VARIOUS FREE RENEWABLE ENERGY

----- Renewable energy----

is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat. Renewable energy often provides energy in four important areas: electricity generation, air and water heating/cooling, transportation, and rural (off-grid) energy services.

The following source of renewable energy ;

Renewable energy resources and significant opportunities for
energy efficiency exist over wide geographical areas, in contrast to other energy sources, which are concentrated in a limited number of countries. Rapid deployment of renewable energy and energy efficiency, and technological diversification of energy sources, would result in significant energy security and economic benefits.It would also reduce environmental pollution such as air pollution caused by burning of fossil fuels and improve public health, reduce premature mortalities due to pollution and save associated health costs that amount to several hundred billion dollars annually only in the United States. Renewable energy sources, that derive their energy from the sun, either directly or indirectly, such as hydro and wind, are expected to be capable of supplying humanity energy for almost another 1 billion years, at which point the predicted increase in heat from the sun is expected to make the surface of the earth too hot for liquid water to exist.

TODAY'S IMPACT USING RENEWABLE SOURCE

-All energy sources have some impact on our environment. Fossil fuels—coal, oil, and natural gas—do substantially more harm than renewable energy sources by most measures, including air and water pollution, damage to public health, wildlife and habitat loss, water use, land use, and global warming emissions.

However, renewable sources such as wind, solar, geothermal, biomass, and hydropower also have environmental impacts, some of which are significant.

The exact type and intensity of environmental impacts varies depending on the specific technology used, the geographic location, and a number of other factors. By understanding the current and potential environmental issues associated with each renewable energy source, we can takes steps to effectively avoid or minimize these impacts as they become a larger portion of our electric supply.

BENEFITS USING RENEWABLE ENERGY

Less global warming

Human activity is overloading our atmosphere with carbon dioxide and other global warming emissions. These gases act like a blanket, trapping heat. The result is a web of significant and harmful impacts, from stronger, more frequent storms, to drought, sea level rise, and extinction.

Improved public health

The air and water pollution emitted by coal and natural gas plants is linked with breathing problems, neurological damage, heart attacks, cancer, premature death, and a host of other serious problems. The pollution affects everyone.

Most of these negative health impacts come from air and water pollution that clean energy technologies simply don’t produce. Wind, solar, and hydroelectric systems generate electricity with no associated air pollution emissions. Geothermal and biomass systems emit some air pollutants, though total air emissions are generally much lower than those of coal- and natural gas-fired power plants.

In addition, wind and solar energy require essentially no water to operate and thus do not pollute water resources or strain supplies by competing with agriculture, drinking water, or other important water needs. In contrast, fossil fuels can have a significant impact on water resources: both coal mining and natural gas drilling can pollute sources of drinking water, and all thermal power plants, including those powered by coal, gas, and oil, withdraw and consume water for cooling.

Biomass and geothermal power plants, like coal- and natural gas-fired power plants, may require water for cooling. Hydroelectric power plants can disrupt river ecosystems both upstream and downstream from the dam. However, NREL's 80-percent-by-2050 renewable energy study, which included biomass and geothermal, found that total water consumption and withdrawal would decrease significantly in a future with high renewables .

Inexhaustible energy

Strong winds, sunny skies, abundant plant matter, heat from the earth, and fast-moving water can each provide a vast and constantly replenished supply of energy. A relatively small fraction of US electricity currently comes from these sources, but that could change: studies have repeatedly shown that renewable energy can provide a significant share of future electricity needs, even after accounting for potential constraints .

Jobs and other economic benefits

Two energy workers installing solar panels.

Compared with fossil fuel technologies, which are typically mechanized and capital intensive, the renewable energy industry is more labor intensive. Solar panels need humans to install them; wind farms need technicians for maintenance.

Stable energy prices

Renewable energy is providing affordable electricity across the country right now, and can help stabilize energy prices in the future.

Although renewable facilities require upfront investments to build, they can then operate at very low cost (for most clean energy technologies, the “fuel” is free). As a result, renewable energy prices can be very stable over time.

Reliability and resilience

Wind and solar are less prone to large-scale failure because they are distributed and modular. Distributed systems are spread out over a large geographical area, so a severe weather event in one location will not cut off power to an entire region. Modular systems are composed of numerous individual wind turbines or solar arrays. Even if some of the equipment in the system is damaged, the rest can typically continue to operate.

What is the most promising renewable sources ?

For years, there has been a push to find alternative energy sources that will replace the use of fossil fuels. However, there really has not been a lot of movement towards making the replacement permanently on a large scale. Yes, many smaller entities and even households are doing a great job relying on renewable energy sources, but as a whole, the United States has not made much progress and fossil fuels are still very much the energy source of choice.

We all know one day these fossil fuels will run out. At that time, we will have no choice but to find alternatives or our way of life will completely change. Luckily, there has been a lot of work on renewable energy sources. There are many systems in place that are being tested and refined to help create something that would work on a large scale.

Still, renewable energy has been slow going. This is mostly due to the limitations. Regardless of which type of renewable energy you are talking about, it has limitations. It does not have the same reliability or even accessibility as fossil fuels, which is probably why we haven’t made a serious move to use renewable energy over fossil fuels. Looking towards the future, though, there are two renewable energy sources that seem to stand out as the most likely to take the place of fossil fuels. These are solar energy and hydropower.

------REFERENCES------

https://en.wikipedia.org/wiki/Renewable_resource

https://www.eia.gov/energyexplained/index.cfm?page=solar_home

https://eco-officegals.com/

https://www.ucsusa.org/clean-energy/renewable-energy/public-benefits-of-renewable-power#.Wmt4fPmWaM8

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