Energy comparison: Hydroelectricity

Hello everyone,

Welcome back to another energy comparison post. Today we're talking about hydroelectricity. This is basically just using the power of moving water for our own uses. This idea has been around for thousands of years. The ancient Greeks and Romans used watermills to grind grains for making bread. Watermills were used up until the Industrial Revolution.

What is hydroelectricity?

There are three types of hydroelectric power plants. Impoundment facilities are the most common. The water is stored in a pool or reservoir normally located at a higher elevation. The dam uses gates or valves to control the water flow. When there is demand for electricity, the water is released. It falls downwards and turns turbines that turn the kinetic energy of the water (movement energy) into electric energy. Diversion facilities don't have a dam. They channel the water towards the turbines using a system of canals. Pumped-storage facilities are powered by other renewables. They pump water into an elavated pool using these renewables. When there is demand for electricity, this water is released and moves turbines to generate electricity. They basically store the power from renewables.

Advantages

Hydroelectricity is often used in rural areas as it provides affordable energy. They power hospitals, offices, schools and homes consistantly as they are not dependant on the weather as solar and wind energy are. This is similar to coal, but obvisiously coal is not renewable. Another benefit is that it can be produced pretty much anywhere that there are rivers. This means that entire countries aren't reliant on other countries just for a basic electricity supply. It is also a major employer of multiple fields from engineers and construction workers to physicists and ecologists.

Disadvantages

Dams are a major obstacle for migrating fish such as salmon. The dams also flood the river banks to create a reservoir, destroying habitats and relocating entire settlements. There is also a build up of silt in the reservoir. This slit is all the sand and minerals that flow in from the river and would normally flow out into the sea. But they can't get through the dams. Vast amounts of money have to be spent to prevent the build up of silt.

Hydroelectricity is a controversal topic and both sides of the argument are understandable. Today 71% of the world's renewable energy comes from hydropower. Globally, China produces the most hydroelectricity.

Your Green World Blog Team💚

Sources:
https://education.nationalgeographic.org/resource/hydroelectric-energy/
https://education.nationalgeographic.org/resource/hydroelectric-energy-power-running-water/
https://www.energy.gov/eere/water/benefits-hydropower

Images:

Title image: This image is owned by a blog editor.
Cheoah Dam, Tapoco, NC, owned by Warren LeMay (on flickr.com), is licensed under CC BY-SA 2.0.
Triadelphia Reservoir, owned by Ben Schumin (on flickr.com), is licensed under CC BY-SA 2.0.

Comments

Animals 36-40 in our '50 incredible animals' series

Hi, As you probably noticed, we took a break from this series, mostly due to having just too much to do. But we're back now with the last three posts. 36. The Pinocchio frog The Pinocchio frog can be found in the Foja Mountains in Indonesia. They mainly eat insects, although little is known about them. They are named because the males have a spike on their noses. They were only discovered in 2008, and this was completely by accident! It remained unnamed scientifically until over ten years later when it was given the name " Litoria pinocchio " . There is very little information about them but Wikipedia states that "the male Pinocchio frog inflates its nose when calling, and the nose decreases in size when the frog is calm and quiet," which I think is hilarious and so interesting! 37. Snub-nosed monkey Especially noticeable due to their curious looks, the snub-nosed monkeys can be found in the forests of central China and northern...

Animals 21-25 in our '50 incredible animals' series

Hi Everyone! Here are the next five animals in our current series! We hope you learn something from this. 21. Stick insect Stick insects are masters of disguise. They look like twigs or leaves. This strange appearance makes them hard to spot when stationary. Stick insects are herbivores, feeding on leaves, and can live for up to three years. Their habitat includes most tropical and subtropical regions, but there are a few species that live in temperate areas as well. There are roughly 3 000 different stick insect species! Not much more is known about them, because they are difficult to find. The two main threats to their populations are the pet trade and people killing them so as to frame their carcasses, like butterflies. Their conservation status ranges from critically endangered to least concern - so basically every category that is on the list! 22. Glass frog The glass frog is, well, see through. You can literally ...

13.12.2020 Animal Of The Week: Lark

Hello, Today's post is all about a rather interesting bird I don't know much about and so I can't wait to discover more! Habitat There are many different species of Lark so they are quite widespread. Different websites say different figures but most agree that there are between 90 and 100 different species of Lark. They live in open countryside from deserts to mountains. Their colour is adapted to their environment and so they can vary in appearance. Diet Larks are omnivorous animals and eat many species of insects as well as seeds, leaves, grasses and fruits, especially in Winter as insects are scarce. Some species will also eat snails which they break open on rocks. Lark Song The lark is reputed for its song, especially when it is in flight. This is the reason that they are sometimes represented in poetry. I love poetry and I haven't read any Lark themed poetry yet but writing this has made me want to. However, the wi...

Animals 11-15 in our '50 incredible animals' series

Hello, We have another five amazing animals for you today. Enjoy! 11. Dhole This is a dog species which looks rather like a red fox . They are difficult to put into any of the dog subfamilies. They aren't foxes, nor wolves, nor domestic dogs. Dholes are fast runners and live in packs of 5-12 individuals. Although sometimes, different packs will join forces to become a pack of 30 or more individuals! However, these super packs are broken up after a successful hunt. The different packs rarely attack each other as neighbouring packs are often closely related. Dhole packs live in burrows with multiple entrances. They can be found in eastern and southern Asia. They eat wild berries, insects and lizards and as a pack hunt deer, rodents and other wild mammals. Interestingly, unlike other dogs, they rarely kill by biting at the throat. They are also good swimmers! 12. Irrawaddy dolphin The Irrawaddy dolphin can be found in coastal areas of south a...

