Tag Archives: Green Energy

What is Geothermal Energy?

Geothermal Energy is generated and stored in the earth, under the soil. It is earth heat converted to energy. This kind of energy has been used since ancient Roman times from hot springs, and as other environmental friendly energy sources it is nothing new, but just modernized. Geothermal power is cost effective, reliable, sustainable and environmentally friendly. This alternative suits well for all types of energy consuming areas as industry, greenhouses and homes.

Geothermal sources under the soil releases greenhouse gases, but the emissions are much lower that fossil fuels and is a good alternative to replace usage of fossil fuels. This energy alternative can easily cover all of the humanitys needs. It is an energy source that will grow significantly the coming years as the investment costs has reduced and people has showed interest to pay more for renewable energy.

etna_lava_zoom   surface_geothermal_spring

Two sources for geothermal energy are magma and hot water springs

Thermal energy plants was before built only where high temperatures were to be found close to the surface, but thanks to developed technology as e.g. better drilling equipment, the areas are today wide spread. Thermal energy today is converted from hot waters to magma. Almost anywhere the temprature three meters under the soil is between 10-16 °C (50-60 °F) and this is enough to install a heat pump.


Nesjavellir Geothermical Power Station in Iceland

Green Energy: Tidal

Tidal Power or Tidal Energy is an old upcoming energy form, still unknown for global market, but one of the oldest forms of energy used by humans, and is also more predictable than sun and wind energy. It is the future generations energysolution. Tidal energy has not been in much use because it is a new upcoming technology, still has high costs and needs time to find sites with sufficiently high tidal ranges or flow velocities.

Tidal power is reliable and non-polluting as it does not cause emission of gases or use fossil fuel generated electricity, and decreases the need for nuclear power. The system is like windturbines but undersea turbines, driven by the sea instead of the wind (see photo below). Unlike wind and waves, tidal currents are entirely predictable.  Tidal energy can be used:

* By building semi-permeable barrages across estuaries with a high tidal range

* By harnessing offshore tidal streams as electricity can be generated by water flowing both into and out of a bay.

Atleast a seven metres tidal range is required for economical operation and for water suffency. It is extremely important to choose right location for tidal energy as it can disturb aquatic and shoreline ecosystems, as well as navigation and recreation.

Underwater-Tidal-PowerPhoto credit: trackenergy.com.au

Historically, tide mills have been used, both in Europe and on the Atlantic coast of North America. The incoming water was contained in large storage ponds, and as the tide went out, it turned waterwheels that used the mechanical power it produced to mill grain.The earliest occurrences date from Roman Times. It was only in 1800 that the process of using falling water and spinning turbines to create electricity was introduced in the U.S. and Europe (Source: Wikipedia).

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