Green power sources produce electricity with an environmental profile superior to conventional power technologies and produce no anthropogenic (human-caused) greenhouse gas emissions.
What is the difference between Renewable Energy and Green Power?
Green power is a subset of renewable energy and represents those renewable energy resources and technologies that provide the highest environmental benefit. EPA defines green power as electricity produced from solar, wind, geothermal, biogas, biomass and low-impact small hydroelectric sources. Customers often buy green power to avoid environmental impacts and for its greenhouse gas reduction benefits.
What are the different types of Green Energy?
The most commonly known Green Energy types are Wind Energy, Solar Energy, Hydro Energy, Geothermal Energy, Gasification and Steam Compression Treatment
Wind is a natural form of green energy. The sun heats the earth’s surface. The heat along with earth’s rotation creates winds. The wind flow patterns are determined by the earth's landscape. Humans harness the wind flow to generate electricity through the blades. The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity. In order to generate more electricity, step-up gears are used to increase the number of rotations. To maximize efficiency, a variable pitch is used to increase the amount of wind energy that has been captured. Wind energy has little effect on the environment. It is a natural renewable resource but is not used predominantly because of a large capital expense.
Water is another natural form of green energy. Seventy-one percent of the Earth's surface is covered with water. Through exposure to sunlight, water constantly moves through a vast cycle, evaporating from Earth's surface, forming clouds, precipitating as rain or snow, and flowing back down to the ocean. Because the water cycle is endless, hydropower is considered renewable energy. As flowing water moves downstream, it is directed into a turbine that drives the generator and produces electricity.
The Sun's rays are a natural form of green energy. The Sunrays can be concentrated to produce a large amount of heat. The heat energy is then used to generate electricity in a steam generator. Sunlight can also be converted into electricity using semiconductor solar batteries. Solar energy is underused. One minute of sunlight on Earth is enough to provide humans with energy for one year.
Underground steam is another natural form of green energy. The steam can be accessed by drilling steam wells in a process similar to oil drilling. The heat energy is used to turn steam turbines which drives the steam generator to produce electricity. Considering the size of the USA, Geothermal energy is an enormous underused heat and power resource.