Metamorphosis

Hello! Today we thought it would be good to explain exactly how metamorphosis works. It's a term that we often use when talking about frogs, butterflies or other animals, but we've never actually explained what it is or how it works. What is metamorphosis? Metamorphosis is the term used to describe the changes that some animals undergo when turning into adults. It is a physical change that happens after birth/hatching. There is a brilliant quote from the website a-z animals that I just couldn't put any better: unlike the typical subtle developments in animals, metamorphosis is dramatic. It’s controlled by a release of hormones in the cells. Mammals usually move from adolescence to adulthood and old age gradually, maintaining their form and shape. However, in metamorphosis, an animal moves through those stages and changes from one form or shape to another. How does metamorphosis work? Let's take the classic butterfly example./d...

The life of ... a cicada

Hi everyone, We're back to talk about another animal. Cicadas ( Cicadoidea ) are invertebrates and are 1.9cm to 5.7cm in size. There are 3 000 species that can be divided into annual cicadas and periodical cicadas. Annual cicadas can be seen annually and are found worldwide whereas periodical cicadas only leave the ground every decade or two and are only found in North America with hotspots in the eastern and central areas of the United States. Most annual cicadas have a lifespan of about two to five years and periodical cicadas can live up to the age of 17. Female cicadas lay around 400 eggs split up over several places. They normally lay their eggs on twigs, branches or other vegetation. The eggs hatch after about six to ten weeks, now known as nymphs, and dig their way into the soil. The nymphs feed on the liquids found in plant roots. They fully develop underground, before molting their shells and coming to the surface, now fully deve...

10 Animals on the Edge of Extinction No. 10- The Javan Rhino

The Javan rhino is listed as the 1st animal on WWF’s list of the 10 world’s most endangered animals, and I for my part, had never heard of it! If you hadn’t either, we’re changing that now. A bit about the rhino’s lifestyle The Javan rhinos are now exclusively found on the island of Java in Indonesia, but were once found in vast regions of northeast india and Southeast Asia. They have a dark grey colour which looks almost black when wet, and their (often pink) skin folds look a bit like plated armor. Both males and females have lower incisors which resemble tusks that they use to fight. Males have one relatively short horn of about 25 cm (10 inches). Javan Rhinos live in tropical forests, marshy areas and in the thick bush. They are mainly browsers and eat over 100 plants species they find in the forest, weigh between 900 and 2300 kg (1984-5071 pounds) and are between 3 and 3.2 meters (10- 10.5 feet) long. How endangered are we talking? Javan rhinos are the most ...

Autumn Leaves: The science behind one of the most beautiful seasons

Hi everyone! We know that at the time this post is being published it will still be August, and the height of summer here in the Northern Hemisphere, but within the next two months or so, autumn will well and truly be upon us. So, today, we thought we could talk a bit about the science behind this beautiful season. Thinking of autumn automatically brings to mind images of crisp mornings, cosy evenings, and of the picturesque falling leaves with their hues of red, orange, yellow and gold. The change of colour of these leaves marks a change of seasons, and the decreasing temperature and light levels that goes along with that. But why do these leaves lose their greenness and fall from the trees? Trees' leaves contain a chemical called chlorophyll which allows them to convert water and carbon dioxide into glucose, or sugars, through a process called photosynthesis . This is how they gain energy from sunlight. Chlorophyll is green in colour, ...

Deforestation and why it’s a problem

Hi everyone, Welcome back to another post. Today we’ll be talking about deforestation and its impacts on our earth. Deforestation, the widespread clearance of natural forests, has been happening for thousands of years. One example is Western Europe, where, two millennia ago, 80% of the land was cloaked in dense forest cover. However, over time, a significant portion of this green expanse was sacrificed to create room for crops, livestock grazing, and as a source of fuel and building materials. Presently, a mere 34% of Western Europe retains its woodland. Today, the tropics deal with the brunt of deforestation. Activities such as mining, agriculture, road construction, and the establishment of vast cattle ranches drive the mass clearance of tropical rainforests. This results in the release of huge amounts of carbon dioxide into the atmosphere, exacerbating the global climate crisis. The consequences come in two waves: first, the reduced number of...

10 animals on the edge of extinction you didn't know about no.3- The Monarch butterfly

The monarch butterfly is an animal you will probably have seen around in your life. It's not the kind of animal you will know the name of, much less the extinction status, but the monarch butterfly is rated "endangered" on the WWF website. It's affected by climate change and humans and its numbers have declined greatly. Fast Facts The Monarch Butterfly is a rather small animal, however pretty large for one of its species. Their wingspan ranges from about 90 to 100 mm, the male butterflies being slightly larger than the female. They are orange with a black patterning and white dots on the sides of their wings, the vibrant colours warn predators of their bad taste. Monarch butterflies are known for their migration habits. They are mainly found in northern America, but travel to the south (Mexico or California mainly) to hibernate. These tiny butterflies travel almost 3 thousand kilometres and can be found all over the planet by now...

Green World

Search This Blog