Geothermal Energy

Geothermal Energy is heat (thermal) derived from the earth (geo). It is the thermal energy contained in the rock and fluid (that fills the fractures and pores within the rock) in the earth's crust.

In most areas, this heat reaches the surface in a very diffuse state. However, due to a variety of geological processes, some areas, are underlain by relatively shallow geothermal resources.

These resources can be classified as low temperature (less than 90C or 194F), moderate temperature (90C - 150C or 194 - 302F), and high temperature (greater than 150C or 302F). The uses to which these resources are applied are also influenced by temperature. The highest temperature resources are generally used only for electric power generation.

Uses for low and moderate temperature resources can be divided into two categories: direct use and ground-source heat pumps.

Direct use, as the name implies, involves using the heat in the water directly (without a heat pump or power plant) for such things as heating of buildings, industrial processes, greenhouses, aquaculture and resorts. Direct use projects generally use resource temperatures between 38C (100F) to 149C (300F). .

Ground-source heat pumps use the earth or groundwater as a heat source in winter and a heat sink in summer. Using resource temperatures of 4C (40F) to 38C (100F), the heat pump, a device which moves heat from one place to another, transfers heat from the soil to the house in winter and from the house to the soil in summer.

The key to wider geothermal use is greater public awareness and technical support.

Latest Geothermal Energy news

Arnie Announces Ground Breaking Plan To Tackle Climate Change
California Governor Arnold Schwarzenegger closed the just-concluded climate change summit he co-hosted in the US by announcing the formation of what he described as a first-of-its-kind, innovative, sub-national public-private alliance committed to crafting climate change solutions and building the global green...
UK councils now permitted to sell green electricity
A ban on councils in the UK selling green electricity into the national grid is to be overturned, UK Climate Change Secretary Chris Huhne announces. The UK's Local Government (Miscellaneou...
Eigg Offers Itslelf As A Blueprint For UK Renewables
The Scottish west coast island of Eigg has managed to halve carbon emissions from the average household by generating more than 90 per cent of electricity from renewables. The 95 residents also save energy by heating water with solar pane...
Hebridean Energy Future Conference Highlights "The Western Isles Offer"
Comhairle nan Eilean Siar is calling on OFGEM to support an immediate 900MW electricity grid connection to the Western Isles. The call was made at the Energy Futures Conference in Stornoway today where the Leader of Comhairle nan Eilean Siar, ...
Creating Value From Waste Heat
Turboden, a Pratt & Whitney Power Systems company with 30 years of expertise and experience in the design and manufacture of Organic Rankine Cycle (ORC) power generation systems, has entered the UK market with the sale of two 1 MWe modular heat r...
US Oil Spill Shows Urgent Need For Clean Energy
As new estimates show the Gulf oil spill to be the biggest in U.S. history, and images of birds and sea turtles covered in oil begin to surface, the call to end offshore drilling in this country is growing.While images of oiled wildlife and b...

Featured Geothermal Energy company

Renenergy has been set up to help East Anglian property owners, and property professionals get the most economic and environmental value from a range of renewable technologies. Rather than focus on a single solution Renenergy takes an holistic approach to the challenge of installing renewable technologies and installs ground source and air source heat pumps and where appropriate solar thermal pane... more info »