a highly utilized resource, especially for transportation. Natural gas, hydropower, and nuclear power are also described as major conventional energy sources.

1. GEOG 102 – Population, Resources, and the Environment
Professor: Dr. Jean-Paul Rodrigue
Topic 7 – Energy Resources
A – Energy
B – Conventional Energy Resources
C – Alternative Energy Resources

2. Energy
■ 1. Sources of Energy
• What are the major sources of energy?
• How our usage of energy has changed in time?
■ 2. Energy Use
• To what purposes energy is used for?
■ 3. Challenges
• What major energy challenges are we facing?
A

3. Sources of Energy
■ Nature
• Energy is movement or the possibility of creating movement:
• Exists as potential (stored) and kinetic (used) forms.
• Conversion of potential to kinetic.
• Movement states:
• Ordered (mechanical energy) or disordered (thermal energy).
• Temperature can be perceived as a level of disordered energy.
• Major tendency is to move from order to disorder (entropy).
■ Importance
• Human activities are dependant on the usage of several forms
and sources of energy.
• Energy demands:
• Increased with economic development.
• The world’s power consumption is about 12 trillion watts a year, with 85%
of it from fossil fuels.
1

4. Sources of Energy
1
Chemical
• Fossil fuels (Combustion)
Nuclear
• Uranium (Fission of atoms)
Energy
Non-Renewable
Renewable
Chemical
• Muscular (Oxidization)
Nuclear
• Geothermal (Conversion)
• Fusion (Fusion of hydrogen)
Gravity
• Tidal, hydraulic (Kinetic)
Indirect Solar
• Biomass (Photosynthesis)
• Wind (Pressure differences)
Direct Solar
• Photovoltaic cell (Conversion)

5. Chemical Energy Content of some Fuels (in MJ/kg)
0 20 40 60 80 100 120 140
Hydrogen
Gasoline
Natural Gas
Methane
Methanol
Ethanol
Kerosene
Crude Oil
Coal
Wood
1

6. Sources of Energy
■ Energy transition
• Shift in the sources of energy that satisfy the needs of an
economy / society.
• Linked with economic and technological development.
• Linked with availability and/or remaining energy sources.
• From low efficiency to high efficiency.
• From solids, to liquids and then gazes:
• Wood, Coal.
• Oil.
• Natural gas and hydrogen.
1

7. Evolution of Energy Sources
0% 20% 40% 60% 80% 100%
15th Century
Mid 19th
Century
Early 20th
Century
Late 20th
Century
Mid 21st
Century
Animal
Biomass
Coal
Oil
Natural Gas
Nuclear
Hydrogen
1

8. Global Energy Systems Transition, (% of market)
1
2000
1850 2150
2050 2100
1950
1900
100
80
60
40
20
0
Solids
Liquids
Gases
Wood
Coal
Oil
Natural Gas
Hydrogen

9. World Fossil Fuel Consumption per Source, 1950-
2002 (in million of tons of equivalent oil)
0
1000
2000
3000
4000
5000
6000
7000
8000
1
9
5
0
1
9
5
3
1
9
5
6
1
9
5
9
1
9
6
2
1
9
6
5
1
9
6
8
1
9
7
1
1
9
7
4
1
9
7
7
1
9
8
0
1
9
8
3
1
9
8
6
1
9
8
9
1
9
9
2
1
9
9
5
1
9
9
8
2
0
0
1
Natural Gas
Oil
Coal
1

10. Total World Electricity Generation by Type of Fuel,
2002
40%
19%
16%
16%
7%
2%
Coal
NaturalGas
Nuclear
Hydro
Oil
Other

11. Energy Sources
■ Hubbert’s peak
• Geologist who predicted in the 1950s that oil production in the
United States would peak in the early 1970s:
• US oil production peaked in 1973.
• Assumption of finite resource.
• Production starts at zero.
• Production then rises to a peak which can never be surpassed.
• Peak estimated around 2004-2008:
• One estimate places it symbolically at Thanksgiving 2005.
• Once the peak has been passed, production declines until the
resource is depleted.
1

