What Is Green Power?
Green power is electricity generated from renewable sources like geothermal, solar and wind energy, biomass and hydroelectricity that has a low impact. Read the Full Post is available to consumers in deregulated markets who want to help support green energy sources by putting a small premium to their utility bills.
Many renewable energy sources are less damaging to the environment than drilling for oil or mining coal. They also help reduce our greenhouse gas emission.
Solar Energy
Solar energy is a popular green power source. Solar energy is a renewable resource since it never runs out. It is a safe and efficient energy source which helps reduce air pollution and greenhouse gas emissions from fossil fuels such as oil, coal, and natural gas. This energy is a good alternative for nuclear power which requires the mining extraction, storage and transport of radioactive waste.
The sun's radiation can be utilized to create electricity in a variety ways such as photovoltaic (PV) panels and concentrated solar-thermal power (CSP), and solar thermal collectors. Solar power can be delivered directly to businesses and homes or to grids that distribute electricity to other. Some customers even can sell their surplus energy back to the utility company which could help reduce electricity bills and even offset rising utility prices.
All types of solar energy create no air emissions or pollutants, unlike fossil fuels that create carbon dioxide and other harmful gases during their combustion. Solar energy can be utilized to power satellites, boats, spacecrafts and other devices in areas in areas where accessing the grid is either difficult or impossible.
On a smaller scale solar can also be used to power buildings. Many homeowners install PV cell panels on their roofs to generate electricity and passive solar home design allows these houses to welcome in the sun's rays during the day for warmth and then keep it in the evening. Solar-powered homes also have the advantage of needing minimal maintenance.
Another type of solar power is hydropower, which makes use of the natural flow of water in rivers, streams and dams to generate electricity. Hydropower, like biomass and wind is a renewable resource because it can be replenished. If you are planning to incorporate hydropower into your home or business, check out EPA's list of third-party certified options.
Geothermal Energy
Geothermal plants use the heat of the Earth to produce electricity. The process involves steam and hot water, which naturally occur just a few kilometers beneath the surface of the Earth. It is renewable and a sustainable energy source that generates electricity all day, 365 of the year. Geothermal power can reduce our dependency on fossil fuels. It is also one of the most environmentally friendly methods of energy production.
The most common type of geothermal power plant is a flash steam power station. This makes use of water heated to 182deg C or 360deg F to power turbines and produce electricity. Steam can be used to heat industrial processes or even buildings. Iceland for instance utilizes geothermal energy to melt snow and heat its streets, sidewalks and parking areas in the cold Arctic winter.
Another source of geothermal energy is hot dry rock (HDR) power plant that taps underground reservoirs of hot dry rocks that are heated by man-made or natural activities. HDR plants are simpler to construct and operate as they require less infrastructure. The National Renewable Energy Laboratory estimates that there are enough HDR resources in the United States to meet all of our current energy needs.
The steam from geothermal power stations can be utilized to generate electricity via steam turbine generators or combined with a gas fired turbine to increase efficiency. The mixture is able to be converted into natural gas and then burned in a boiler to produce electricity.
Geothermal energy isn't just safe and reliable, but also has the lowest carbon footprint among all renewable energy sources. Binary-cycle plants that employ an engine to convert steam into electricity create minimal or no nitrous oxide, methane, and sulphur oxide.
Geothermal energy has its own challenges, despite the advantages. The drilling required to construct geothermal power plants could trigger earthquakes and may cause groundwater pollution. Injection of high-pressure water streams into geothermal reservoirs may also cause subsidence. This is a gradual sinking that can damage roads, structures, and pipelines.
Biogas
Biogas is an energy source that is renewable and gaseous that can generate green power. It can be produced from agricultural waste, manure plant material and sewage, municipal waste, food waste, and other organic waste materials. Biogas can be used to transport fuels, electricity heat, combined heat and energy, or electricity using the Fischer-Tropsch method. Biogas is also a viable resource for producing renewable hydrogen to be used in fuel cells which are expected to play an important role in the future of energy systems.
The most common method of valorising biogas is to generate electricity through the power of a combined heat and (CHP) plant. The heat generated by the CHP plant is utilized to fuel the fermentation of organic wastes, while the electricity is then fed back to the grid. Biogas can be further compressed into natural gas and incorporated into existing natural gas distribution systems. Biogas can also be used as a substitute for imported mined natural gas in commercial, ground transportation and residential structures.
In addition to generating renewable energy, biogas can also help reduce carbon dioxide emissions and pollution from conventional cooking. The CCAC is working to develop tools for measuring, reporting and confirming (MRV) of clean cooking in communities and households in low-to-middle income countries in order to assist the 67 countries that have included clean cooking as a goal in their Nationally Determined Contributions (NDCs).
Utilizing biogas to replace fossil fuels for electricity generation as well as a substitute for traditional natural gas for heating and cooling will reduce carbon dioxide emissions and other air pollutions. Biogas is also a viable substitute for oil, coal, and other fossil fuels in the production of liquid fuels for transport.
Capturing and recovering methane from food and animal manure waste stops the release of greenhouse gases into the atmosphere, as well as stopping nitrogen runoff that could otherwise pollute water resources. The Plessis-Gassot non-hazardous waste landfill in Claye-Souilly, France, for instance is a biogas capture facility that transforms it into a sustainable source of energy for the households that are connected to the system. Additionally, small-scale biogas plants can be constructed in cities to facilitate the collection and use of organic waste from local sources, avoiding greenhouse gases that are generated by the transportation and treatment of these materials.
Hydroelectric Power
Hydropower makes use of the energy kinetics of water to generate electricity. It is the most affluent and cost-effective renewable energy source around the globe. It doesn't produce direct greenhouse gases but it does have significant environmental effects. It is a flexible type of green energy that can be adjusted to meet the changing demand and supply. Its service life spans over 100 years, and it can be upgraded to improve efficiency and performance.
Most traditional hydropower plants harness energy of water falling through dams. A series of turbines converts the energy of the water into electricity at a speed that is proportional to its velocity. This electricity is then transmitted to the electric grid for use.
Hydroelectric power plants require a significant investment in reservoirs and pipes. However, operating costs are low. These flexible plants can also be used as backups to other renewable energy technologies that are intermittent such as solar and wind.
Hydroelectric power plants can be classified into two types that are storage and run-of-river. Storage plants are distinguished by huge impoundments that hold more than a season's supply of water, whereas run-of-river facilities are small in size and use water from free-flowing streams or rivers. Hydropower plants are typically located close to or in areas of high population density in areas where demand for electricity is high.
The environmental impact of hydropower is largely dependent on the size and area of the project, as well as the amount of water dispersed, as well as the habitats and wildlife affected by decomposition and flooding. These effects can be minimized and reduced by using Low Impact Hydroelectricity Standards (LIHI) for the construction and operation of hydropower projects. The standards include measures to protect the flow of rivers, water quality as well as protection of fish passage of aquatic ecosystems, watershed protection, endangered and threatened species, recreation and cultural resources.
Certain hydropower plants are the world's biggest "batteries" because they can produce renewable energy by pumping water from a lower pool uphill to a larger reservoir. When there is a demand for electricity then the water in the lower reservoir is released to power generators, while the water in the upper reservoir is pumped back downhill by turbines to generate more electricity.