The definition of renewable energy is dependent on the term renewable. An energy source that naturally replenishes is considered renewable. Unlike fossil fuels which take millions of years to form, wind, rain, water and sunlight are self contained and naturally replenishing, thus renewable.
Many people think solar energy, the most popular form of renewable energy, is a new concept. The truth is solar panels were used as far back as the 1920s to heat water in lieu of more expensive electrical heating systems.
Renewable Energy Past to Present
When fossil fuels were unearthed, much of the previous solar energy use was abandoned for the cheaper, more reliable fossil fuels. As these fuels began to have an impact on the environment and their levels diminished, a resurgence of the renewable energy sources occurred.
Today, wind farms, solar electrical plants and solar thermal plants are used to power entire towns and cities.
Alternative energy communities are also popping up throughout the world with Canada being the first country to boast of an entire community based on solar energy. Technology is constantly changing and the future definition of renewable energy is also changing.
The Future of Renewable Energy
Everything that moves creates energy. This fact applies to wind, water and sunlight which are the most commonly used renewable energy sources. However, the movement of man is also being viewed as a source of renewable energy.
Speed bumps that harvest kinetic energy are one concept currently being tested by New Energy Technologies. The
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