12. World Annual Oil Production (1900-2004) and
Estimated Resources (1900-2100)
0
5
10
15
20
25
30
1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100
Billions
of
barrels
Actual
Predicted
1

13. Energy Use
■ Energy and work
• Energy provides work.
• Technology enables to use energy
more efficiently and for more
purposes.
• Traditionally, most of the work was
performed by people:
• Many efforts have been done to
alleviate work.
• Creating more work performed by
machines and the usage of even
more energy.
2
Energy
Work
Modification
Appropriation &
Processing
Transfer

14. Energy Use
Modification of the
Environment
Appropriation and
Processing
Transfer
■Making space suitable for
human activities.
■Clearing land for
agriculture.
■Modifying the
hydrography (irrigation).
■Establishing distribution
infrastructures (roads).
■Constructing and
conditioning (temperature
and light) enclosed
structures.
■Extraction of resources
(agricultural products and
raw materials).
■Modifying resources
(manufacturing).
■Disposal of wastes
(Piling, decontaminating
and burning).
■Movements of freight,
people and information.
■Attenuate the spatial
inequities in the location of
resources by overcoming
distance.
■Growing share of
transportation in the total
energy spent
2

15. Challenges
■ Energy Supply
• Providing supply to sustain growth and requirements.
• A modern society depends on a stable and continuous flow of
energy.
■ Energy Demand
• Generate more efficient devices:
• Transportation.
• Industrial processes.
• Appliances.
■ Environment
• Provide environmentally safe sources of energy.
• Going through the energy transition (from solid to gazes).
3

16. Conventional Energy Resources
■ What sources of energy have filled our requirements so
far?
■ 1. Coal
■ 2. Petroleum
■ 3. Natural Gas
■ 4. Hydropower
■ 5. Nuclear Power
B

17. Coal
■ Nature
• Formed from decayed swamp plant matter that cannot
decompose in the low-oxygen underwater environment.
• Coal was the major fuel of the early Industrial Revolution.
• High correlation between the location of coal resources and early
industrial centers:
• The Midlands of Britain.
• Parts of Wales.
• Pennsylvania.
• Silesia (Poland).
• German Ruhr Valley.
• Three grades of coal.
1

18. Coal
■ Anthracite
• Highest grade; over 85% carbon.
• Most efficient to burn.
• Lowest sulfur content; the least
polluting.
• The most exploited and most
rapidly depleted.
■ Bituminous
• Medium grade coal, about 50-75%
carbon content.
• Higher sulfur content and is less
fuel-efficient.
• Most abundant coal in the USA.
■ Lignite
• Lowest grade of coal, with about
40% carbon content.
• Low energy content.
• Most sulfurous and most polluting.
1
0 500 1000 1500 2000
Anthracite
Bituminous
Lignite
Burned energy (1,000 calories per kg)
0 20 40 60 80 100
Carbon content (%)
Energy
Carbon

19. Global Coal Production, 2002 (M short tons)
760
Production
Not significant
1
World Coal Production by Type, 2000
7%
75%
18%
Anthracite
Bituminous
Lignite

20. Coal
■ Coal use
• Thermal coal (about 90% use):
• Used mainly in power stations to produce high pressure steam, which
then drives turbines to generate electricity.
• Also used to fire cement and lime kilns.
• Until the middle of the 20th Century used in steam engines.
• Metallurgical coal:
• Used as a source of carbon, for converting a metal ore to metal.
• Removing the oxygen in the ore by forcing it to combine with the carbon in
the coal to form CO2.
• Coking coal:
• Specific type of metallurgical coal.
• Used for making iron in blast furnaces.
• New redevelopment of the coal industry:
• In view of rising energy prices.
1

21. Coal Consumption, 1950-1998 (in millions of tons)
0
500
1000
1500
2000
2500
3000
3500
4000
1
9
5
0
1
9
5
2
1
9
5
4
1
9
5
6
1
9
5
8
1
9
6
0
1
9
6
2
1
9
6
4
1
9
6
6
1
9
6
8
1
9
7
0
1
9
7
2
1
9
7
4
1
9
7
6
1
9
7
8
1
9
8
0
1
9
8
2
1
9
8
4
1
9
8
6
1
9
8
8
1
9
9
0
1
9
9
2
1
9
9
4
1
9
9
6
1
9
9
8
Restofthe world
India
U.S.
China
1

