1. RENEWABLE ENERGY
Renewable Energy Resource - An essentially inexhaustible energy resource on a human time scale.

2. PASSIVE SOLAR HEATING
Passive solar heating – captures sunlight directly without mechanical devices and converts it to low-temperature heat for space heating.
Advantages Disadvantages expensive for initial costs aesthetically not pleasing
1. reduce fossil fuel use
2. less pollution
3. less environmental damage

4. ACTIVE SOLAR HEATING
Active solar heating – specially designed collectors absorb solar energy and use pumps to distribute energy to parts of a building for space and water heating.   
Advantages Disadvantages
1. expensive for initial costs
2. aesthetically not pleasing
1. reduces fossil fuel use 3. energy storage issues
2. less pollution
3. less environmental damage

5. ACTIVE SOLAR HEATING

6. SOLAR THERMAL PLANT

7. PHOTOVOLTAIC CELLS AND SOLAR ENERGY
-Sunlight is composed of photons, particles that contain various amounts of energy corresponding to wavelengths.
-Photovoltaic cells are treated with certain metals that absorb photons
-The electrons present in the solar panel absorb the sunlight energy and become highly excited moving through different materials.
–The moving electrons generate an electromotive force that results into electricity.

8. Photovoltaic Solar Energy

9. HYDROPOWER
1.     Hydroelectric power plants – Form of energy that relies on rushing water to spin a turbine that generates electricity. A dam is built across a large river to create a reservoir. Water is stored in a reservoir during low electricity production. Water is released and flows are controlled as electricity demands peak.
 Advantages Disadvantages
1. Moderate to high energy yield 1. create floods
2. low operating/maintenance costs 2. destroys habitats
low air pollution uproots people where built
4. Most efficient energy source 4. disrupts migratory fish patterns
5.   Generates 19% of worlds energy 5. siltation of dams  

10. HYDROPOWER
Hoover Dam

11. TIDAL POWER
1Tidal Power- power created from tidal or wave energy that spin turbines to generate electricity.
Advantages Disadvantages
1. No pollution few suitable sites
2. Minimal environmental impact Construction costs high
  corrosion
4. appearance

12. TIDAL POWER

13. BIOMASS
Biomass – organic matter in plants produced through photosynthesis and can be burned directly as a solid fuel or converted into a methane gas or ethanol liquid fuel.
1.     Burning wood
2.     Agricultural Waste
a.     Bagasse (sugar cane residue)
b.    Straw
3.     Urban Waste (WTE)
a. burning garbage
4.     Biofuels
a.     Biogas – a mixture of 60% methane and 40% carbon dioxide.
b.    Liquid ethanol- (grain alcohol) which can burned in conventional gasoline engines

14. BIOMASS
BAGASSE
WOOD
GARBAGE
SUGAR CANE
BIOGAS

15. BIOMASS Advantages Disadvantages
1. potentially renewable resource 1. removal of trees depletes
2. less air pollutants released 2. soil erosion and depletion
3. decrease in use of fossil fuels 3. flooding
4. moderate-high net energy yield 4. loss of wildlife habitats
5. No net increase in CO2 if trees
are planted at same rate as biomass
is combusted large land areas needed
6. heavy pesticide/fertilizer use reduces biodiversity decrease of agricultural food

16. GEOTHERMAL
Geothermal Energy - Heat contained in underground rocks and fluid (from geysers, volcanoes, hot springs)that can be tapped for energy.
Extract dry steam, wet steam or hot water and can be used spin a turbine to heat space or water and/or to generate electricity
“Potentially renewable resource”
22 countries currently use geothermal, it supplies 1% of world energy. In the USA (44% geothermal energy produced worldwide) geothermal electricity is produced mostly in Hawaii, California, Nevada, and Utah.

17. GEOTHERMAL Advantages Disadvantages Reliable 1. Scarcity of reservoirs
Renewable Deforestation to
Moderate Net Energy Yield build plants
96% less CO2 emitted 3. Noise pollution odor

18. GEOTHERMAL

19. WIND ENERGY Wind Energy New wind turbines harness wind efficiently
Electric or mechanical energy obtained from surface air currents caused by solar warming of air
World’s fastest growing source of energy
New wind turbines harness wind efficiently

20. WIND POWER ADVANTAGES:
1. most profitable in rural areas with constant wind
2. few environmental problems
3. high net energy yield
Land can be used for other purposes (agricultural)
DISADVANTAGES:
Kills birds
Big cost to install
Energy storage issues
Visual pollution
Noise pollution

21. HYDROGEN FUEL CELLS
Hydrogen fuel cells= using H2 as energy source from H2O electrolysis, then combustion for energy

22. HYDROGEN FUEL CELLS Fuel cell
Device that directly converts chemical energy into electricity
Similar to a battery, only the reactants are supplied from outside source

23. Energy Efficient Technologies
Compact Fluorescent light bulbs
Super-insulated buildings (right)
Energy efficient appliances (ENERGYSTAR)

24. Cogeneration
Production of two useful forms of energy from the same fuel

25. Saving Energy at Home

26. AUTOMOBILE EFFICIENCY
INCREASE FUEL EFFICIENCY ENGINES (40 mpg)
USE OF RECHARGEABLE BATTERY SYSTEM
HYBRID ELECTRIC INTERNAL COMBUSTION ENGINES
*Honda civic
*Ford escape *hybrid
*Toyota prius
*Smart cars

27. ENERGY CONSERVATION WHY????
*MAKE A LIFE STYLE CHANGE ( home efficient and automobile efficient )
*Get government to promote alternative energy , energy conservation, provide tax rebates for using renewable energy
BE GREEN!
To decrease rate fossil fuels are depleted
To decrease dependency in foreign oil resources
To reduce global environmental damage
To provide job for the production of alternative energy