RENEWABLE ENERGY SOURCES

RENEWABLE ENERGY SOURCES

Mrs.S.RENUGADEVI, M.Sc., M.Phil., B.Ed.,

ASSISTANT PROFESSOR, SRI BHARATHI ENGINEERING COLLEGE FOR WOMEN KAIKKURICHI, PUDUKKOTTAI -622303.

Abstract – Water is a critical resource for human survival and ecosystem health, yet increasing demands, population growth, and climate change pose significant challenges to its sustainable management. This abstract provides an overview of the current state of water resources, addressing the challenges faced in their management and highlighting innovative approaches for sustainable water use. The document delves into the global water crisis, discussing the imbalance between water supply and demand, water scarcity in various regions, and the detrimental impacts on ecosystems. It emphasizes the need for integrated water resources management (IWRM) to address complex interactions among water, land, and ecosystems. Innovations in water technology play a pivotal role in enhancing water use efficiency and quality. Advanced water treatment processes, smart water distribution systems, and the application of Internet of Things (IoT) technologies are explored as solutions to optimize water resource utilization and minimize wastage.

INTRODUCTION:

The abstract also addresses the importance of watershed management, emphasizing the need for conservation, restoration, and sustainable development practices. It discusses the role of green infrastructure, such as wetlands and forests, in maintaining water quality, regulating flow, and supporting biodiversity.

Overall, this abstract provides a comprehensive overview of the current state of water resources, challenges in their management, and innovative solutions. It aims to contribute to a broader understanding of the importance of sustainable water management for environmental, social, and economic well- being, urging concerted efforts towards a water-secure future.

In any discussion about climate change, renewable energy usually tops the list of changes the world can implement to stave off the worst effects of rising temperatures. That's because renewable energy sources, such as solar and wind, don't emit carbon dioxide and other greenhouse gases that contribute to global warming.

Clean energy has far more to recommend it than just being "green." The growing sector creates jobs, makes electric grids more resilient, expands energy access in developing countries, and helps lower energy bills. All of those factors have contributed to a renewable energy renaissance in recent years, with wind and solar setting new records for electricity generation.

For the past 150 years or so, humans have relied heavily on coal, oil, and other fossil fuels to power everything from light bulbs to cars to factories. Fossil fuels are embedded in nearly everything we do, and as a result, the greenhouse gases released from the burning of those fuels have reached historically high levels.

Renewable power is booming, as innovation brings down costs and starts to deliver on the promise of a clean energy future. American solar and wind generation are breaking records and being integrated into the national electricity grid without compromising reliability.

This means that renewables are increasingly displacing dirty fossil fuels in the power sector, offering the benefit of lower emissions of carbon and other types of pollution. But not all sources of energy marketed as renewable are beneficial to theenvironment. Biomass and large hydroelectric dams create difficult trade- offs when considering the impact on wildlife, climate change, and other issues. Heres what you should know about the different types of renewable energy sourcesand how you can use these emerging technologies in your own home.

• What Is Renewable Energy?

• Types of Renewable Energy Sources

• Other Alternative Energy Sources

• Renewable Energy in the Home

• What Is Renewable Energy?

Renewable energy, often referred to as clean energy, comes from natural sources or processes that are constantly replenished. For example, sunlight and wind keep shining and blowing, even if their availability depends on time and weather.

While renewable energy is often thought of as a new technology, harnessing natures power has long been used for heating, transportation, lighting, and more. Wind has powered boats to sail the seas and windmills to grind grain. The sun has provided warmth during the day and helped kindle fires to last into the evening. But over the past 500 years or so, humans increasingly turned to cheaper, dirtier energy sources, such as coal and fracked gas.

Now that we have innovative and less- expensive ways to capture and retain wind and solar energy, renewables are becoming a more important power source, accounting for more than 12 percent of U.S. energy generation. The expansion in renewables is also happening at scales large and small, from giant offshore wind farms to rooftop solar panels on homes, which can sell power back to the grid. Even entire rural communities (in Alaska, Kansas, and Missouri) are relying on renewable energy for heating and lighting.