22. Coal as % of Energy Use and Electricity Generation,
1998
0 10 20 30 40 50 60 70 80 90 100
China
Poland
India
Australia
South Korea
Ukraine
Denmark
Germany
United States
Electricity (%)
Energy (%)
1

23. 2 Petroleum
■ Nature
• Formation of oil deposits:
• Decay under pressure of billions of microscopic plants in sedimentary
rocks.
• “Oil window”; 7,000 to 15,000 feet.
• Created over the last 600 million years.
• Exploration of new sources of petroleum:
• Related to the geologic history of an area.
• Located in sedimentary basins.
• About 90% of all petroleum resources have been discovered.
• Production vs. consumption:
• Geographical differences.
• Contributed to the political problems linked with oil supply.

24. Petroleum
■ Use
• Transportation:
• The share of transportation has increased in the total oil consumption.
• Accounts for more the 55% of the oil used.
• In the US, this share is 70%.
• Limited possibility at substitution.
• Other uses (30%):
• Lubricant.
• Plastics.
• Fertilizers.
• Choice of an energy source:
• Depend on a number of utility factors.
• Favoring the usage of fossil fuels, notably petroleum.
2

25. Petroleum Production and Consumption, 2002 (M
barrels per day)
9,900
Production
Consumption
Not Included
26.2
20.1
42.2
57.7
6.4
5.9
25.2
16.3
0% 20% 40% 60% 80% 100%
1973
2000
Industry
Transport
Non-energy
Other sectors

26. Petroleum
■ Why an oil dependency?
• Favor the usage of petroleum as the main source of energy for
transport activities.
• The utility factors were so convenient that a dependency on
petroleum was created.
■ Taxes
• Should oil be taxed?
• Should the development of alternative sources of energy be
accelerated or enforced?
2

27. Factors of Oil Dependency
Occurrence Localized large deposits (decades)
Transportability Liquid that can be easily transported. Economies of scale
Energy content High mass / energy released ratio
Reliability Continuous supply; geopolitically unstable
Storability Easily stored
Flexibility Many uses (petrochemical industry; plastics)
Safety Relatively safe; some risks (transport)
Environment Little wastes, CO2 emissions
Price Relatively low costs
2

28. Costs of Finding Oil, 1977-2000
0
2
4
6
8
10
12
14
16
18
1
9
7
7
1
9
7
9
1
9
8
1
1
9
8
3
1
9
8
5
1
9
8
7
1
9
8
9
1
9
9
1
1
9
9
3
1
9
9
5
1
9
9
7
1
9
9
9
Costs
of
finding
oil
($
per
barrel)
0
10
20
30
40
50
60
70
Difference
Difference between oil costs and finding costs
Worldwide oil finding costs
2

29. Petroleum
■ Oil reserves
• The world oil production is currently running at capacity:
• Limited opportunities to expand production.
• 20% of the world’s outcome comes from 14 fields.
• Ghawar:
• The world’s largest oil field; been on production since 1951.
• Produces approximately 4.5 million barrels of oil per day.
• 55 to 60% of Saudi Arabia’s production.
• Expected to decline sharply (use of water injection).
• Could be 90% depleted.
• OPEC countries may have overstated its reserves:
• Production quotas are based upon estimated reserves.
• The larger the reserves, the more an OPEC country can export.
• In the 1980s, most OPEC reserves doubled “on paper”.
• Extraction continues while reserves remain the same(?).
2

30. Major Crude Oil Reserves, 2003
0 50 100 150 200 250 300
Saudi Arabia
Iraq
Iran
Kuwait
United Arab Emirates
Russia
Venezuela
Nigeria
Libya
China
United States
Mexico
Algeria
Norway
Angola
Billions of barrels
2

