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The goal of renewable energy
To reduce the amount of CO2 emissions to net zero.
Net zero CO2 emissions
No excess CO2 is produced compared to the rate of CO2 being removed through processes like photosynthesis.
Intermittent power supply
A type of energy supply that is not consistently available due to factors like location and weather.
Cogeneration
The ability to combine heat and power generation from sources like Biomass, Geothermal, and Solar.
Biomass
Energy derived from organic material, such as wood or biofuels like ethanol.
Hydropower
Energy generated from the movement of water to turn turbines.
Geothermal energy
Energy derived from the heat of the Earth’s core.
Solar energy
Energy harnessed from the sun to generate electricity or heat.
Wind energy
Energy produced by converting the mechanical energy of the wind into electrical energy.
Hydrogen fuel cells
Specialized fuel cells that reduce the need for gasoline in transportation.
Biofuels
Liquid fuels produced from biomass, such as ethanol or biodiesel.
Ethanol
An alcohol produced by fermenting biomass, often seen as a gasoline replacement.
Biodiesel
A fuel made from vegetable oil or animal fat, used as an alternative to diesel fuels.
Cellulosic ethanol
Ethanol produced from cellulose, which is found in all plant material.
Hydropower advantages
Completely renewable, efficient with an EROI over 80:1, and emits no carbon dioxide.
Renewable energy policies
Government initiatives such as tax credits and feed-in tariffs that support the use of renewables.
Photovoltaic Cells
Devices that convert sunlight into electricity by causing electrons to move across silicon plates.
Thermal pollution
Temperature impacts caused by damming rivers, affecting downstream ecosystems.
Wind turbine EROI
Wind turbines produce 20 times more energy than they consume.
Geothermal energy limitations
Geothermal energy can be depleted if wells use heated water faster than it can recharge.
Algae for biofuels
Algae species cultivated for biodiesel, ethanol, or jet fuel production.