As renewable use continues to grow, a key goal will be to modernize Americas electricity grid, making it smarter, more secure, and better integrated across regions.

Dirty or Nonrenewable energy

Nonrenewable, or dirty, energy includes fossil fuels such as oil, gas, and coal. Nonrenewable sources of energy are only available in limited amounts. When we pump gas at the station, were using a finite resource refined from crude oil thats been around since prehistoric times.

Nonrenewable energy sources are also typically found in specific parts of the world, making them more plentiful in some nations than others. By contrast, every country has access to sunshine and wind. Prioritizing renewable energy can also improve national security by reducing a countrys reliance on exports from fossil fuelrich nations.

Many nonrenewable energy sources can endanger the environment or human health. For example, oil drilling might require strip- mining Canadas boreal forest; the technology associated with fracking can cause earthquakes and water pollution; and coal power plants foul the air. To top it off, all of these activities contribute to global warming.

Types of Renewable Energy Sources

SOLAR ENERGY

Humans have been harnessing solar energy for thousands of yearsto grow crops, stay warm, and dry foods. According to the National Renewable Energy Laboratory, more energy from the sun falls on the earth in one hour than is used by everyone in the world in one year. Today, we use the suns rays in many waysto heat homes and businesses, to warm water, and to power devices.

Solar panels on the rooftops of East Austin, Texas Solar, or photovoltaic (PV), cells are made from silicon or other materials that transform sunlight directly into electricity. Distributed solar systems generate electricity locally for homes and businesses, either through rooftop panels or community projects that power entire neighborhoods. Solar farms can generate enough power for thousands of homes, using mirrors to concentrate sunlight across acres of solar cells.

Floating solar farms or floatovoltaics can be an effective use of wastewater facilities and bodies of water that arent ecologically sensitive. Solar supplies nearly 3 percent of U.S. electricity generation (some sources estimate it will reach nearly 4 percent in 2022). But 46 percent of all new generating capacity came from solar in 2021.

Solar enrgy systems dont produce air pollutants or greenhouse gases, and as long as they are responsibly sited, most solar panels have few environmental impacts beyond the manufacturing process.

WIND ENERGY

Weve come a long way from old-fashioned windmills. Today, turbines as tall as skyscrapers with turbines nearly as wide in diameterstand at attention around the world. Wind energy turns a turbines blades, which feeds an electric generator and produces electricity.

Wind which accounts for 9.2 percent of

U.S. electricity generation, has become one of the cheapest energy sources in the country. Top wind power states include California, Iowa, Kansas, Oklahoma, and Texas, though turbines can be placed anywhere with high wind speedssuch as hilltops and open plainsor even offshore in open water.

HYDROELECTRIC POWER

Hydropower is the largest renewable energy source for electricity in the United States, though wind energy is soon expected to take over the lead. Hydropower relies on watertypically fast-moving water in a large river or rapidly descending water from a high pointand converts the force of that water into electricity by spinning a generators turbine blades.

Nationally and internationally, large hydroelectric plantsor mega-damsare often considered to be nonrenewable energy. Mega-dams divert and reduce natural flows, restricting access for animal and human populations that rely on those rivers. Small hydroelectric plants (an installed capacity below about 40 megawatts), carefully managed, do not tend to cause as much environmental damage, as they divert only a fraction of the flow.

BIOMASS ENERGY

Biomass is organic material that comes from plants and animals, and includes crops, waste wood, and trees. When biomass is burned, the chemical energy is released as heat and can generate electricity with a steam turbine.

Biomass is often mistakenly described as a clean, renewable fuel and a greener alternative to coal and other fossil fuels for producing electricity. However, recent science shows that many forms of biomassespecially from forests produce higher carbon emissions than fossil fuels. There are also negative consequences for biodiversity. Still, some forms of biomass energy could serve as a low-carbon option under the right circumstances. For example, sawdust and chips from sawmills that would otherwise quickly decompose and release carbon can be a low-carbon energy source.