31. Global Oil Reserves, 2003
Barrels (2003)
Less than 5 billion
5 to 25 billions
25 to 50 billions
50 to 150 billions
More than 150 billions
0%
10%
20%
30%
40%
50%
60%
70%
North
America
Central & S.
America
Western
Europe
Eastern
Europe &
FSU
Middle East Africa Asia &
Oceania
Reserves
Production
2

32. Demand for Refined Petroleum Products by Sector in
the United States, 1960-2000 (in Quadrillion BTUs)
0
5
10
15
20
25
30
35
40
1960 1965 1970 1975 1980 1985 1990 1995 2000
Transportation Industrial Residential and commercial Electric utilities
2

33. Petroleum Production, Consumption and Imports,
United States, 1949-2002
0
1
2
3
4
5
6
7
8
1949
1952
1955
1958
1961
1964
1967
1970
1973
1976
1979
1982
1985
1988
1991
1994
1997
2000
Millions
of
barrels
0
10
20
30
40
50
60
Dollars
per
barrel
Production
Consumption
Imports
Real oil price
2

34. Major Oil Flows and Chokepoints, 2003
15
10
3
1
Million barrels
per day
15.3
Hormuz
11.0
Malacca
3.3
Bab el-Mandab
3.8
Suez
Bosphorus
Panama
3.0
0.4
2

35. Petroleum
■ A perfect storm?
• Booming oil prices after 2004.
• Prior oil spikes linked with short lived geopolitical events.
• The situation has changed at the beginning of the 21st century.
• A production issue:
• Petroleum extraction appears to be running at capacity.
• Demand, especially new consumers (China), is going up.
• A distribution issue:
• Limited additional tanker and pipeline capacity.
• A refining issue:
• Limited additional refining capacity.
• No refineries were built in the US since 1974.
2

36. 3 Natural Gas
■ Nature
• Formation:
• Thermogenic: converted organic material into natural gas due to high
pressure.
• Deeper window than oil.
• Biogenic: transformation by microorganisms.
• Composition:
• Composed primarily of methane and other light hydrocarbons.
• Mixture of 50 to 90% by volume of methane, propane and butane.
• “Dry” and “wet” (methane content); “sweet” and “sour” (sulfur content).
• Usually found in association with oil:
• Formation of oil is likely to have natural gas as a by-product.
• Often a layer over the petroleum.

37. Natural Gas
■ Reserves
• Substantial reserves likely to satisfy energy needs for the next
100 years.
• High level of concentration:
• 45% of the world’s reserves are in Russia and Iran.
• Regional concentration of gas resources is more diverse:
• As opposed to oil.
• Only 36% of the reserves are in the Middle East.
3

38. Natural Gas
■ Use
• Mostly used for energy generation.
• Previously, it was often wasted - burned off.
• It is now more frequently conserved and used.
• Considered the cleanest fossil fuel to use.
• The major problem is transporting natural gas, which requires
pipelines.
• Gas turbine technology enables to use natural gas to produce
electricity more cheaply than using coal.
3

39. ■ Liquefied natural gas (LNG)
• Liquid form of natural gas; easier to transport.
• Cryogenic process (-256oF): gas loses 610 times its volume.
• Value chain:
• Extraction
• Liquefaction
• Shipping
• Storage and re-gasification

40. Global Natural Gas Reserves, 2003
Trillion Cubic Feet (2003)
Less than 10 trillion
10 to 50 trillion
50 to 100 trillion
100 to 200 trillion
More than 200 trillion
0%
5%
10%
15%
20%
25%
30%
35%
40%
North
America
Central & S.
America
Western
Europe
Eastern
Europe &
FSU
Middle East Africa Asia &
Oceania
Reserves
Production
3

41. Hydropower
■ Nature
• Generation of electricity using the flow of water as the energy
source.
• Gravity as source.
• Requires a large reservoir of water.
• Considered cleaner, less polluting than fossil fuels.
■ Tidal power
• Take advantage of the variations between high and low tides.
4

