2. contents
• Types of sources
• Solar power
• Hydro power
• Wind power
• Biomass
• Solar-hydrogen
• Geothermal
• sustainable energy
• conclusion
3. Renewable Energy Resources!
• Biomass
• Hydroelectric power
• Geothermal
• Solar—passive and active
• Wind generation
• Hydrogen power
4. Using Solar Energy to Provide Heat
and Electricity
Passive solar heating
Active solar heating
5. Using Solar Energy to Provide High-
Temperature Heat and Electricity
Solar Cell Trade-Offs
Solar thermal systems
Photovoltaic (PV) cells
6. Producing Electricity from
Moving Water
Large-scale hydropower
Small-scale hydropower
50% of West Coast electricity
7% of US electricity
20% of World’s electricity
Major environmental impacts
High construction costs
7. Impacts of hydropower on salmon
and other riverine spp.
Pollution
Disruption of
water flow
Loss of
biodiversity
Invasive species
8. Impacts of hydropower on
Species and People_______________
Dams can provide many human benefits but:
• Disrupts ecological services rivers provide;
e.g. 119 dams on Columbia River have
caused a 94% drop in wild salmon; removing
hydroelectric dams will restore native
spawning grounds
• Displaces millions of people worldwide as
reservoirs flood traditional homelands
• No room for expansion in the US
14. Creating a Sustainable Energy Future
• Increase fuel efficiency standards for
vehicle, appliances, buildings
• Tax and other financial incentives for
energy efficiency
• Subsidize renewable energy use,
research and development
• Internalize externalities for fossil fuels
• By 2050:
– Increase renewable energy to 50%
– cut coal use by 50%
– phase out nuclear altogether
What is nuclear energy? In a nuclear fission reaction, neutrons split the nuclei of atoms such as uranium-235 and plutonium-239. In the process, energy (primarily in the form of high temperature heat) is released. In a nuclear reactor, the production of heat generated by this reaction is controlled and used to produce high pressure steam, which is in turn used to spin turbines that generate electricity. Nuclear fission is basically the splitting of nuclei of certain isotopes with large mass numbers. Neutrons are fired at them, which causes them to split into lighter nuclei and to release single neutrons and energy. These single neutrons can in turn cause additional fission, but there has be enough single neutrons (critical mass) in order for the reaction to sustain itself. If controllable, nuclear power can be an efficient source of power, but large government subsidies distort the true price of nuclear and the disposal of nuclear waste has proven to be an environmentalists nightmare. Disasters on the global scale, such as Chernobyl and Three Mile Island, also highlight the risk of this type of energy source.
What is nuclear energy? In a nuclear fission reaction, neutrons split the nuclei of atoms such as uranium-235 and plutonium-239. In the process, energy (primarily in the form of high temperature heat) is released. In a nuclear reactor, the production of heat generated by this reaction is controlled and used to produce high pressure steam, which is in turn used to spin turbines that generate electricity. Nuclear fission is basically the splitting of nuclei of certain isotopes with large mass numbers. Neutrons are fired at them, which causes them to split into lighter nuclei and to release single neutrons and energy. These single neutrons can in turn cause additional fission, but there has be enough single neutrons (critical mass) in order for the reaction to sustain itself. If controllable, nuclear power can be an efficient source of power, but large government subsidies distort the true price of nuclear and the disposal of nuclear waste has proven to be an environmentalists nightmare. Disasters on the global scale, such as Chernobyl and Three Mile Island, also highlight the risk of this type of energy source.