Goodbye, Fossil Fuels

Hello, Alternative Energy Systems

What are alternative energy systems?  They are the varied forms of power generation (geothermal, wood fuel/biomass, wind and photovoltaic) that provide sustainable alternatives to fossil fuels.  These days, understanding our alternatives for energy generation is more practical than ever as our global demands for energy threaten to deplete our fossil fuel reserves over the coming decades.  Further, alternative energy systems often provide power with little or no effect on the environment.  Here are some of the alternative energy systems many are turning to as sources of power:

Geothermal energy is generated from heat in the Earth, such as geothermal hot water springs at the surface of the Earth or just below it and the molten heat layers of magma hundreds of feet deep.  Geothermal power is a clean and sustainable resource.  It can be used to heat buildings and to power hot water heaters via geothermal heat pumps and ductwork.  Geothermal power plants tap into reservoirs of hot water, manmade or natural, in the Earth to use steam powered turbines which generate energy or heat a fluid that, when vaporized, turns an energy producing turbine.

Low emission wood or biomass energy. As a renewable resource that is sustainable and dependable, wood fuel (also known as a biomass energy source) has more advantages than fossil fuels.  It emits 90% less carbon dioxide than fossil fuels and scant sulfur and heavy metals; wood fuel does not contribute to acid rain pollution and the particle emissions can be controlled.  Increasingly state governments and home owners are looking to biomass energy as an affordable future energy source provided that wood fuel can be sourced within 50 miles.  The main down sides to using wood fuels are the start-up costs for implementing this energy system and the upkeep (removal of ash waste, etc). One study points out that it is 90% cheaper in Wisconsin to heat a home with wood pellets than it is to heat it with electricity so the lower cost and efficiency of biomass energy must be weighed against the initial installation costs and upkeep.

Wind energy. Sails, windmills, wind pumps and wind turbines all harness energy from the wind which, of course, is a renewable and clean energy source.  Wind is the energy source that has the greatest capacity in terms of accommodating human energy use and wind farm construction continues to increase worldwide at a rate of 27% a year with China leading the way with more than half of the world’s new wind installations.  The most common extraction of this kind of energy is through wind farms consisting of many wind turbines designed to generate electricity.  Wind farms can be located off shore (for greater wind capacity) or on agricultural land where crops can be grown all the way up to the base of the turbine. Since wind is virtually an inexhaustible resource (although sometimes inconsistent), this is one instance in which the energy source far outstrips the capacity for humans to use it.

Lillgrund Wind Farm off the coast of Sweden(75226)Credit: http://en.wikipedia.org/wiki/File:Sund_mpazdziora.JPG

Photovoltaic energy is another term for solar cell energy.  Solar cells extract energy from sunlight.  This is the form of energy that can be found in watches and batteries (for example) as well as home electricity systems and communication grids.  It is a clean energy source as it requires no bulky mechanisms to operate, the photovoltaic arrays (that house the solar cells) come in all sizes and can be installed quickly and it generates no waste by-products.

For the sake of brevity, I omitted other alternative energy systems although they, like the ones listed above, are clean, renewable and sustainable forms of energy.  While some of these may seem new now, as the world looks to wean itself from fossil fuels, we will hear more about and use alternative energy systems.

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