GEOTHERMAL ENERGY

The Svartsengi geothermal power plant near Grindavík, Iceland

If youve ever relaxed in a hot spring, youve used geothermal energy. The earths core is about as hot as the suns surface, due to the slow decay of radioactive particles in rocks at the center of the planet. Drilling deep wells brings very hot underground water to the surface as a hydrothermal resource, which is then pumped through a turbine to create electricity. Geothermal plants typically have low emissions if they pump the steam and water they use back into the reservoir. There are ways to create geothermal plants where there are not underground reservoirs, but there are concerns that they may increase the risk of an earthquake in areas already considered geological hot spots.

OCEAN

Tidal and wave energy are still in the developmental phase, but the ocean will always be ruled by the moons gravity, which makes harnessing its power an attractive option. Some tidal energy approaches may harm wildlife, such as tidal barrages, which work much like dams and are located in an ocean bay or lagoon. Like tidal power, wave power relies on dam-like structures or ocean flooranchored devices on or just below the waters surface.

Renewable Energy in the Home Solar power

At a smaller scale, we can harness the suns rays to power the whole housewhether through PV cell panels or passive solar home design. Passive solar homes are designed to welcome in the sun through south-facing windows and then retain the warmth through concrete, bricks, tiles, and other materials that store heat.

Some solar-powered homes generate more than enough electricity, allowing the homeowner to sell excess power back to the grid.

Batteries are also an economically attractive way to store excess solar energy so that it can be used at night. Scientists are hard at work on new advances that blend form and function, such as solar windows and roof shingles.

Geothermal heat pumps

Geothermal technology is a new take on a recognizable processthe coils at the back of your fridge are a mini heat pump, removing heat from the interior to keep foods fresh and cool. In a home, geothermal or geoexchange pumps use the constant temperature of the earth (a few feet below the surface) to cool homes in summer and warm houses in winterand even to heat water.

Geothermal systems can be initially expensive to install but typically pay off within 5 to 10 years. They are also quieter, have fewer maintenance issues, and last longer than traditional air conditioners.

Small wind systems

A backyard wind farm? Boats, ranchers, and even cell phone companies use small wind turbines regularly. Dealers now help site, install, and maintain wind turbines for homeowners, tooalthough some DIY enthusiasts are installing turbines themselves. Depending on your electricity needs, wind speeds, and zoning rules in your area, a wind turbine may reduce your reliance on the electrical grid.

Selling the energy you collect

Wind- and solar-powered homes can either stand alone or get connected to the larger electrical grid, as supplied by their power provider. Electric utilities in most states allow homeowners to only pay the difference between the grid-supplied electricity consumed and what they have produceda process called net metering.

If you make more electricity than you use, your provider may pay you the retail price for that power.

Renewable energy and you

Advocating for renewables, or using them in your home, can accelerate the transition toward a clean energy future. Even if youre not yet able to install solar panels, you may be able to opt for electricity from a clean energy source. (Contact your power company to ask if it offers that choice.) If renewable energy isnt available through your utility, you can purchase renewable energy certificates to offset your use.

CONCLUSION

Renewable energy sources represent a critical and sustainable solution to the global energy challenge. As the world grapples with the escalating threats of climate change, dwindling fossil fuel reserves, and the need for energy security, the transition to renewable energy has become more imperative than ever. The benefits of renewable energy, including environmental preservation, reduced greenhouse gas emissions, and increased energy independence, underscore its significance in shaping a cleaner and more resilient future.

Moreover, the rapid advancements in renewable technologies, coupled with decreasing costs, have made these sources increasingly accessible and economically viable. The deployment of solar, wind, hydro, and other renewable technologies not only mitigates the adverse impacts of conventional energy sources but also opens up new avenues for innovation, job creation, and sustainable development.

Governments, businesses, and individuals must collectively embrace and invest in renewable energy initiatives to accelerate the transition to a low-carbon and sustainable energy landscape. It is essential to foster international collaboration, implement supportive policies, and prioritize research and development to overcome challenges and unlock the full potential of renewable energy sources.

In essence, the widespread adoption of renewable energy sources is not just a necessity but a transformative opportunity. By harnessing the power of nature responsibly, we can build a cleaner, greener, and more resilient world for generations to come.

REFERENCE

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