Geothermal energy is a renewable energy source because heat is continuously produced inside the earth. People use geothermal heat for bathing, to heat buildings, and to generate electricity.
A Geyser is an example of Geothermal energy. Hot springs, lava, and fumaroles are natural examples of geothermal energy. Geothermal power is currently more common in homes and businesses, using geothermal heat pumps to control the temperature in the building.
Geothermal energy is the heat that comes from the sub-surface of the earth. It is contained in the rocks and fluids beneath the earth's crust and can be found as far down to the earth's hot molten rock, magma.
Installing a geothermal heating system can cost in the region of e11,000 to e13,000, so it is not a decision to be taken lightly. The government-backed “Greener Homes Scheme”, operated by Sustainable Energy Ireland, offered a very attractive grants package for the installation of geothermal systems.
Geothermal heating and cooling is estimated to contribute to of 3.3% to the percentage renewable energy contribution to gross final energy consumption in 2017 and 1.2% of total energy renewable energy contribution to thermal energy combined with air source heat pumps (figure 4).
Unlike other renewable energy sources, geothermal systems are “baseload.” This means they can work in the summer or winter, and are not dependent on changing factors such as the presence of wind or sun. Geothermal power plants produce electricity or heat 24 hours a day, 7 days a week.
On average, a homeowner can expect total expenses to reach between $18,000 to $30,000 on geothermal heating and cooling cost. This cost would cover a complete geothermal installation. The price can range from $30,000 to $45,000 with high-end ground-source heat pump systems for large homes.
Most of the geothermal power plants in the United States are in western states and Hawaii, where geothermal energy resources are close to the earth's surface. California generates the most electricity from geothermal energy.
Geothermal power plants use steam to produce electricity. The steam comes from reservoirs of hot water found a few miles or more below the earth's surface. The steam rotates a turbine that activates a generator, which produces electricity.
How deep do you have to dig? For a horizontal loop you only need to dig between 6 - 8 feet deep. For a vertical loop you need to drill between 250 and 300 feet deep.
Geothermal energy is used to create heating for homes and buildings – such as in Iceland – or is used by geothermal power plants to create electricity at large-scale plants.” We're sure that property owners in the UK are typically looking for a ground source heat pump, rather than geothermal systems.
Various Cons of Geothermal Energy
- Suitable to Particular Region.
- Geothermal Power Has High Initial Costs.
- Cost of Powering the Pump.
- Geothermal Power May Cause Surface Instability.
- Environmental Concerns.
- High Temperatures Needed.
- May Run Out of Steam.
- Sustainability Issues.
An Overview of Geothermal Pros and Cons:
| Pros | Cons |
|---|
| A reliable source as its easier to predict the power output from a geothermal plant with a high degree of accuracy. | Energy fluid needs to be pumped back into the underground reservoirs faster than it is depleted. Management is required to maintain sustainability. |
The geothermal heat pump, also known as the ground source heat pump, is a highly efficient renewable energy technology that is gaining wide acceptance for both residential and commercial buildings. Geothermal heat pumps are used for space heating and cooling, as well as water heating.
What is the cost of installing a ground source heat pump in Britain? Answer: A 6-8 kW horizontal ground source heat pump system usually costs around £10,000 to £12,500 to install. A larger 12kW horizontal ground source heat pump system would cost around £15,500 to £17,500 to install.
There are many advantages of geothermal energy. Unlike solar and wind energy, geothermal energy is always available, 365 days a year. It's also relatively inexpensive; savings from direct use can be as much as 80 percent over fossil fuels.
High capital costs are usually main stumbling block for new geothermal power projects. Geothermal drilling is also one of the main reasons why world doesn't use more geothermal energy.
There is currently no electricity being generated from geothermal sources in Canada although substantial potential exists in the Canadian Cordillera. The most advanced project exists as a test geothermal-electrical site at the Mount Meager massif in British Columbia, where a 100 MW facility could be developed.
With a geothermal heat pump you'll enjoy these benefits:
For every unit of electricity the system uses, it provides three to four units of heating energy - an efficiency of 300% to 400%. Additionally, geothermal systems require only one-third the space of traditional HVAC systems.Geothermal energy is used to heat entire towns in the winter, and more than 81% of the country's energy use comes from cheap, clean energy from domestic sources. Unfortunately exporting the energy itself has proved more difficulty – geothermal energy can't be shipped as easily as oil.
According to the Canadian Geothermal Energy Association, there is a geothermal resource potential of 388,500 megawatts (MW) in Alberta that can be used under existing technical, structural and ecologic restrictions (with a 14% recovery rate.)
At the point of writing, Canada does not currently produce any electricity from geothermal, primarily due to potentially higher upfront costs, competition from existing investments in other types of power generation and a lack of regulatory and policy support.
Primary oil (crude oil and Natural Gas Liquids) accounted for 44% of total production, natural gas 29%, primary electricity (consisting of nuclear, wind, solar and natural flow hydro) 16%, bioenergy and waste 11%, while coal accounted for the remaining 1%.
The ground source heat pump cost will differ from one project to another. The average ground source heat pump prices and installation costs are around £13,000–£35,000. The price would naturally vary depending on the system you select.
Potential for deep geothermal energy in ScotlandThey identified three geothermal energy sources with significant potential: hot dry rocks , which in Scotland are likely to exist in high heat production granites such as those in East Grampian and to the north of Inverness.
Geothermal energy originates from the heat retained within the Earth since the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface.
A ground source heat pump circulates a mixture of water and antifreeze around a loop of pipe, called a ground loop, which is buried in your garden. Heat from the ground is absorbed into the fluid and then passes through a heat exchanger into the heat pump.
In 1855-1857 Peter von Rittinger developed and built the first heat pump system. Some years later Robert C. Webber is credited as having developed the first ground source heat pump during the late 1940s.
How Efficient are Ground Source Heat Pumps? Efficiency is stated as the SCoP and a typical figure for a ground source heat pump would be something over 4.0. This means that for each 1kW of electricity used to drive the heat pump, it will produce 4.0kW of heat.
The major types of renewable energy sources are:
- Biomass. Wood and wood waste. Municipal solid waste. Landfill gas and biogas. Ethanol. Biodiesel.
- Hydropower.
- Geothermal.
- Wind.
- Solar.
