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renewable energy
energy from sources that are replenished over short time scales or that are perpetually available
Sustainable energy
energy from sources that are renewable and have a low environmental impact
biomass energy
energy that is harnessed when biological material is burned
wind power
energy contained in the motion of air across Earth's surface
solar power
energy harnessed from the Sun in the form of heat or light, and it can be used in two ways: through active or passive technologies
photovoltaic (PV) cells
convert sunlight directly into electrical energy
active solar technologies
convert sunlight directly into electrical energy
passive solar technologies
the capture of solar energy (heat or light) without any electronic or mechanical assistance
payback time
the amount of time it would take to save enough money in operation costs to pay for the equipment
geothermal energy
Energy derived from the heat in the interior of the earth
geothermal power plants
power plants that use the heat of hydrothermal reservoirs to produce steam and turn turbines to generate electricity
geothermal heat pumps
A system that actively moves heat from the underground into a house to warm it or removes heat from a house to cool it
hydropower
Electricity generated from the energy of moving water
smart grid
delivers electricity using two-way digital technology