Non Renewable Energy Sources

Believe it or not, plants and animals from millions of years ago are now being used to power our lights, fuel our cars, and heat our homes today. These are called fossil fuels and are one of the most common types of non-renewable energy sources. Non-renewable energy sources have been used by humans for centuries and are critical to understanding how our modern world functions.

Non-renewable energy sources definition

Non-renewable energy sources are usually dug up from the ground and are in limited supply. In contrast to renewable energy sources, every time non-renewable energy sources are used, we have less and less of them.

Examples of non-renewable energy sources

Let's take a look at the different examples of non-renewable energy sources.

Coal

Coal is a rock typically found deep in the earth made from natural materials that have been pressed together over millions of years. Because coal is from ancient living things, it’s what we call a fossil fuel. Coal is then burned for its energy which can be used to heat things like ovens, but that’s rarely done anymore. Most commonly, coal is burned in power plants to heat water into steam, which then turn machines called turbines which generate electricity.

Natural gas

Like coal, natural gas is also a fossil fuel, except in a gas form instead of a solid one. Natural gas has no colour or smell, but many places add a scent to it so it can more easily be detected. Being highly flammable, natural gas is used in several ways to harness its energy. Firstly, the heat it makes can be used directly to heat buildings and water. You may have also used a gas stove before to cook. Secondly, power plants can use natural gas to generate electricity as well. Finally, natural gas can actually be concentrated or turned into a liquid and used to power vehicles like cars and boats.

Fig. 1 - a stove burner using natural gas

Oil

Oil, also known as petroleum, is a liquid taken from the ground and is a fossil fuel. Oil in its raw, natural form is rarely used and has to be turned into something else to be most beneficial. Petrol, diesel, and jet fuel are all examples of products made from oil and are used to power everything from cars to planes and trains.

Nuclear

Unique from the other examples of non-renewable energy sources we’ve discussed, nuclear energy is not a fossil fuel. Nuclear power takes the energy from nuclear reactions, which are when very tiny particles collide or break down. These reactions create heat used to generate electricity.

Fig. 2 - While it looks like smoke, nuclear power plants mostly just emit steam

Advantages of non-renewable energy sources

Non-renewable energy sources get a lot of (deserved) bad press. However, there are many advantages to using non-renewable energy sources.

Cost

Of course, everything costs money and non-renewable energy sources are no exception to that. However, a lot of the cost advantages of non-renewable energy sources are in comparison to renewable energy sources. For most of the twentieth century, the emphasis was put on building up non-renewable energy, and there is an already existing supply of coal plants, nuclear plants, and natural gas plants that are currently working. With this in mind, it's easy to see why investing money into renewable energy can seem unappetizing when there are existing non-renewable power plants and the infrastructure to support it already in place. So, for the most part, using non-renewable energy is a cost-effective solution for many.

Dependability

Since non-renewable energy sources are not impacted by factors like the wind and sun, they can function whenever energy is in demand by the people. Additionally, they are able to increase or decrease power production depending on how much is actually needed, meaning less electricity gets wasted.

Limitations of non-renewable energy sources

Let's take a look at the limitations of non-renewable energy sources:

Limited supply

There’s no avoiding the simple fact that non-renewable energy sources are limited. Eventually, a point will come where there aren’t enough resources available, or it becomes too costly to get what remains in the ground or below the sea floor. With the global population increasing and demand for energy always going up, the amount of coal, oil, natural gas, and radioactive materials we have available will get used up more quickly.

Impacted by geopolitics

The global supply of non-renewable energy sources is not evenly distributed. Some countries control more and some less. Political disagreements can lead nations to use their access to certain energy resources as a tool and restrict supplies to other countries.

Environmental impact of non-renewable energy sources

Perhaps one of the biggest drawbacks to non-renewable energy sources is their impact on the environment.

Pollution

The burning of fossil fuels creates large amounts of pollution, harming the health of humans and the environment. Some dirtier forms of coal are particularly bad, releasing tiny particles and chemicals into the air, poisoning the water and leading to lung issues in humans. Vehicles burning diesel and petrol are much the same, reducing the air quality in cities particularly. Nuclear power plants produce radioactive waste that is dangerous to humans and the environment if not safely stored.

Fig. 3 - The burning of fossil fuels produces harmful pollutants

Greenhouse gas emissions

The burning of fossil fuels releases greenhouse gasses, which are the driving force behind climate change. With the threat of climate change and its devastating effects looming larger and larger, it’s essential to shift away from non-renewable energy sources like fossil fuels. Coal power plants alone are responsible for roughly a fifth of the world’s greenhouse gas emissions.¹ It’s important to note, however, that nuclear energy, while being non-renewable, does not emit greenhouse gasses.

Habitat destruction

The digging up of coal from the ground, building large power plants, and storing nuclear waste are all ways in which non-renewable energy sources can disrupt where plants and animals live. These disturbances to natural habitats lead to animal and plant species dying out and the ecosystems becoming even more fragile.

Difference between renewable and non-renewable energy sources

The primary difference between renewable and non-renewable energy sources is that renewable sources are unlimited while non-renewable sources can run out. Renewable energy sources use things that are limitless, like the sun and wind to generate electricity. See our article on Renewable Energy Sources to learn more!