42. 4 Hydropower
Sun
Water
Rivers
Reservoirs
Turbine
Electricity
Dam
Evaporation
Precipitation
Accumulation
Flow
Gravity
Sufficient and regular
precipitations
Suitable local site
Power loss due to
distance

43. Hydropower
■ Controversy
• Require the development of vast amounts of infrastructures:
• Dams.
• Reservoirs.
• Power plants and power lines.
• Very expensive and consume financial resources or aid resources that
could be utilized for other things.
• Environmental problems:
• The dams themselves often alter the environment in the areas where they
are located.
• Changing the nature of rivers, creating lakes that fill former valleys and
canyons, etc.
4

44. World Hydroelectric Generating Capacity, 1950-98
(in megawatts)
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
800,000
1
9
5
0
1
9
5
3
1
9
5
6
1
9
5
9
1
9
6
2
1
9
6
5
1
9
6
8
1
9
7
1
1
9
7
4
1
9
7
7
1
9
8
0
1
9
8
3
1
9
8
6
1
9
8
9
1
9
9
2
1
9
9
5
1
9
9
8
Brazil
Canada
United States
World
4

45. Nuclear Power
■ Nature
• Fission of uranium to produce energy.
• The fission of 1 kg (2.2 lb) of uranium-235 releases 18.7 million
kilowatt-hours as heat.
• Heat is used to boil water and activate steam turbines.
• Uranium is fairly abundant.
• Requires massive amounts of water for cooling the reactor.
5

46. 5 Nuclear Power
Uranium Water
Turbine
Electricity
Steam
Fission
Reactor
Production and storage Large quantities
Suitable site (NIMBY)
Waste storage and
disposal

47. Nuclear Power Plants, 1960-2002 (in gigawatts)
0
50
100
150
200
250
300
350
400
1
9
6
0
1
9
6
2
1
9
6
4
1
9
6
6
1
9
6
8
1
9
7
0
1
9
7
2
1
9
7
4
1
9
7
6
1
9
7
8
1
9
8
0
1
9
8
2
1
9
8
4
1
9
8
6
1
9
8
8
1
9
9
0
1
9
9
2
1
9
9
4
1
9
9
6
1
9
9
8
2
0
0
0
2
0
0
2
Capacity
0
5
10
15
20
25
30
35
Construction
Capacity Decommissioned Construction
5

48. Nuclear Power
■ Nuclear power plants
• 430 operating nuclear power plants (civilian) worldwide.
• Very few new plants coming on line:
• Public resistance (NIMBY syndrome).
• High costs.
• Nuclear waste disposal.
• 30 countries generate nuclear electricity:
• About 17% of all electricity generated worldwide.
• United States:
• 109 licensed nuclear power plants; about 20% of the electricity.
• Licenses are usually given for a 40 year period.
• Many US plants will be coming up for license extensions by 2006.
• No new nuclear power plant built since 1979 (Three Mile Island incident).
• China:
• Plans to had 2 new nuclear reactor per year until 2020.
5

49. Global Nuclear Energy Generation, 2003
Billion Kilowatthours (2003)
Less than 25.00
25 to 100
100 to 200
200 to 500
More than 500
5

50. Nuclear Power
■ Nuclear waste disposal
• Problem of nuclear waste disposal; radioactivity.
• Low level wastes:
• Material used to handle the highly radioactive parts of nuclear reactors .
• Water pipes and radiation suits.
• Lose their radioactivity after 10 to 50 years.
• High level wastes:
• Includes uranium, plutonium, and other highly radioactive elements made
during fission.
• Nuclear wastes have a half-life about of 10,000 to 20,000 years.
• Requirements of long-term storage in a geologically stable area.
• Long Term Geological Storage site at Yucca Mountain.
5

51. Nuclear Power
■ Reliance
• Some countries have progressed much further in their use of
nuclear power than the US.
• High reliance:
• France, Sweden, Belgium, and Russia have a high reliance on nuclear
energy.
• France has done this so as not to rely on foreign oil sources.
• It generates 75% of its electricity using nuclear energy.
• The need to import most fossil fuels provides an extra impetus to turn to
nuclear energy.
• Phasing out:
• Nuclear energy perceived as financially unsound and risky.
• No new nuclear power plant built in Europe since Chernobyl (1986).
• The German parliament decided in 2001 to phase out nuclear energy
altogether.
5

