The definition of renewable energy source is 'energy that is sustainable – something that can't run out or is endless, like the sun'. When you hear the term 'alternative energy', it's usually referring to renewable energy sources too, but there are other energy sources that are considered alternative. Renewable energy means energy that's different to the most commonly used non-sustainable sources – like coal.
Sunlight is one of our planet’s most abundant and freely available energy resources. The amount of solar energy that reaches the earth’s surface in one hour is more than the planet’s total energy requirements for a whole year. Although it sounds like a perfect renewable energy source, the amount of solar energy we can use varies according to the time of day and the season of the year as well as geographical location. In the UK, solar energy is an increasingly popular way to supplement your energy usage. Find out if it’s right for you below by reading our guide to solar power.
Wind is a plentiful source of clean energy. Wind farms are an increasingly familiar sight in the UK with wind power making an ever-increasing contribution to the National Grid. To harness electricity from wind energy, turbines are used to drive generators which then feed electricity into the National Grid. Although domestic or ‘off-grid’ generation systems are available, not every property is suitable for a domestic wind turbine. Discover the power of wind energy today! Our renewables site is a great resource for learning more about how wind energy is an important part of the energy mix in the UK.
As a renewable energy resource, hydro power is one of the most commercially developed. By building a dam or barrier, a large reservoir can be used to create a controlled flow of water that will drive a turbine, generating electricity. This energy source can often be more reliable than solar or wind power (especially if it's tidal rather than river) and also allows electricity to be stored for use when demand reaches a peak. Like wind energy, in certain situations hydro can be more viable as a commercial energy source (dependent on type and compared to other sources of energy) but depending very much on the type of property, it can be used for domestic, ‘off-grid’ generation.
This is another form of hydro energy that uses twice-daily tidal currents to drive turbine generators. Although tidal flow unlike some other hydro energy sources isn’t constant, it is highly predictable and can therefore compensate for the periods when the tide current is low.
By harnessing the natural heat below the earth’s surface, geothermal energy can be used to heat homes directly or to generate electricity. Although it harnesses power directly below our feet, geothermal energy is of negligible importance in the UK compared to countries such as Iceland, where geothermal heat is much more freely available.
This is the conversion of solid fuel made from plant materials into electricity. Although fundamentally, biomass involves burning organic materials to produce electricity, and nowadays this is a much cleaner, more energy-efficient process. By converting agricultural, industrial and domestic waste into solid, liquid and gas fuel, biomass generates power at a much lower economical and environmental cost.
Fossil fuels are not a renewable source of energy because they are not infinite. Plus, they release carbon dioxide into our atmosphere which contributes to climate change and global warming.
Burning wood instead of coal is slightly better but it’s complex. On the one hand, wood is a renewable resource – provided it comes from sustainably managed forests. Wood pellets and compressed briquettes are made from by-products of the wood processing industry and so arguably it’s recycling waste.
Compressed biomass fuels produce more energy than logs too. On the other hand, burning wood (whether it be raw timber or processed waste) releases particles into our atmosphere.
As world population rises, so does the demand for energy in order to power our homes, businesses and communities. Innovation and expansion of renewable sources of energy is key to maintaining a sustainable level of energy and protect our planet from climate change.
Renewable energy sources make up 26% of the world’s electricity today, but according to the International Energy Agency (IEA) its share is expected to reach 30% by 2024. “This is a pivotal time for renewable energy,” said the IEA’s executive director, Fatih Birol.
In 2020, the UK hit a new amazing renewable energy milestone. On Wednesday 10th June, the country celebrated two months of running purely on renewable energy for the first time ever. This is a great step in the right direction for renewables.(1)
In the future, it’s expected that the number of renewable energy sources will continue to increase as we see an increase in demand for power. This will drive down the price of renewables – great for the planet, and great for our wallets.
Nuclear energy isn't renewable but it's low-carbon, which means its generation emits low levels of CO2, just like with the above renewable energy sources. Nuclear energy has a stable source, which means it's not dependent on the weather and will play a big part in getting Britain to Net Zero status.
All our fixed home tariffs are backed by zero-carbon electricity as standard and are backed annually. You could play your part in achieving the Net Zero target now by switching to one of our fixed electricity tariffs.
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The advantages of using renewable energy in your home are persuasive:
Cut your electricity bills: Once you’ve paid for the costs of installing a renewable energy system, you can become less reliant on the National Grid and your energy bills can be reduced. Customers who install solar panels and batteries benefit from being less reliant on the grid, can make savings of up to £525 a year as well as earn for any energy that's exported to the grid through our Smart Export Tariff.
