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Renewable Energy Systems – An Overview


The term Renewable Energy Systems refers to energy sources that do not necessarily get exhausted or depleted due to over-utilization with time by human activities. The main sources of renewable energies are the sun, the wind, water (hydropower), ocean systems as tide, geothermal hot fluids and biomasses. The main features of Renewable Energy Systems are:

  • ​unlike fossil fuels, Renewable Energy Systems do not pollute the environment with increase in greenhouse gases like CO2​. Greenhouse gasses are believed to be the main contributors to global warming. Sources of the polluting carbon dioxide are the burning of fossil fuels for power generation, the transportation sector, farming, industrial and other human activities.
  • ​unlike fossil fuels, renewable energy Systems are free and available everywhere. The challenge is always how to harness and control its application in a sustainable manner for human use. State of the art technologies are now available to harness renewable energies.

Types of renewable energy Systems

    • Solar energy– the electricity-generating unit is the Photo voltaic (PV) panels, which are made of semiconducting material like silicon.

      Solar Panels

As the photons of the sunlight hits the semiconducting material, electrons get excited and disengage from the atoms of the panels, causing a flow of electrons, which is basically electricity.

Wind Turbine

Wind energy – wind energy uses wind turbines to generate electricity. Wind turbines work in opposite manner to fans. Fans utilize electricity to boost fluid pressures, and create “wind” in the process. While, Wind turbines generate electricity using the wind to rotate a generators that produces electricity.


  • Geothermal energy – is thermal energy contained within the earth’s crust. It is contained in hot reservoirs that can erupt as volcanoes spewing out lava and hot gases,  or sometimes tapped from the surface of the earth to supply thermal energy.Huge fissures open near Kilauea crater

Kilauea Hawaii Volcanic Eruption in 2018

It can be utilized in a variety of ways. Geothermal power plants are common in areas where sustainable and stable geothermal energy is available close to the earth’s surface.

  • Hydropower energy – water pressure can be used to turn turbines, which in turn turns generators that produce electricity. That is the principle of hydro power energy. Water pressure (forces) can be enhanced with increased head (elevations).

Water Wheel

In typical hydro power industrial installation the water is captured and collected behind dams that provide both “elevation” and “large volumes”. The water is then passed through turbines, in a controlled manner, to drive generators that produce electricity.   







  • Biomass energy– energy derived from the combustion of wood and other carbon-based compounds found in the environment.

The renewable energy systems form very large area that cannot possibly be covered by one niche area. As we develop the web site(s), we will explore how best we can address the subject matter.