52. Nuclear Power as % of Electricity Generation, 1998
0 10 20 30 40 50 60 70 80
France
Belgium
Sweden
Slovakia
South Korea
Hungary
Switzerland
Finland
Japan
Germany
Spain
Britain
Czech Republic
United States
Canada
5

53. Nuclear Power
Pro Nuclear Side Con Nuclear Side
■Reduced fossil fuels dependence
■Enhanced energy security
■Environmental benefits
■Fear of accidents and sabotage
(terrorism)
■Waste disposal
■High construction and
decommission costs
5

54. Alternative Energy Resources
■ What new sources of energy are likely to satisfy future
demands?
■ 1. Context
■ 2. Hydrogen and Fuel Cells
■ 3. Solar Energy
■ 4. Wind Energy
■ 5. Geothermal Energy
■ 6. Biomass Fuels
C

55. Context
■ Emergence
• Received increasing attention since the first oil crisis in 1973:
• Attention varies with fluctuations in the price of oil.
• Several alternate sources need further research before they can
become truly viable alternatives.
• Moving from carbon-based sources to non-carbon based:
• Europe: 22% of its energy to come from renewable sources by 2010.
■ Unsustainability of fossil fuels
• The resource itself is finite.
• Use contributes to the global warming problem.
• Some 35% of the carbon emissions in the USA is attributable to
electric power generation.
• Employing substitutes for fossil fuels in that area alone would
help alleviate our greenhouse gas problem.
1

56. Context
■ Fuel use efficiency
• Not an alternate energy source.
• Can have a great impact on
conservation.
• After 1973, many industries were
motivated to achieve greater
efficiency of energy use.
• Many appliances (including
home air conditioners) were
made more energy efficient.
• The USA continually ranks
behind Europe and Japan in
energy efficiency.
1
CO2 Emissions from Energy
Usage, United States 2001
10%
7%
29%
54%
Residential Commercial
Industrial Transportation

57. Average Gasoline Consumption for New Vehicles,
United States, 1972-2004 (in miles per gallon)
10
12
14
16
18
20
22
24
26
28
30
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
Cars
Light Trucks
Average
1

58. Light-Duty Vehicles Sales in the United States, 1975-
2004 (in 1,000s)
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
1975
1977
1979
1981
1983
1985
1987
1989
1991
1993
1995
1997
1999
2001
2003
Trucks
Cars
1

59. Change in Average Vehicle Characteristics, 1981-
2003 (in %)
0 20 40 60 80 100
Fuel Economy
Weight
Horsepower
Acceleration
1

60. Typical Energy Use for a Car
12%
32%
29%
13%
6%
8%
Momentum
Exhaust
Cylinder cooling
Engine friction
Transmission and axles
Braking
1

61. Context
■ Nuclear fusion
• Currently researched but without much success.
• It offers unlimited potential.
• Not realistically going to be a viable source of energy in the
foreseeable future.
1

62. Hydrogen and Fuel Cells
■ Hydrogen
• Considered to be the cleanest fuel.
• Compose 90% of the matter of the
universe.
• Non polluting (emits only water and
heat).
• Highest level of energy content.
■ Fuel cells
• Convert fuel energy (such as hydrogen)
to electric energy.
• No combustion is involved.
• Composed of an anode and a cathode.
• Fuel is supplied to the anode.
• Oxygen is supplied to the cathode.
• Electrons are stripped from a reaction
at the anode and attracted to form
another reaction at the cathode.
2
Hydrogen
Water Electricity
Fuel Cell
Fuel
Oxygen
Catalytic conversion