Reduce your carbon footprint: Green, renewable sources of energy don’t release carbon dioxide or other harmful pollutants into the atmosphere. According to the Energy Saving Trust's Solar panels page, a typical solar PV system could save around 1.5 - 2 tonnes of carbon per year. You can find out more in our solar panels guide.
EDF Renewables is the part of our business that’s entirely dedicated to generating renewable energy through wind farms and battery storage. EDF Renewables.
Wondering what new and innovative ways scientists are looking at in order to reduce our dependence on traditional fossil fuels? Some of these innovations might surprise you: Alternative energy sources you probably haven’t heard of.
See also:Solar PV could account for 5% of global demand by 2020 and up to 9% by 2030
By the year 2050, our energy needs can be met by 95% renewable energy
Price Waterhouse Cooper predicts that Africa could run on 100% renewable energy by 2050
Over the last four decades, the price of solar PV panels has declined 99%
A US study showed that renewable energy creates three times more jobs than fossil fuels
Investment in renewable energy has surpassed fossil fuel investment. The global renewable energy market is now worth over $250 billion
Find out what it's like working in renewable energy.
Find out what green energy tariffs are and how to know the difference between real green tariffs and 'green washed' ones.
Would you like to reduce your carbon emissions at home? Read our easy and free tips.
Read our guide for students on how to manage your bills with your housemates.
When it comes to powering the world we live in, there are countless ways to generate energy: some are simple to generate but damage the environment while others are easy to generate but expensive to maintain. When we’re dealing with renewable energy sources, the main goals are to offset the release of CO2, save money, and supply energy efficiently.
It’s easy to assume that because they’re better for the environment, renewable sources of energy are also more efficient, but that may not always be the case. Here, we’ll explore some of the many renewable energy sources and how efficient they are.
When it comes to energy efficiency, renewable energy is generally more efficient than non-renewable energy. The energy we get from wind, the sun, and hydro turbines can be reused without relying on an exhaustible or finite element.
We then have to factor in the product after the electricity has been produced. Non-renewable energy sources result in the waste of coal or natural gas. This requires additional energy and environmental mitigation. For this reason, the efficiency of usable energy for the least efficient source of energy — coal — comes in at a meager 29% of its original energy value. Wind, on the other hand, provides an impressive 1,164% of its original input of energy!
Scientists and environmentalists are hopeful that more environmentally friendly energy options will continue to be developed. The hope is that in time we will not need to rely on fossil fuels.
It is generally believed that wind is the most efficient way to harness renewable energy. Because windmills can be placed in open areas also used for farming, they offer flexibility. Generally, rows of wind turbines are constructed along coastal areas where nothing can hinder the flow of wind. It is estimated that this industry could make up as much as 35% of US electrical production in 20 years’ time.
As well as being able to physically fit the infrastructure into areas on land and sea, wind energy is drought-proof. The manufacturing and distribution of wind turbine parts have no relationship with water itself, and, once built, wind turbines do not require any fuel to function. In drought-prone or low-income areas, this is vital as a row of wind turbines could make the difference between free, sustainable energy and expensive, non-renewable energy.
When it comes to the top five most efficient energy sources available, geothermal energy, hydroelectricity, nuclear, and solar power come after wind power.
The least efficient renewable energy source is solar thermal energy. This is different from the solar power we normally think of that converts the sun’s rays into energy. Solar thermal energy uses the sun’s heat to create steam, which then turns a turbine to generate electricity. It requires the use of water (in the form of steam), so is much less efficient than other forms of renewable energy.
This depends on the specific energy source we look at, and when and where in the world it is being used. For example, solar power can be extremely efficient in certain parts of the US, particularly the areas that are exposed to long daylight hours with intense heat levels. As you’d expect, solar panels are also at their most effective during the summer months. But in countries such as Norway and Iceland, which may experience as few as two daily hours of daylight during certain times of the year, solar panels may not be the most efficient energy source.
And when it comes to countries that are landlocked, they do not have the option of setting up offshore wind turbines, and certain countries are not yet developed enough to afford solar panels and geothermal energy plants.
On the whole, though, renewable energy is far more efficient due to the simple fact that it doesn’t have to be extracted from the earth and transported elsewhere for use. We all know that much of the world has relied on the Middle East for oil for decades, and that oil has to be transported (hence why we experience oil spills that damage entire ecosystems). Clearly, that is much less efficient way of creating energy than solar panels.
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