But perhaps most importantly, electricity can be generated from geothermal resources. Electricity-generating power plants convert hydrothermal fluids to electricity, depending on the state of the fluid and its temperature, in three ways — dry steam, flash steam, or binary cycle.
Dry steam systems extract steam out of fractures in the ground, harvesting hot water and steam that can drive turbines on electricity generators.
Flash plants work by pulling high-pressure hot water from deep in the earth into cooler, low-pressure water, resulting in steam that drives the turbines. Binary cycle geothermal power generation introduces a secondary binary fluid that flashes to vapor when it is exposed to heat from the geothermal fluid.
Binary power plants could become more common as unlike the other two methods, they can make use of resources that are below degrees F C , which are the most common geothermal resources throughout the world. The state will use geothermal energy along with many other renewable energy resources. It requires adult assistance:. Does it always have to be sunny to get solar energy? Could it be partly cloudy?
What are some statistics about solar energy? Please cite sources. How does solar energy compare with other renewable energy forms? Impact of this question views around the world. You can reuse this answer Creative Commons License.
These are all sources of geothermal energy. Their heat can be captured and used directly for heat, or their steam can be used to generate electricity.
Geothermal energy can be used to heat structures such as buildings, parking lots, and sidewalks. It remains in the mantle, emanating outward at a slow pace and collecting as pockets of high heat. This dry geothermal heat can be accessed by drilling, and enhanced with injected water to create steam. Many countries have developed methods of tapping into geothermal energy.
Different types of geothermal energy are available in different parts of the world. In Iceland, abundant sources of hot, easily accessible underground water make it possible for most people to rely on geothermal sources as a safe, dependable, and inexpensive source of energy. Other countries, such as the U. Harvesting Geothermal Energy: Heating and Cooling Low-Temperature Geothermal Energy Almost anywhere in the world, geothermal heat can be accessed and used immediately as a source of heat.
This heat energy is called low-temperature geothermal energy. Most pockets of low-temperature geothermal energy are found just a few meters below ground. Low-temperature geothermal energy can be used for heating greenhouses, homes, fisheries, and industrial processes. Low-temperature energy is most efficient when used for heating, although it can sometimes be used to generate electricity. People have long used this type of geothermal energy for engineering , comfort, healing, and cooking.
Archaeological evidence shows that 10, years ago, groups of Native Americans gathered around naturally occurring hot springs to recuperate or take refuge from conflict. In the third century BCE, scholars and leaders warmed themselves in a hot spring fed by a stone pool near Lishan, a mountain in central China.
One of the most famous hot spring spas is in the appropriately named town of Bath, England. The hot springs of Chaudes Aigues, France, have provided a source of income and energy for the town since the s.
Tourists flock to the town for its elite spas. The low-temperature geothermal energy also supplies heat to homes and businesses. The United States opened its first geothermal district heating system in in Boise, Idaho. This system still provides heat to about homes. Co-Produced Geothermal Energy Co-produced geothermal energy technology relies on other energy sources.
This form of geothermal energy uses water that has been heated as a byproduct in oil and gas wells. In the United States, about 25 billion barrels of hot water are produced every year as a byproduct.
In the past, this hot water was simply discarded. Recently, it has been recognized as a potential source of even more energy: Its steam can be used to generate electricity to be used immediately or sold to the grid. One of the first co-produced geothermal energy projects was initiated at the Rocky Mountain Oilfield Testing Center in the U.
Newer technology has allowed co-produced geothermal energy facilities to be portable. Although still in experimental stages, mobile power plants hold tremendous potential for isolated or impoverished communities. GHPs are drilled about 3 to 90 meters 10 to feet deep, much shallower than most oil and natural gas wells. GHPs do not require fracturing bedrock to reach their energy source.
A pipe connected to a GHP is arranged in a continuous loop—called a "slinky loop"—that circles underground and above ground, usually throughout a building. The loop can also be contained entirely underground, to heat a parking lot or landscaped area. During the cold season, the liquid absorbs underground geothermal heat. It carries the heat upward through the building and gives off warmth through a duct system. These heated pipes can also run through hot water tanks and offset water-heating costs.
During the summer, the GHP system works the opposite way: The liquid in the pipes is warmed from the heat in the building or parking lot, and carries the heat to be cooled underground. The U. Environmental Protection Agency has called geothermal heating the most energy-efficient and environmentally safe heating and cooling system. Harvesting Geothermal Energy: Electricity In order to obtain enough energy to generate electricity, geothermal power plants rely on heat that exists a few kilometers below the surface of the Earth.
In some areas, the heat can naturally exist underground as pockets steam or hot water. Dry-Steam Power Plants Dry-steam power plants take advantage of natural underground sources of steam.
The steam is piped directly to a power plant, where it is used to fuel turbines and generate electricity. Dry steam is the oldest type of power plant to generate electricity using geothermal energy. The first dry-steam power plant was constructed in Larderello, Italy, in Today, the dry-steam power plants at Larderello continue to supply electricity to more than a million residents of the area. Since Yellowstone is a protected area, The Geysers is the only place where a dry-steam power plant is in use.
It is one of the largest geothermal energy complexes in the world, and provides about a fifth of all renewable energy in California. As the pressure lessens, a good portion of the water is converted into steam, which then powers a turbine and loses its heat The now-cooled water is returned underground after passing through a condenser, and injected back underground in order to continue the power cycle. The reserves naturally replenish over time and are virtually inexhaustible, even considering the growing need for energy.
Extremely high potential- Current estimates for the maximum production of geothermal power run around 2 terrawatts.
Small footprint- Large portions of geothermal plants can be built underground, limiting their effect on the environment above ground. Readily accessible- While not able to be exploited profitably in all areas, geothermal energy is theoretically exploitable pretty much anywhere on the surface of the planet. Advancing technology- One of the most exciting things about geothermal technology is that the only thing holding it back from being pretty much everywhere is the technology.
If costs come down enough we could have an absolutely golden opportunity at our fingertips. The cons of geothermal energy There are some definite downsides to geothermal plants as well.
Pollution issues- While nowhere near the emissions of coal plants, depending on the area that can be some nasty stuff emitted from geothermal plants. Sulfur dioxide and silica are two of the main culprits, but heavy metals are sometimes contained in the steam released due to their presence in underground reservoirs.
High upfront costs -Geothermal power plants cost a lot to put in. Surface instability- Probably the worst issue with the construction of geothermal plants is that their construction can create earthquakes.
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