63. Hydrogen and Fuel Cells
■ Fuel cell cars
• Most likely replacement for the internal combustion engine.
• Efficiency levels are between 55% and 65%.
• May be introduced by 2004 (working prototypes).
• Mass produced by 2010.
■ Storage issues
• Hydrogen is a highly combustive gas.
• Find a way to safely store it, especially in a vehicle.
■ Delivery issues
• Distribution from producers to consumers.
• Production and storage facilities.
• Structures and methods for transporting hydrogen.
• Fueling stations for hydrogen-powered applications.
2

64. Hydrogen and Fuel Cells
■ Hydrogen production
• Not naturally occurring.
• Producing sufficient quantities to
satisfy the demand.
• Extraction from fossil fuels:
• From natural gas.
• Steam reforming.
• Electrolysis of water:
• Electricity from fossil fuels not a
environmentally sound alternative.
• Electricity from solar or wind energy
is a better alternative.
• Pyrolysis of the biomass:
• Decomposing by heat in an oxygen-
reduced atmosphere.
2
Fossil Fuels
Water
Biomass
Steam
Reforming
Electrolysis
Pyrolysis

65. Solar Energy
■ Definition
• Radiant energy emitted by the sun (photons emitted by nuclear
fusion).
• Conversion of solar energy into electricity.
■ Photovoltaic systems
■ Solar thermal systems
3

66. Solar Energy
3
Sun
Electricity
Solar cells Mirrors
Water
Turbine
Steam
Evaporation
Concentration
Conversion
Level of insolation
(latitude & precipitation)

67. Global Solar Energy Potential
3

68. Solar Energy
■ Photovoltaic systems
• Semiconductors to convert solar radiation into electricity.
• Better suited for limited uses such as pumping water that do not
require large amounts of electricity.
• Costs have declined substantially:
• 5 cents per kilowatt-hour.
• Compared to about 3 cents for coal fired electrical power.
• Economies of scale could then be realized in production of the
necessary equipment.
• Japan generates about 50% of the world’s solar energy.
3

69. World Photovoltaic Annual Shipments and Price
1975-2001
0
50
100
150
200
250
300
350
400
450
1
9
7
5
1
9
7
7
1
9
7
9
1
9
8
1
1
9
8
3
1
9
8
5
1
9
8
7
1
9
8
9
1
9
9
1
1
9
9
3
1
9
9
5
1
9
9
7
1
9
9
9
2
0
0
1
Megawatts
0
10
20
30
40
50
60
70
80
90
Dollars
per
watt
Shipments
Prices
3

70. Photovoltaic Production by Country or Region, 1994-
2001
0
50
100
150
200
250
300
350
400
1994 1995 1996 1997 1998 1999 2000 2001
Rest of World
Europe
Japan
U.S.
3

71. Solar Energy
■ Solar thermal systems
• Employ parabolic reflectors to focus solar radiation onto water
pipes, generating steam that then power turbines.
• Costing about 5-10 cents per Kwh.
• Require ample, direct, bright sunlight.
• Drawback of the solar thermal systems is their dependence on
direct sunshine, unlike the photovoltaic cells.
■ Limitations
• Inability to utilize solar energy effectively.
• There is currently only about a 15% conversion rate of solar
energy into electricity.
• Low concentration of the resource.
• Need a very decentralized infrastructure to capture the resource.
3

72. 4 Wind Power
Air
Turbine
Electricity
Wind mills
Heat
Pressure
differences
Fans
Sun
Wind
Major prevalent wind
systems
Site suitability

73. Wind Power
■ Potential use
• Growing efficiency of wind turbines.
• 75% of the world’s usage is in Western Europe:
• Provided electricity to some 28 million Europeans in 2002.
• Germany, Denmark (18%) and the Netherlands.
• New windfarms are located at sea along the coast:
• The wind blows harder and more steadily.
• Does not consume valuable land.
• No protests against wind parks marring the landscape.
• United States:
• The USA could generate 25% of its energy needs from wind power by
installing wind farms on just 1.5% of the land.
• North Dakota, Kansas, and Texas have enough harnessable wind energy
to meet electricity needs for the whole country.
4

74. Wind Power
• Farms are a good place to implement wind mills:
• A quarter of a acre can earn about $2,000 a year in royalties from wind
electricity generation.
• That same quarter of an acre can only generate $100 worth or corn.
• Farmland could simultaneously be used for agriculture and energy
generation.
• Wind energy could be used to produce hydrogen.
■ Limitations
• Extensive infrastructure and land requirements.
• 1980: 40 cents per kwh.
• 2001: 3-4 cents per kwh.
• Less reliable than other sources of energy.
• Inexhaustible energy source that can supply both electricity and
fuel.
4

75. World Wind Energy Generating Capacity, 1980-2002
(in megawatts)
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
1
9
8
0
1
9
8
2
1
9
8
4
1
9
8
6
1
9
8
8
1
9
9
0
1
9
9
2
1
9
9
4
1
9
9
6
1
9
9
8
2
0
0
0
2
0
0
2
Capacity
Addition
4

76. 5 Geothermal Energy
■ Hydrogeothermal
• 2-4 miles below the earth's surface, rock temperature well above
boiling point.
• Closely associated with tectonic activity.
• Fracturing the rocks, introducing cold water, and recovering the
resulting hot water or steam which could power turbines and
produce electricity.
• Areas where the natural heat of the earth’s interior is much
closer to the surface and can be more readily tapped.

77. Geothermal Energy
■ Geothermal heat pumps
• Promising alternative to
heating/cooling systems.
• Ground below the frost line (about 5
feet) is kept around 55oF year-round.
• During winter:
• The ground is warmer than the
outside.
• Heat can be pumped from the
ground to the house.
• During summer:
• The ground is cooler than the
outside.
• Heat can be pumped from the house
to the ground.
Winter
55o F
Summer
55o F
5 feet
5 feet
House
House
5

78. World Geothermal Power, 1950-2000 (in megawatts)
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1
9
5
0
1
9
5
3
1
9
5
6
1
9
5
9
1
9
6
2
1
9
6
5
1
9
6
8
1
9
7
1
1
9
7
4
1
9
7
7
1
9
8
0
1
9
8
3
1
9
8
6
1
9
8
9
1
9
9
2
1
9
9
5
1
9
9
8
5

79. Biomass
■ Nature
• Biomass energy involves the growing of crops for fuel rather than
for food.
• Crops can be burned directly to release heat or be converted to
useable fuels such methane, ethanol, or hydrogen.
• Has been around for many millennia.
• Not been used as a large-scale energy source:
• 14% of all energy used comes from biomass fuels.
• 65% of all wood harvested is burned as a fuel.
• 2.4 billion people rely on primitive biomass for cooking and heating.
• Important only in developing countries.
• Asia and Africa: 75% of wood fuels use.
• US: 5% comes from biomass sources.
6

80. Energy Consumption, Solid biomass (includes
fuelwood)
0 50,000 100,000 150,000 200,000 250,000
China
India
Nigeria
United States
Indonesia
Brazil
Pakistan
Viet Nam
Ethiopia
Congo, Dem Rep
Thailand
South Africa
Tanzania
Kenya
Thousand metric tons oil equivalent
1990
2001
6

81. Biomass
■ Biofuels
• Fuel derived from organic matter.
• Development of biomass conversion technologies:
• Alcohols and methane the most useful.
• Plant materials like starch or sugar from cane.
• Waste materials like plant stalks composed of cellulose.
■ Potential and drawbacks
• Some 20% of our energy needs could be met by biofuels without
seriously compromising food supplies.
• Competing with other agricultural products for land.
6

82. Biomass
• Could contribute to reducing carbon emissions while providing a
cheap source of renewable energy:
• Burning biofuels does create carbon emissions.
• The burned biomass is that which removed carbon from the atmosphere
through photosynthesis.
• Does not represent a real increase in atmospheric carbon.
• Genetic engineering:
• Create plants that more efficiently capture solar energy.
• Increasing leaf size and altering leaf orientation with regard to the sun.
• Conversion technology research:
• Seeking to enhance the efficiency rate of converting biomass into energy.
• From the 20-25% range up to 35-45% range.
• Would render it more cost-competitive with traditional fuels.
6